Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
Comment: | Added files for building Linq module. |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
9c7e81cdb4d20f22b5f14a27f5c90e83 |
User & Date: | shaneh 2011-04-07 15:12:03.981 |
Context
2011-04-07
| ||
15:53 | Missing file for designer. check-in: dc92d38c29 user: shaneh tags: trunk | |
15:12 | Added files for building Linq module. check-in: 9c7e81cdb4 user: shaneh tags: trunk | |
2011-04-06
| ||
02:06 | added files for install project; check-in: f0d5e38f0b user: shaneh tags: trunk | |
Changes
Added System.Data.SQLite.Linq/SQL Generation/DmlSqlGenerator.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 | //--------------------------------------------------------------------- // <copyright file="DmlSqlGenerator.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.IO; using System.Text; using System.Data; using System.Data.Common; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; using System.Data.Common.Utils; using System.Data.Mapping.Update.Internal; /// <summary> /// Class generating SQL for a DML command tree. /// </summary> internal static class DmlSqlGenerator { private static readonly int s_commandTextBuilderInitialCapacity = 256; internal static string GenerateUpdateSql(DbUpdateCommandTree tree, out List<DbParameter> parameters) { StringBuilder commandText = new StringBuilder(s_commandTextBuilderInitialCapacity); ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, null != tree.Returning, "UpdateFunction"); // update [schemaName].[tableName] commandText.Append("UPDATE "); tree.Target.Expression.Accept(translator); commandText.AppendLine(); // set c1 = ..., c2 = ..., ... bool first = true; commandText.Append("SET "); foreach (DbSetClause setClause in tree.SetClauses) { if (first) { first = false; } else { commandText.Append(", "); } setClause.Property.Accept(translator); commandText.Append(" = "); setClause.Value.Accept(translator); } if (first) { // If first is still true, it indicates there were no set // clauses. Introduce a fake set clause so that: // - we acquire the appropriate locks // - server-gen columns (e.g. timestamp) get recomputed // // We use the following pattern: // // update Foo // set @i = 0 // where ... DbParameter parameter = translator.CreateParameter(default(Int32), DbType.Int32); commandText.Append(parameter.ParameterName); commandText.Append(" = 0"); } commandText.AppendLine(); // where c1 = ..., c2 = ... commandText.Append("WHERE "); tree.Predicate.Accept(translator); commandText.AppendLine(); // generate returning sql GenerateReturningSql(commandText, tree, translator, tree.Returning); parameters = translator.Parameters; return commandText.ToString(); } internal static string GenerateDeleteSql(DbDeleteCommandTree tree, out List<DbParameter> parameters) { StringBuilder commandText = new StringBuilder(s_commandTextBuilderInitialCapacity); ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, false, "DeleteFunction"); // delete [schemaName].[tableName] commandText.Append("DELETE FROM "); tree.Target.Expression.Accept(translator); commandText.AppendLine(); // where c1 = ... AND c2 = ... commandText.Append("WHERE "); tree.Predicate.Accept(translator); parameters = translator.Parameters; commandText.AppendLine(";"); return commandText.ToString(); } internal static string GenerateInsertSql(DbInsertCommandTree tree, out List<DbParameter> parameters) { StringBuilder commandText = new StringBuilder(s_commandTextBuilderInitialCapacity); ExpressionTranslator translator = new ExpressionTranslator(commandText, tree, null != tree.Returning, "InsertFunction"); // insert [schemaName].[tableName] commandText.Append("INSERT INTO "); tree.Target.Expression.Accept(translator); if (tree.SetClauses.Count > 0) { // (c1, c2, c3, ...) commandText.Append("("); bool first = true; foreach (DbSetClause setClause in tree.SetClauses) { if (first) { first = false; } else { commandText.Append(", "); } setClause.Property.Accept(translator); } commandText.AppendLine(")"); // values c1, c2, ... first = true; commandText.Append(" VALUES ("); foreach (DbSetClause setClause in tree.SetClauses) { if (first) { first = false; } else { commandText.Append(", "); } setClause.Value.Accept(translator); translator.RegisterMemberValue(setClause.Property, setClause.Value); } commandText.AppendLine(");"); } else // No columns specified. Insert an empty row containing default values by inserting null into the rowid { commandText.AppendLine(" DEFAULT VALUES;"); } // generate returning sql GenerateReturningSql(commandText, tree, translator, tree.Returning); parameters = translator.Parameters; return commandText.ToString(); } // Generates T-SQL describing a member // Requires: member must belong to an entity type (a safe requirement for DML // SQL gen, where we only access table columns) private static string GenerateMemberTSql(EdmMember member) { return SqlGenerator.QuoteIdentifier(member.Name); } /// <summary> /// Generates SQL fragment returning server-generated values. /// Requires: translator knows about member values so that we can figure out /// how to construct the key predicate. /// <code> /// Sample SQL: /// /// select IdentityValue /// from dbo.MyTable /// where @@ROWCOUNT > 0 and IdentityValue = scope_identity() /// /// or /// /// select TimestamptValue /// from dbo.MyTable /// where @@ROWCOUNT > 0 and Id = 1 /// /// Note that we filter on rowcount to ensure no rows are returned if no rows were modified. /// </code> /// </summary> /// <param name="commandText">Builder containing command text</param> /// <param name="tree">Modification command tree</param> /// <param name="translator">Translator used to produce DML SQL statement /// for the tree</param> /// <param name="returning">Returning expression. If null, the method returns /// immediately without producing a SELECT statement.</param> private static void GenerateReturningSql(StringBuilder commandText, DbModificationCommandTree tree, ExpressionTranslator translator, DbExpression returning) { // Nothing to do if there is no Returning expression if (null == returning) { return; } // select commandText.Append("SELECT "); returning.Accept(translator); commandText.AppendLine(); // from commandText.Append("FROM "); tree.Target.Expression.Accept(translator); commandText.AppendLine(); // where commandText.Append("WHERE last_rows_affected() > 0"); EntitySetBase table = ((DbScanExpression)tree.Target.Expression).Target; bool identity = false; foreach (EdmMember keyMember in table.ElementType.KeyMembers) { commandText.Append(" AND "); commandText.Append(GenerateMemberTSql(keyMember)); commandText.Append(" = "); // retrieve member value sql. the translator remembers member values // as it constructs the DML statement (which precedes the "returning" // SQL) DbParameter value; if (translator.MemberValues.TryGetValue(keyMember, out value)) { commandText.Append(value.ParameterName); } else { // if no value is registered for the key member, it means it is an identity // which can be retrieved using the scope_identity() function if (identity) { // there can be only one server generated key throw new NotSupportedException(string.Format("Server generated keys are only supported for identity columns. More than one key column is marked as server generated in table '{0}'.", table.Name)); } commandText.AppendLine("last_insert_rowid();"); identity = true; } } } /// <summary> /// Lightweight expression translator for DML expression trees, which have constrained /// scope and support. /// </summary> private class ExpressionTranslator : DbExpressionVisitor { /// <summary> /// Initialize a new expression translator populating the given string builder /// with command text. Command text builder and command tree must not be null. /// </summary> /// <param name="commandText">Command text with which to populate commands</param> /// <param name="commandTree">Command tree generating SQL</param> /// <param name="preserveMemberValues">Indicates whether the translator should preserve /// member values while compiling t-SQL (only needed for server generation)</param> internal ExpressionTranslator(StringBuilder commandText, DbModificationCommandTree commandTree, bool preserveMemberValues, string kind) { Debug.Assert(null != commandText); Debug.Assert(null != commandTree); _kind = kind; _commandText = commandText; _commandTree = commandTree; _parameters = new List<DbParameter>(); _memberValues = preserveMemberValues ? new Dictionary<EdmMember, DbParameter>() : null; } private readonly StringBuilder _commandText; private readonly DbModificationCommandTree _commandTree; private readonly List<DbParameter> _parameters; private readonly Dictionary<EdmMember, DbParameter> _memberValues; private int parameterNameCount = 0; private string _kind; internal List<DbParameter> Parameters { get { return _parameters; } } internal Dictionary<EdmMember, DbParameter> MemberValues { get { return _memberValues; } } // generate parameter (name based on parameter ordinal) internal SQLiteParameter CreateParameter(object value, TypeUsage type) { PrimitiveTypeKind primitiveType = MetadataHelpers.GetPrimitiveTypeKind(type); DbType dbType = MetadataHelpers.GetDbType(primitiveType); return CreateParameter(value, dbType); } // Creates a new parameter for a value in this expression translator internal SQLiteParameter CreateParameter(object value, DbType dbType) { string parameterName = string.Concat("@p", parameterNameCount.ToString(CultureInfo.InvariantCulture)); parameterNameCount++; SQLiteParameter parameter = new SQLiteParameter(parameterName, value); parameter.DbType = dbType; _parameters.Add(parameter); return parameter; } #region Basics public override void Visit(DbApplyExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); if (expression.Apply != null) { VisitExpression(expression.Apply.Expression); } VisitExpressionBindingPost(expression.Input); } public override void Visit(DbArithmeticExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionList(expression.Arguments); } public override void Visit(DbCaseExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionList(expression.When); VisitExpressionList(expression.Then); VisitExpression(expression.Else); } public override void Visit(DbCastExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbCrossJoinExpression expression) { if (expression == null) throw new ArgumentException("expression"); foreach (DbExpressionBinding binding in expression.Inputs) { VisitExpressionBindingPre(binding); } foreach (DbExpressionBinding binding2 in expression.Inputs) { VisitExpressionBindingPost(binding2); } } public override void Visit(DbDerefExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbDistinctExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbElementExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbEntityRefExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbExceptExpression expression) { VisitBinary(expression); } protected virtual void VisitBinary(DbBinaryExpression expression) { if (expression == null) throw new ArgumentException("expression"); this.VisitExpression(expression.Left); this.VisitExpression(expression.Right); } public override void Visit(DbExpression expression) { if (expression == null) throw new ArgumentException("expression"); throw new NotSupportedException("DbExpression"); } public override void Visit(DbFilterExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Predicate); VisitExpressionBindingPost(expression.Input); } public override void Visit(DbFunctionExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionList(expression.Arguments); //if (expression.IsLambda) //{ // VisitLambdaFunctionPre(expression.Function, expression.LambdaBody); // VisitExpression(expression.LambdaBody); // VisitLambdaFunctionPost(expression.Function, expression.LambdaBody); //} } public override void Visit(DbGroupByExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitGroupExpressionBindingPre(expression.Input); VisitExpressionList(expression.Keys); VisitGroupExpressionBindingMid(expression.Input); VisitAggregateList(expression.Aggregates); VisitGroupExpressionBindingPost(expression.Input); } public override void Visit(DbIntersectExpression expression) { VisitBinary(expression); } public override void Visit(DbIsEmptyExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbIsOfExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbJoinExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Left); VisitExpressionBindingPre(expression.Right); VisitExpression(expression.JoinCondition); VisitExpressionBindingPost(expression.Left); VisitExpressionBindingPost(expression.Right); } public override void Visit(DbLikeExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpression(expression.Argument); VisitExpression(expression.Pattern); VisitExpression(expression.Escape); } public override void Visit(DbLimitExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpression(expression.Argument); VisitExpression(expression.Limit); } public override void Visit(DbOfTypeExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbParameterReferenceExpression expression) { if (expression == null) throw new ArgumentException("expression"); } public override void Visit(DbProjectExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Projection); VisitExpressionBindingPost(expression.Input); } public override void Visit(DbQuantifierExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Predicate); VisitExpressionBindingPost(expression.Input); } public override void Visit(DbRefExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbRefKeyExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbRelationshipNavigationExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpression(expression.NavigationSource); } public override void Visit(DbSkipExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); foreach (DbSortClause clause in expression.SortOrder) { VisitExpression(clause.Expression); } VisitExpressionBindingPost(expression.Input); VisitExpression(expression.Count); } public override void Visit(DbSortExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpressionBindingPre(expression.Input); for (int i = 0; i < expression.SortOrder.Count; i++) { VisitExpression(expression.SortOrder[i].Expression); } VisitExpressionBindingPost(expression.Input); } public override void Visit(DbTreatExpression expression) { VisitUnaryExpression(expression); } public override void Visit(DbUnionAllExpression expression) { VisitBinary(expression); } public override void Visit(DbVariableReferenceExpression expression) { if (expression == null) throw new ArgumentException("expression"); } public virtual void VisitAggregate(DbAggregate aggregate) { if (aggregate == null) throw new ArgumentException("aggregate"); VisitExpressionList(aggregate.Arguments); } public virtual void VisitAggregateList(IList<DbAggregate> aggregates) { if (aggregates == null) throw new ArgumentException("aggregates"); for (int i = 0; i < aggregates.Count; i++) { VisitAggregate(aggregates[i]); } } public virtual void VisitExpression(DbExpression expression) { if (expression == null) throw new ArgumentException("expression"); expression.Accept(this); } protected virtual void VisitExpressionBindingPost(DbExpressionBinding binding) { } protected virtual void VisitExpressionBindingPre(DbExpressionBinding binding) { if (binding == null) throw new ArgumentException("binding"); VisitExpression(binding.Expression); } public virtual void VisitExpressionList(IList<DbExpression> expressionList) { if (expressionList == null) throw new ArgumentException("expressionList"); for (int i = 0; i < expressionList.Count; i++) { VisitExpression(expressionList[i]); } } protected virtual void VisitGroupExpressionBindingMid(DbGroupExpressionBinding binding) { } protected virtual void VisitGroupExpressionBindingPost(DbGroupExpressionBinding binding) { } protected virtual void VisitGroupExpressionBindingPre(DbGroupExpressionBinding binding) { if (binding == null) throw new ArgumentException("binding"); VisitExpression(binding.Expression); } protected virtual void VisitLambdaFunctionPost(EdmFunction function, DbExpression body) { } protected virtual void VisitLambdaFunctionPre(EdmFunction function, DbExpression body) { if (function == null) throw new ArgumentException("function"); if (body == null) throw new ArgumentException("body"); } //internal virtual void VisitRelatedEntityReference(DbRelatedEntityRef relatedEntityRef) //{ // VisitExpression(relatedEntityRef.TargetEntityReference); //} //internal virtual void VisitRelatedEntityReferenceList(IList<DbRelatedEntityRef> relatedEntityReferences) //{ // for (int i = 0; i < relatedEntityReferences.Count; i++) // { // VisitRelatedEntityReference(relatedEntityReferences[i]); // } //} protected virtual void VisitUnaryExpression(DbUnaryExpression expression) { if (expression == null) throw new ArgumentException("expression"); VisitExpression(expression.Argument); } #endregion public override void Visit(DbAndExpression expression) { VisitBinary(expression, " AND "); } public override void Visit(DbOrExpression expression) { VisitBinary(expression, " OR "); } public override void Visit(DbComparisonExpression expression) { Debug.Assert(expression.ExpressionKind == DbExpressionKind.Equals, "only equals comparison expressions are produced in DML command trees in V1"); VisitBinary(expression, " = "); RegisterMemberValue(expression.Left, expression.Right); } /// <summary> /// Call this method to register a property value pair so the translator "remembers" /// the values for members of the row being modified. These values can then be used /// to form a predicate for server-generation (based on the key of the row) /// </summary> /// <param name="propertyExpression">DbExpression containing the column reference (property expression).</param> /// <param name="value">DbExpression containing the value of the column.</param> internal void RegisterMemberValue(DbExpression propertyExpression, DbExpression value) { if (null != _memberValues) { // register the value for this property Debug.Assert(propertyExpression.ExpressionKind == DbExpressionKind.Property, "DML predicates and setters must be of the form property = value"); // get name of left property EdmMember property = ((DbPropertyExpression)propertyExpression).Property; // don't track null values if (value.ExpressionKind != DbExpressionKind.Null) { Debug.Assert(value.ExpressionKind == DbExpressionKind.Constant, "value must either constant or null"); // retrieve the last parameter added (which describes the parameter) _memberValues[property] = _parameters[_parameters.Count - 1]; } } } public override void Visit(DbIsNullExpression expression) { expression.Argument.Accept(this); _commandText.Append(" IS NULL"); } public override void Visit(DbNotExpression expression) { _commandText.Append("NOT ("); expression.Accept(this); _commandText.Append(")"); } public override void Visit(DbConstantExpression expression) { SQLiteParameter parameter = CreateParameter(expression.Value, expression.ResultType); _commandText.Append(parameter.ParameterName); } public override void Visit(DbScanExpression expression) { string definingQuery = MetadataHelpers.TryGetValueForMetadataProperty<string>(expression.Target, "DefiningQuery"); if (definingQuery != null) { throw new NotSupportedException(String.Format("Unable to update the EntitySet '{0}' because it has a DefiningQuery and no <{1}> element exists in the <ModificationFunctionMapping> element to support the current operation.", expression.Target.Name, _kind)); } _commandText.Append(SqlGenerator.GetTargetTSql(expression.Target)); } public override void Visit(DbPropertyExpression expression) { _commandText.Append(GenerateMemberTSql(expression.Property)); } public override void Visit(DbNullExpression expression) { _commandText.Append("NULL"); } public override void Visit(DbNewInstanceExpression expression) { // assumes all arguments are self-describing (no need to use aliases // because no renames are ever used in the projection) bool first = true; foreach (DbExpression argument in expression.Arguments) { if (first) { first = false; } else { _commandText.Append(", "); } argument.Accept(this); } } private void VisitBinary(DbBinaryExpression expression, string separator) { _commandText.Append("("); expression.Left.Accept(this); _commandText.Append(separator); expression.Right.Accept(this); _commandText.Append(")"); } } } } |
Added System.Data.SQLite.Linq/SQL Generation/ISqlFragment.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | //--------------------------------------------------------------------- // <copyright file="ISqlFragment.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// Represents the sql fragment for any node in the query tree. /// </summary> /// <remarks> /// The nodes in a query tree produce various kinds of sql /// <list type="bullet"> /// <item>A select statement.</item> /// <item>A reference to an extent. (symbol)</item> /// <item>A raw string.</item> /// </list> /// We have this interface to allow for a common return type for the methods /// in the expression visitor <see cref="DbExpressionVisitor{T}"/> /// /// At the end of translation, the sql fragments are converted into real strings. /// </remarks> internal interface ISqlFragment { /// <summary> /// Write the string represented by this fragment into the stream. /// </summary> /// <param name="writer">The stream that collects the strings.</param> /// <param name="sqlGenerator">Context information used for renaming. /// The global lists are used to generated new names without collisions.</param> void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator); } } |
Added System.Data.SQLite.Linq/SQL Generation/InternalBase.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | /******************************************************** * ADO.NET 2.0 Data Provider for SQLite Version 3.X * Written by Robert Simpson (robert@blackcastlesoft.com) * * Released to the public domain, use at your own risk! ********************************************************/ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime; namespace System.Data.SQLite { internal abstract class InternalBase { // Methods [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] protected InternalBase() { } internal abstract void ToCompactString(StringBuilder builder); internal virtual string ToFullString() { StringBuilder builder = new StringBuilder(); this.ToFullString(builder); return builder.ToString(); } [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] internal virtual void ToFullString(StringBuilder builder) { this.ToCompactString(builder); } public override string ToString() { StringBuilder builder = new StringBuilder(); this.ToCompactString(builder); return builder.ToString(); } } } |
Added System.Data.SQLite.Linq/SQL Generation/JoinSymbol.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | //--------------------------------------------------------------------- // <copyright file="JoinSymbol.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// A Join symbol is a special kind of Symbol. /// It has to carry additional information /// <list type="bullet"> /// <item>ColumnList for the list of columns in the select clause if this /// symbol represents a sql select statement. This is set by <see cref="SqlGenerator.AddDefaultColumns"/>. </item> /// <item>ExtentList is the list of extents in the select clause.</item> /// <item>FlattenedExtentList - if the Join has multiple extents flattened at the /// top level, we need this information to ensure that extent aliases are renamed /// correctly in <see cref="SqlSelectStatement.WriteSql"/></item> /// <item>NameToExtent has all the extents in ExtentList as a dictionary. /// This is used by <see cref="SqlGenerator.Visit(DbPropertyExpression)"/> to flatten /// record accesses.</item> /// <item>IsNestedJoin - is used to determine whether a JoinSymbol is an /// ordinary join symbol, or one that has a corresponding SqlSelectStatement.</item> /// </list> /// /// All the lists are set exactly once, and then used for lookups/enumerated. /// </summary> internal sealed class JoinSymbol : Symbol { private List<Symbol> columnList; internal List<Symbol> ColumnList { get { if (null == columnList) { columnList = new List<Symbol>(); } return columnList; } set { columnList = value; } } private List<Symbol> extentList; internal List<Symbol> ExtentList { get { return extentList; } } private List<Symbol> flattenedExtentList; internal List<Symbol> FlattenedExtentList { get { if (null == flattenedExtentList) { flattenedExtentList = new List<Symbol>(); } return flattenedExtentList; } set { flattenedExtentList = value; } } private Dictionary<string, Symbol> nameToExtent; internal Dictionary<string, Symbol> NameToExtent { get { return nameToExtent; } } private bool isNestedJoin; internal bool IsNestedJoin { get { return isNestedJoin; } set { isNestedJoin = value; } } public JoinSymbol(string name, TypeUsage type, List<Symbol> extents) : base(name, type) { extentList = new List<Symbol>(extents.Count); nameToExtent = new Dictionary<string, Symbol>(extents.Count, StringComparer.OrdinalIgnoreCase); foreach (Symbol symbol in extents) { this.nameToExtent[symbol.Name] = symbol; this.ExtentList.Add(symbol); } } } } |
Added System.Data.SQLite.Linq/SQL Generation/KeyToListMap.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /******************************************************** * ADO.NET 2.0 Data Provider for SQLite Version 3.X * Written by Robert Simpson (robert@blackcastlesoft.com) * * Released to the public domain, use at your own risk! ********************************************************/ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections.ObjectModel; using System.Runtime; using System.Runtime.CompilerServices; using System.Collections; namespace System.Data.SQLite { internal class KeyToListMap<TKey, TValue> : InternalBase { // Fields private Dictionary<TKey, List<TValue>> m_map; // Methods internal KeyToListMap(IEqualityComparer<TKey> comparer) { this.m_map = new Dictionary<TKey, List<TValue>>(comparer); } internal void Add(TKey key, TValue value) { List<TValue> list; if (!this.m_map.TryGetValue(key, out list)) { list = new List<TValue>(); this.m_map[key] = list; } list.Add(value); } internal void AddRange(TKey key, IEnumerable<TValue> values) { foreach (TValue local in values) { this.Add(key, local); } } internal bool ContainsKey(TKey key) { return this.m_map.ContainsKey(key); } internal IEnumerable<TValue> EnumerateValues(TKey key) { List<TValue> values; if (m_map.TryGetValue(key, out values)) { foreach (TValue value in values) { yield return value; } } } internal ReadOnlyCollection<TValue> ListForKey(TKey key) { return new ReadOnlyCollection<TValue>(this.m_map[key]); } internal bool RemoveKey(TKey key) { return this.m_map.Remove(key); } internal override void ToCompactString(StringBuilder builder) { foreach (TKey local in this.Keys) { StringUtil.FormatStringBuilder(builder, "{0}", new object[] { local }); builder.Append(": "); IEnumerable<TValue> list = this.ListForKey(local); StringUtil.ToSeparatedString(builder, list, ",", "null"); builder.Append("; "); } } internal bool TryGetListForKey(TKey key, out ReadOnlyCollection<TValue> valueCollection) { List<TValue> list; valueCollection = null; if (this.m_map.TryGetValue(key, out list)) { valueCollection = new ReadOnlyCollection<TValue>(list); return true; } return false; } // Properties internal IEnumerable<TValue> AllValues { get { foreach (TKey key in Keys) { foreach (TValue value in ListForKey(key)) { yield return value; } } } } internal IEnumerable<TKey> Keys { get { return this.m_map.Keys; } } internal IEnumerable<KeyValuePair<TKey, List<TValue>>> KeyValuePairs { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get { return this.m_map; } } } } |
Added System.Data.SQLite.Linq/SQL Generation/License.txt.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | Microsoft Public License (Ms-PL) This license governs use of the accompanying software. If you use the software, you accept this license. If you do not accept the license, do not use the software. 1. Definitions The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under U.S. copyright law. A "contribution" is the original software, or any additions or changes to the software. A "contributor" is any person that distributes its contribution under this license. "Licensed patents" are a contributor's patent claims that read directly on its contribution. 2. Grant of Rights (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create. (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software. 3. Conditions and Limitations (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks. (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your patent license from such contributor to the software ends automatically. (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution notices that are present in the software. (D) If you distribute any portion of the software in source code form, you may do so only under this license by including a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object code form, you may only do so under a license that complies with this license. (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular purpose and non-infringement. |
Added System.Data.SQLite.Linq/SQL Generation/MetadataHelpers.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 | //--------------------------------------------------------------------- // <copyright file="MetadataHelpers.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Data; using System.Data.Common; using System.Collections.Generic; using System.Data.Metadata.Edm; using System.Diagnostics; /// <summary> /// A set of static helpers for type metadata /// </summary> static class MetadataHelpers { #region Type Helpers /// <summary> /// Cast the EdmType of the given type usage to the given TEdmType /// </summary> /// <typeparam name="TEdmType"></typeparam> /// <param name="typeUsage"></param> /// <returns></returns> internal static TEdmType GetEdmType<TEdmType>(TypeUsage typeUsage) where TEdmType : EdmType { return (TEdmType)typeUsage.EdmType; } /// <summary> /// Gets the TypeUsage of the elment if the given type is a collection type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static TypeUsage GetElementTypeUsage(TypeUsage type) { if (MetadataHelpers.IsCollectionType(type)) { return ((CollectionType)type.EdmType).TypeUsage; } return null; } /// <summary> /// Retrieves the properties of in the EdmType underlying the input type usage, /// if that EdmType is a structured type (EntityType, RowType). /// </summary> /// <param name="typeUsage"></param> /// <returns></returns> internal static IList<EdmProperty> GetProperties(TypeUsage typeUsage) { return MetadataHelpers.GetProperties(typeUsage.EdmType); } /// <summary> /// Retrieves the properties of the given EdmType, if it is /// a structured type (EntityType, RowType). /// </summary> /// <param name="edmType"></param> /// <returns></returns> internal static IList<EdmProperty> GetProperties(EdmType edmType) { switch (edmType.BuiltInTypeKind) { case BuiltInTypeKind.ComplexType: return ((ComplexType)edmType).Properties; case BuiltInTypeKind.EntityType: return ((EntityType)edmType).Properties; case BuiltInTypeKind.RowType: return ((RowType)edmType).Properties; default: return new List<EdmProperty>(); } } /// <summary> /// Is the given type usage over a collection type /// </summary> /// <param name="typeUsage"></param> /// <returns></returns> internal static bool IsCollectionType(TypeUsage typeUsage) { return MetadataHelpers.IsCollectionType(typeUsage.EdmType); } /// <summary> /// Is the given type a collection type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static bool IsCollectionType(EdmType type) { return (BuiltInTypeKind.CollectionType == type.BuiltInTypeKind); } /// <summary> /// Is the given type usage over a primitive type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static bool IsPrimitiveType(TypeUsage type) { return MetadataHelpers.IsPrimitiveType(type.EdmType); } /// <summary> /// Is the given type a primitive type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static bool IsPrimitiveType(EdmType type) { return (BuiltInTypeKind.PrimitiveType == type.BuiltInTypeKind); } /// <summary> /// Is the given type usage over a row type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static bool IsRowType(TypeUsage type) { return MetadataHelpers.IsRowType(type.EdmType); } /// <summary> /// Is the given type a row type /// </summary> /// <param name="type"></param> /// <returns></returns> internal static bool IsRowType(EdmType type) { return (BuiltInTypeKind.RowType == type.BuiltInTypeKind); } /// <summary> /// Gets the type of the given type usage if it is a primitive type /// </summary> /// <param name="type"></param> /// <param name="typeKind"></param> /// <returns></returns> internal static bool TryGetPrimitiveTypeKind(TypeUsage type, out PrimitiveTypeKind typeKind) { if (type != null && type.EdmType != null && type.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType) { typeKind = ((PrimitiveType)type.EdmType).PrimitiveTypeKind; return true; } typeKind = default(PrimitiveTypeKind); return false; } internal static PrimitiveTypeKind GetPrimitiveTypeKind(TypeUsage type) { PrimitiveTypeKind returnValue; if (!MetadataHelpers.TryGetPrimitiveTypeKind(type, out returnValue)) { Debug.Assert(false, "Cannot create parameter of non-primitive type"); throw new NotSupportedException("Cannot create parameter of non-primitive type"); } return returnValue; } /// <summary> /// Gets the value for the metadata property with the given name /// </summary> /// <typeparam name="T"></typeparam> /// <param name="item"></param> /// <param name="propertyName"></param> /// <returns></returns> internal static T TryGetValueForMetadataProperty<T>(MetadataItem item, string propertyName) { MetadataProperty property; if (!item.MetadataProperties.TryGetValue(propertyName, true, out property)) { return default(T); } return (T)property.Value; } internal static bool IsPrimitiveType(TypeUsage type, PrimitiveTypeKind primitiveType) { PrimitiveTypeKind typeKind; if (TryGetPrimitiveTypeKind(type, out typeKind)) { return (typeKind == primitiveType); } return false; } internal static DbType GetDbType(PrimitiveTypeKind primitiveType) { switch (primitiveType) { case PrimitiveTypeKind.Binary: return DbType.Binary; case PrimitiveTypeKind.Boolean: return DbType.Boolean; case PrimitiveTypeKind.Byte: return DbType.Byte; case PrimitiveTypeKind.DateTime: return DbType.DateTime; case PrimitiveTypeKind.Decimal: return DbType.Decimal; case PrimitiveTypeKind.Double: return DbType.Double; case PrimitiveTypeKind.Single: return DbType.Single; case PrimitiveTypeKind.Guid: return DbType.Guid; case PrimitiveTypeKind.Int16: return DbType.Int16; case PrimitiveTypeKind.Int32: return DbType.Int32; case PrimitiveTypeKind.Int64: return DbType.Int64; //case PrimitiveTypeKind.Money: return DbType.Decimal; case PrimitiveTypeKind.SByte: return DbType.SByte; case PrimitiveTypeKind.String: return DbType.String; //case PrimitiveTypeKind.UInt16: return DbType.UInt16; //case PrimitiveTypeKind.UInt32: return DbType.UInt32; //case PrimitiveTypeKind.UInt64: return DbType.UInt64; //case PrimitiveTypeKind.Xml: return DbType.Xml; default: Debug.Fail("unknown PrimitiveTypeKind" + primitiveType.ToString()); throw new InvalidOperationException(string.Format("Unknown PrimitiveTypeKind {0}", primitiveType)); } } #endregion #region Facet Support internal static readonly int UnicodeStringMaxMaxLength = Int32.MaxValue; internal static readonly int AsciiStringMaxMaxLength = Int32.MaxValue; internal static readonly int BinaryMaxMaxLength = Int32.MaxValue; #region Facet Names /// <summary> /// Name of the MaxLength Facet /// </summary> public static readonly string MaxLengthFacetName = "MaxLength"; /// <summary> /// Name of the Unicode Facet /// </summary> public static readonly string UnicodeFacetName = "Unicode"; /// <summary> /// Name of the FixedLength Facet /// </summary> public static readonly string FixedLengthFacetName = "FixedLength"; /// <summary> /// Name of the PreserveSeconds Facet /// </summary> public static readonly string PreserveSecondsFacetName = "PreserveSeconds"; /// <summary> /// Name of the Precision Facet /// </summary> public static readonly string PrecisionFacetName = "Precision"; /// <summary> /// Name of the Scale Facet /// </summary> public static readonly string ScaleFacetName = "Scale"; /// <summary> /// Name of the DefaultValue Facet /// </summary> public static readonly string DefaultValueFacetName = "DefaultValue"; /// <summary> /// Name of the Nullable Facet /// </summary> internal const string NullableFacetName = "Nullable"; #endregion #region Facet Retreival Helpers /// <summary> /// Get the value specified on the given type usage for the given facet name. /// If the faces does not have a value specifid or that value is null returns /// the default value for that facet. /// </summary> /// <typeparam name="T"></typeparam> /// <param name="type"></param> /// <param name="facetName"></param> /// <returns></returns> /// <summary> /// Get the value specified on the given type usage for the given facet name. /// If the faces does not have a value specifid or that value is null returns /// the default value for that facet. /// </summary> /// <typeparam name="T"></typeparam> /// <param name="type"></param> /// <param name="facetName"></param> /// <returns></returns> internal static T GetFacetValueOrDefault<T>(TypeUsage type, string facetName, T defaultValue) { //Get the value for the facet, if any Facet facet; if (type.Facets.TryGetValue(facetName, false, out facet) && facet.Value != null && !facet.IsUnbounded) { return (T)facet.Value; } else { return defaultValue; } } internal static bool IsFacetValueConstant(TypeUsage type, string facetName) { return MetadataHelpers.GetFacet(((PrimitiveType)type.EdmType).FacetDescriptions, facetName).IsConstant; } private static FacetDescription GetFacet(IEnumerable<FacetDescription> facetCollection, string facetName) { foreach (FacetDescription facetDescription in facetCollection) { if (facetDescription.FacetName == facetName) { return facetDescription; } } return null; } /// <summary> /// Given a facet name and an EdmType, tries to get that facet's description. /// </summary> /// <param name="edmType"></param> /// <param name="facetName"></param> /// <param name="facetDescription"></param> /// <returns></returns> internal static bool TryGetTypeFacetDescriptionByName(EdmType edmType, string facetName, out FacetDescription facetDescription) { facetDescription = null; if (MetadataHelpers.IsPrimitiveType(edmType)) { PrimitiveType primitiveType = (PrimitiveType)edmType; foreach (FacetDescription fd in primitiveType.FacetDescriptions) { if (facetName.Equals(fd.FacetName, StringComparison.OrdinalIgnoreCase)) { facetDescription = fd; return true; } } } return false; } internal static bool IsNullable(TypeUsage type) { Facet nullableFacet; if (type.Facets.TryGetValue(NullableFacetName, false, out nullableFacet)) { return (bool)nullableFacet.Value; } return false; } internal static bool TryGetMaxLength(TypeUsage type, out int maxLength) { if (!IsPrimitiveType(type, PrimitiveTypeKind.String) && !IsPrimitiveType(type, PrimitiveTypeKind.Binary)) { maxLength = 0; return false; } // Binary and String FixedLength facets share the same name return TryGetIntFacetValue(type, MaxLengthFacetName, out maxLength); } internal static bool TryGetIntFacetValue(TypeUsage type, string facetName, out int intValue) { intValue = 0; Facet intFacet; if (type.Facets.TryGetValue(facetName, false, out intFacet) && intFacet.Value != null && !intFacet.IsUnbounded) { intValue = (int)intFacet.Value; return true; } return false; } internal static bool TryGetIsFixedLength(TypeUsage type, out bool isFixedLength) { if (!IsPrimitiveType(type, PrimitiveTypeKind.String) && !IsPrimitiveType(type, PrimitiveTypeKind.Binary)) { isFixedLength = false; return false; } // Binary and String MaxLength facets share the same name return TryGetBooleanFacetValue(type, FixedLengthFacetName, out isFixedLength); } internal static bool TryGetBooleanFacetValue(TypeUsage type, string facetName, out bool boolValue) { boolValue = false; Facet boolFacet; if (type.Facets.TryGetValue(facetName, false, out boolFacet) && boolFacet.Value != null) { boolValue = (bool)boolFacet.Value; return true; } return false; } internal static bool TryGetIsUnicode(TypeUsage type, out bool isUnicode) { if (!IsPrimitiveType(type, PrimitiveTypeKind.String)) { isUnicode = false; return false; } return TryGetBooleanFacetValue(type, UnicodeFacetName, out isUnicode); } #endregion #endregion internal static bool IsCanonicalFunction(EdmFunction function) { return (function.NamespaceName == "Edm"); } internal static bool IsStoreFunction(EdmFunction function) { return !IsCanonicalFunction(function); } // Returns ParameterDirection corresponding to given ParameterMode internal static ParameterDirection ParameterModeToParameterDirection(ParameterMode mode) { switch (mode) { case ParameterMode.In: return ParameterDirection.Input; case ParameterMode.InOut: return ParameterDirection.InputOutput; case ParameterMode.Out: return ParameterDirection.Output; case ParameterMode.ReturnValue: return ParameterDirection.ReturnValue; default: Debug.Fail("unrecognized mode " + mode.ToString()); return default(ParameterDirection); } } } } |
Added System.Data.SQLite.Linq/SQL Generation/SqlBuilder.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | //--------------------------------------------------------------------- // <copyright file="SqlBuilder.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// This class is like StringBuilder. While traversing the tree for the first time, /// we do not know all the strings that need to be appended e.g. things that need to be /// renamed, nested select statements etc. So, we use a builder that can collect /// all kinds of sql fragments. /// </summary> internal sealed class SqlBuilder : ISqlFragment { private List<object> _sqlFragments; private List<object> sqlFragments { get { if (null == _sqlFragments) { _sqlFragments = new List<object>(); } return _sqlFragments; } } /// <summary> /// Add an object to the list - we do not verify that it is a proper sql fragment /// since this is an internal method. /// </summary> /// <param name="s"></param> public void Append(object s) { Debug.Assert(s != null); sqlFragments.Add(s); } /// <summary> /// This is to pretty print the SQL. The writer <see cref="SqlWriter.Write"/> /// needs to know about new lines so that it can add the right amount of /// indentation at the beginning of lines. /// </summary> public void AppendLine() { sqlFragments.Add("\r\n"); } /// <summary> /// Whether the builder is empty. This is used by the <see cref="SqlGenerator.Visit(DbProjectExpression)"/> /// to determine whether a sql statement can be reused. /// </summary> public bool IsEmpty { get { return ((null == _sqlFragments) || (0 == _sqlFragments.Count)); } } #region ISqlFragment Members /// <summary> /// We delegate the writing of the fragment to the appropriate type. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { if (null != _sqlFragments) { foreach (object o in _sqlFragments) { string str = (o as String); if (null != str) { writer.Write(str); } else { ISqlFragment sqlFragment = (o as ISqlFragment); if (null != sqlFragment) { sqlFragment.WriteSql(writer, sqlGenerator); } else { throw new InvalidOperationException(); } } } } } #endregion } } |
Deleted System.Data.SQLite.Linq/SQL Generation/SqlChecker.cs.
Added System.Data.SQLite.Linq/SQL Generation/SqlGenerator.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 | //--------------------------------------------------------------------- // <copyright file="SqlGenerator.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Linq; using System.Diagnostics; using System.Globalization; using System.IO; using System.Text; using System.Data.Common; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; using System.Data; using System.Collections.ObjectModel; using System.Collections.Generic; /// <summary> /// Translates the command object into a SQL string that can be executed on /// SQLite. /// </summary> /// <remarks> /// The translation is implemented as a visitor <see cref="DbExpressionVisitor{T}"/> /// over the query tree. It makes a single pass over the tree, collecting the sql /// fragments for the various nodes in the tree <see cref="ISqlFragment"/>. /// /// The major operations are /// <list type="bullet"> /// <item>Select statement minimization. Multiple nodes in the query tree /// that can be part of a single SQL select statement are merged. e.g. a /// Filter node that is the input of a Project node can typically share the /// same SQL statement.</item> /// <item>Alpha-renaming. As a result of the statement minimization above, there /// could be name collisions when using correlated subqueries /// <example> /// <code> /// Filter( /// b = Project( c.x /// c = Extent(foo) /// ) /// exists ( /// Filter( /// c = Extent(foo) /// b.x = c.x /// ) /// ) /// ) /// </code> /// The first Filter, Project and Extent will share the same SQL select statement. /// The alias for the Project i.e. b, will be replaced with c. /// If the alias c for the Filter within the exists clause is not renamed, /// we will get <c>c.x = c.x</c>, which is incorrect. /// Instead, the alias c within the second filter should be renamed to c1, to give /// <c>c.x = c1.x</c> i.e. b is renamed to c, and c is renamed to c1. /// </example> /// </item> /// <item>Join flattening. In the query tree, a list of join nodes is typically /// represented as a tree of Join nodes, each with 2 children. e.g. /// <example> /// <code> /// a = Join(InnerJoin /// b = Join(CrossJoin /// c = Extent(foo) /// d = Extent(foo) /// ) /// e = Extent(foo) /// on b.c.x = e.x /// ) /// </code> /// If translated directly, this will be translated to /// <code> /// FROM ( SELECT c.*, d.* /// FROM foo as c /// CROSS JOIN foo as d) as b /// INNER JOIN foo as e on b.x' = e.x /// </code> /// It would be better to translate this as /// <code> /// FROM foo as c /// CROSS JOIN foo as d /// INNER JOIN foo as e on c.x = e.x /// </code> /// This allows the optimizer to choose an appropriate join ordering for evaluation. /// </example> /// </item> /// <item>Select * and column renaming. In the example above, we noticed that /// in some cases we add <c>SELECT * FROM ...</c> to complete the SQL /// statement. i.e. there is no explicit PROJECT list. /// In this case, we enumerate all the columns available in the FROM clause /// This is particularly problematic in the case of Join trees, since the columns /// from the extents joined might have the same name - this is illegal. To solve /// this problem, we will have to rename columns if they are part of a SELECT * /// for a JOIN node - we do not need renaming in any other situation. /// <see cref="SqlGenerator.AddDefaultColumns"/>. /// </item> /// </list> /// /// <para> /// Renaming issues. /// When rows or columns are renamed, we produce names that are unique globally /// with respect to the query. The names are derived from the original names, /// with an integer as a suffix. e.g. CustomerId will be renamed to CustomerId1, /// CustomerId2 etc. /// /// Since the names generated are globally unique, they will not conflict when the /// columns of a JOIN SELECT statement are joined with another JOIN. /// /// </para> /// /// <para> /// Record flattening. /// SQL server does not have the concept of records. However, a join statement /// produces records. We have to flatten the record accesses into a simple /// <c>alias.column</c> form. <see cref="SqlGenerator.Visit(DbPropertyExpression)"/> /// </para> /// /// <para> /// Building the SQL. /// There are 2 phases /// <list type="numbered"> /// <item>Traverse the tree, producing a sql builder <see cref="SqlBuilder"/></item> /// <item>Write the SqlBuilder into a string, renaming the aliases and columns /// as needed.</item> /// </list> /// /// In the first phase, we traverse the tree. We cannot generate the SQL string /// right away, since /// <list type="bullet"> /// <item>The WHERE clause has to be visited before the from clause.</item> /// <item>extent aliases and column aliases need to be renamed. To minimize /// renaming collisions, all the names used must be known, before any renaming /// choice is made.</item> /// </list> /// To defer the renaming choices, we use symbols <see cref="Symbol"/>. These /// are renamed in the second phase. /// /// Since visitor methods cannot transfer information to child nodes through /// parameters, we use some global stacks, /// <list type="bullet"> /// <item>A stack for the current SQL select statement. This is needed by /// <see cref="SqlGenerator.Visit(DbVariableReferenceExpression)"/> to create a /// list of free variables used by a select statement. This is needed for /// alias renaming. /// </item> /// <item>A stack for the join context. When visiting a <see cref="DbScanExpression"/>, /// we need to know whether we are inside a join or not. If we are inside /// a join, we do not create a new SELECT statement.</item> /// </list> /// </para> /// /// <para> /// Global state. /// To enable renaming, we maintain /// <list type="bullet"> /// <item>The set of all extent aliases used.</item> /// <item>The set of all column aliases used.</item> /// </list> /// /// Finally, we have a symbol table to lookup variable references. All references /// to the same extent have the same symbol. /// </para> /// /// <para> /// Sql select statement sharing. /// /// Each of the relational operator nodes /// <list type="bullet"> /// <item>Project</item> /// <item>Filter</item> /// <item>GroupBy</item> /// <item>Sort/OrderBy</item> /// </list> /// can add its non-input (e.g. project, predicate, sort order etc.) to /// the SQL statement for the input, or create a new SQL statement. /// If it chooses to reuse the input's SQL statement, we play the following /// symbol table trick to accomplish renaming. The symbol table entry for /// the alias of the current node points to the symbol for the input in /// the input's SQL statement. /// <example> /// <code> /// Project(b.x /// b = Filter( /// c = Extent(foo) /// c.x = 5) /// ) /// </code> /// The Extent node creates a new SqlSelectStatement. This is added to the /// symbol table by the Filter as {c, Symbol(c)}. Thus, <c>c.x</c> is resolved to /// <c>Symbol(c).x</c>. /// Looking at the project node, we add {b, Symbol(c)} to the symbol table if the /// SQL statement is reused, and {b, Symbol(b)}, if there is no reuse. /// /// Thus, <c>b.x</c> is resolved to <c>Symbol(c).x</c> if there is reuse, and to /// <c>Symbol(b).x</c> if there is no reuse. /// </example> /// </para> /// </remarks> internal sealed class SqlGenerator : DbExpressionVisitor<ISqlFragment> { private SQLiteProviderManifest _manifest; #region Visitor parameter stacks /// <summary> /// Every relational node has to pass its SELECT statement to its children /// This allows them (DbVariableReferenceExpression eventually) to update the list of /// outer extents (free variables) used by this select statement. /// </summary> Stack<SqlSelectStatement> selectStatementStack; /// <summary> /// The top of the stack /// </summary> private SqlSelectStatement CurrentSelectStatement { // There is always something on the stack, so we can always Peek. get { return selectStatementStack.Peek(); } } /// <summary> /// Nested joins and extents need to know whether they should create /// a new Select statement, or reuse the parent's. This flag /// indicates whether the parent is a join or not. /// </summary> Stack<bool> isParentAJoinStack; /// <summary> /// The top of the stack /// </summary> private bool IsParentAJoin { // There might be no entry on the stack if a Join node has never // been seen, so we return false in that case. get { return isParentAJoinStack.Count == 0 ? false : isParentAJoinStack.Peek(); } } #endregion #region Global lists and state Dictionary<string, int> allExtentNames; internal Dictionary<string, int> AllExtentNames { get { return allExtentNames; } } // For each column name, we store the last integer suffix that // was added to produce a unique column name. This speeds up // the creation of the next unique name for this column name. Dictionary<string, int> allColumnNames; internal Dictionary<string, int> AllColumnNames { get { return allColumnNames; } } SymbolTable symbolTable = new SymbolTable(); /// <summary> /// VariableReferenceExpressions are allowed only as children of DbPropertyExpression /// or MethodExpression. The cheapest way to ensure this is to set the following /// property in DbVariableReferenceExpression and reset it in the allowed parent expressions. /// </summary> bool isVarRefSingle = false; #endregion private bool HasBuiltMapForIn(DbExpression e, KeyToListMap<DbExpression, DbExpression> values) { DbExpressionKind expressionKind = e.ExpressionKind; if (expressionKind != DbExpressionKind.Equals) { if (expressionKind != DbExpressionKind.IsNull) { if (expressionKind != DbExpressionKind.Or) { return false; } DbBinaryExpression expression2 = e as DbBinaryExpression; return (this.HasBuiltMapForIn(expression2.Left, values) && this.HasBuiltMapForIn(expression2.Right, values)); } } else { return this.TryAddExpressionForIn((DbBinaryExpression)e, values); } DbExpression argument = ((DbIsNullExpression)e).Argument; if (this.IsKeyForIn(argument)) { values.Add(argument, e); return true; } return false; } #region Statics static private readonly Dictionary<string, FunctionHandler> _builtInFunctionHandlers = InitializeBuiltInFunctionHandlers(); static private readonly Dictionary<string, FunctionHandler> _canonicalFunctionHandlers = InitializeCanonicalFunctionHandlers(); static private readonly Dictionary<string, string> _functionNameToOperatorDictionary = InitializeFunctionNameToOperatorDictionary(); static private readonly Dictionary<string, string> _datepartKeywords = InitializeDatepartKeywords(); static private readonly char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; private delegate ISqlFragment FunctionHandler(SqlGenerator sqlgen, DbFunctionExpression functionExpr); /// <summary> /// All special built-in functions and their handlers /// </summary> /// <returns></returns> private static Dictionary<string, FunctionHandler> InitializeBuiltInFunctionHandlers() { Dictionary<string, FunctionHandler> functionHandlers = new Dictionary<string, FunctionHandler>(7, StringComparer.Ordinal); functionHandlers.Add("CONCAT", HandleConcatFunction); functionHandlers.Add("DATEPART", HandleDatepartDateFunction); functionHandlers.Add("DatePart", HandleDatepartDateFunction); functionHandlers.Add("GETDATE", HandleGetDateFunction); functionHandlers.Add("GETUTCDATE", HandleGetUtcDateFunction); return functionHandlers; } /// <summary> /// All special non-aggregate canonical functions and their handlers /// </summary> /// <returns></returns> private static Dictionary<string, FunctionHandler> InitializeCanonicalFunctionHandlers() { Dictionary<string, FunctionHandler> functionHandlers = new Dictionary<string, FunctionHandler>(16, StringComparer.Ordinal); functionHandlers.Add("IndexOf", HandleCanonicalFunctionIndexOf); functionHandlers.Add("Length", HandleCanonicalFunctionLength); functionHandlers.Add("NewGuid", HandleCanonicalFunctionNewGuid); functionHandlers.Add("Round", HandleCanonicalFunctionRound); functionHandlers.Add("ToLower", HandleCanonicalFunctionToLower); functionHandlers.Add("ToUpper", HandleCanonicalFunctionToUpper); functionHandlers.Add("Trim", HandleCanonicalFunctionTrim); functionHandlers.Add("CurrentDateTime", HandleGetDateFunction); functionHandlers.Add("CurrentUtcDateTime", HandleGetUtcDateFunction); //DatePartFunctions functionHandlers.Add("Year", HandleCanonicalFunctionDatepart); functionHandlers.Add("Month", HandleCanonicalFunctionDatepart); functionHandlers.Add("Day", HandleCanonicalFunctionDatepart); functionHandlers.Add("Hour", HandleCanonicalFunctionDatepart); functionHandlers.Add("Minute", HandleCanonicalFunctionDatepart); functionHandlers.Add("Second", HandleCanonicalFunctionDatepart); functionHandlers.Add("DateAdd", HandleCanonicalFunctionDateAdd); functionHandlers.Add("DateDiff", HandleCanonicalFunctionDateSubtract); functionHandlers.Add("DATEADD", HandleCanonicalFunctionDateAdd); // store functionHandlers.Add("DATEDIFF", HandleCanonicalFunctionDateSubtract); // store //Functions that translate to operators functionHandlers.Add("Concat", HandleConcatFunction); functionHandlers.Add("BitwiseAnd", HandleCanonicalFunctionBitwise); functionHandlers.Add("BitwiseNot", HandleCanonicalFunctionBitwise); functionHandlers.Add("BitwiseOr", HandleCanonicalFunctionBitwise); functionHandlers.Add("BitwiseXor", HandleCanonicalFunctionBitwise); return functionHandlers; } /// <summary> /// Valid datepart values /// </summary> /// <returns></returns> private static Dictionary<string, string> InitializeDatepartKeywords() { #region Datepart Keywords // // valid datepart values // Dictionary<string, string> datepartKeywords = new Dictionary<string, string>(30, StringComparer.OrdinalIgnoreCase); datepartKeywords.Add("d", "%d"); datepartKeywords.Add("day", "%d"); datepartKeywords.Add("dayofyear", "%j"); datepartKeywords.Add("dd", "%d"); datepartKeywords.Add("dw", "%w"); datepartKeywords.Add("dy", "%j"); datepartKeywords.Add("hh", "%H"); datepartKeywords.Add("hour", "%H"); datepartKeywords.Add("m", "%m"); datepartKeywords.Add("mi", "%M"); datepartKeywords.Add("millisecond", "%f"); datepartKeywords.Add("minute", "%M"); datepartKeywords.Add("mm", "%m"); datepartKeywords.Add("month", "%m"); datepartKeywords.Add("ms", "%f"); datepartKeywords.Add("n", "%M"); datepartKeywords.Add("s", "%S"); datepartKeywords.Add("second", "%S"); datepartKeywords.Add("ss", "%S"); datepartKeywords.Add("week", "%W"); datepartKeywords.Add("weekday", "%w"); datepartKeywords.Add("wk", "%W"); datepartKeywords.Add("ww", "%W"); datepartKeywords.Add("y", "%Y"); datepartKeywords.Add("year", "%Y"); datepartKeywords.Add("yy", "%Y"); datepartKeywords.Add("yyyy", "%Y"); return datepartKeywords; #endregion } /// <summary> /// Initializes the mapping from functions to T-SQL operators /// for all functions that translate to T-SQL operators /// </summary> /// <returns></returns> private static Dictionary<string, string> InitializeFunctionNameToOperatorDictionary() { Dictionary<string, string> functionNameToOperatorDictionary = new Dictionary<string, string>(5, StringComparer.Ordinal); functionNameToOperatorDictionary.Add("Concat", "||"); //canonical functionNameToOperatorDictionary.Add("CONCAT", "||"); //store functionNameToOperatorDictionary.Add("BitwiseAnd", "&"); functionNameToOperatorDictionary.Add("BitwiseNot", "~"); functionNameToOperatorDictionary.Add("BitwiseOr", "|"); functionNameToOperatorDictionary.Add("BitwiseXor", "^"); return functionNameToOperatorDictionary; } #endregion #region Constructor /// <summary> /// Basic constructor. /// </summary> private SqlGenerator(SQLiteProviderManifest manifest) { _manifest = manifest; } #endregion #region Entry points /// <summary> /// General purpose static function that can be called from System.Data assembly /// </summary> /// <param name="sqlVersion">Server version</param> /// <param name="tree">command tree</param> /// <param name="parameters">Parameters to add to the command tree corresponding /// to constants in the command tree. Used only in ModificationCommandTrees.</param> /// <returns>The string representing the SQL to be executed.</returns> internal static string GenerateSql(SQLiteProviderManifest manifest, DbCommandTree tree, out List<DbParameter> parameters, out CommandType commandType) { commandType = CommandType.Text; //Handle Query DbQueryCommandTree queryCommandTree = tree as DbQueryCommandTree; if (queryCommandTree != null) { SqlGenerator sqlGen = new SqlGenerator(manifest); parameters = null; string sql = sqlGen.GenerateSql((DbQueryCommandTree)tree); return sql; } //Handle Function DbFunctionCommandTree DbFunctionCommandTree = tree as DbFunctionCommandTree; if (DbFunctionCommandTree != null) { SqlGenerator sqlGen = new SqlGenerator(manifest); parameters = null; string sql = sqlGen.GenerateFunctionSql(DbFunctionCommandTree, out commandType); return sql; } //Handle Insert DbInsertCommandTree insertCommandTree = tree as DbInsertCommandTree; if (insertCommandTree != null) { return DmlSqlGenerator.GenerateInsertSql(insertCommandTree, out parameters); } //Handle Delete DbDeleteCommandTree deleteCommandTree = tree as DbDeleteCommandTree; if (deleteCommandTree != null) { return DmlSqlGenerator.GenerateDeleteSql(deleteCommandTree, out parameters); } //Handle Update DbUpdateCommandTree updateCommandTree = tree as DbUpdateCommandTree; if (updateCommandTree != null) { return DmlSqlGenerator.GenerateUpdateSql(updateCommandTree, out parameters); } throw new NotSupportedException("Unrecognized command tree type"); } #endregion //StringBuilder _typeDefs = new StringBuilder(); #region Driver Methods /// <summary> /// Translate a command tree to a SQL string. /// /// The input tree could be translated to either a SQL SELECT statement /// or a SELECT expression. This choice is made based on the return type /// of the expression /// CollectionType => select statement /// non collection type => select expression /// </summary> /// <param name="tree"></param> /// <returns>The string representing the SQL to be executed.</returns> private string GenerateSql(DbQueryCommandTree tree) { tree = SqlChecker.Rewrite(tree); selectStatementStack = new Stack<SqlSelectStatement>(); isParentAJoinStack = new Stack<bool>(); allExtentNames = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase); allColumnNames = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase); // Literals will not be converted to parameters. ISqlFragment result; if (MetadataHelpers.IsCollectionType(tree.Query.ResultType)) { SqlSelectStatement sqlStatement = VisitExpressionEnsureSqlStatement(tree.Query); Debug.Assert(sqlStatement != null, "The outer most sql statment is null"); sqlStatement.IsTopMost = true; result = sqlStatement; } else { SqlBuilder sqlBuilder = new SqlBuilder(); sqlBuilder.Append("SELECT "); sqlBuilder.Append(tree.Query.Accept(this)); result = sqlBuilder; } if (isVarRefSingle) { throw new NotSupportedException(); // A DbVariableReferenceExpression has to be a child of DbPropertyExpression or MethodExpression } // Check that the parameter stacks are not leaking. Debug.Assert(selectStatementStack.Count == 0); Debug.Assert(isParentAJoinStack.Count == 0); //if (_typeDefs.Length > 0) //{ // _typeDefs.Insert(0x0, "TYPES "); // _typeDefs.Append(";\r\n"); // _typeDefs.Append(WriteSql(result)); // return _typeDefs.ToString(); //} return WriteSql(result); } /// <summary> /// Translate a function command tree to a SQL string. /// </summary> private string GenerateFunctionSql(DbFunctionCommandTree tree, out CommandType commandType) { EdmFunction function = tree.EdmFunction; // We expect function to always have these properties string userCommandText = (string)function.MetadataProperties["CommandTextAttribute"].Value; //string userSchemaName = (string)function.MetadataProperties["Schema"].Value; string userFuncName = (string)function.MetadataProperties["StoreFunctionNameAttribute"].Value; if (String.IsNullOrEmpty(userCommandText)) { // build a quoted description of the function commandType = CommandType.StoredProcedure; // if the schema name is not explicitly given, it is assumed to be the metadata namespace //string schemaName = String.IsNullOrEmpty(userSchemaName) ? // function.NamespaceName : userSchemaName; // if the function store name is not explicitly given, it is assumed to be the metadata name string functionName = String.IsNullOrEmpty(userFuncName) ? function.Name : userFuncName; // quote elements of function text //string quotedSchemaName = QuoteIdentifier(schemaName); string quotedFunctionName = QuoteIdentifier(functionName); // separator //const string schemaSeparator = "."; // concatenate elements of function text string quotedFunctionText = /* quotedSchemaName + schemaSeparator + */ quotedFunctionName; return quotedFunctionText; } else { // if the user has specified the command text, pass it through verbatim and choose CommandType.Text commandType = CommandType.Text; return userCommandText; } } /// <summary> /// Convert the SQL fragments to a string. /// We have to setup the Stream for writing. /// </summary> /// <param name="sqlStatement"></param> /// <returns>A string representing the SQL to be executed.</returns> string WriteSql(ISqlFragment sqlStatement) { StringBuilder builder = new StringBuilder(1024); using (SqlWriter writer = new SqlWriter(builder)) { sqlStatement.WriteSql(writer, this); } return builder.ToString(); } #endregion private bool TryTranslateIntoIn(DbOrExpression e, out ISqlFragment sqlFragment) { KeyToListMap<DbExpression, DbExpression> values = new KeyToListMap<DbExpression, DbExpression>(KeyFieldExpressionComparer.Singleton); if (!(this.HasBuiltMapForIn(e, values) && (values.Keys.Count<DbExpression>() > 0))) { sqlFragment = null; return false; } SqlBuilder result = new SqlBuilder(); bool flag2 = true; foreach (DbExpression expression in values.Keys) { ReadOnlyCollection<DbExpression> source = values.ListForKey(expression); if (!flag2) { result.Append(" OR "); } else { flag2 = false; } IEnumerable<DbExpression> enumerable = source.Where<DbExpression>(delegate(DbExpression v) { return v.ExpressionKind != DbExpressionKind.IsNull; }); int num = enumerable.Count<DbExpression>(); if (num == 1) { this.ParanthesizeExpressionIfNeeded(expression, result); result.Append(" = "); DbExpression expression2 = enumerable.First<DbExpression>(); this.ParenthesizeExpressionWithoutRedundantConstantCasts(expression2, result); } if (num > 1) { this.ParanthesizeExpressionIfNeeded(expression, result); result.Append(" IN ("); bool flag3 = true; foreach (DbExpression expression3 in enumerable) { if (!flag3) { result.Append(","); } else { flag3 = false; } this.ParenthesizeExpressionWithoutRedundantConstantCasts(expression3, result); } result.Append(")"); } DbIsNullExpression expression4 = source.FirstOrDefault<DbExpression>(delegate(DbExpression v) { return (v.ExpressionKind == DbExpressionKind.IsNull); }) as DbIsNullExpression; if (expression4 != null) { if (num > 0) { result.Append(" OR "); } result.Append(this.VisitIsNullExpression(expression4, false)); } } sqlFragment = result; return true; } #region DbExpressionVisitor Members /// <summary> /// Translate(left) AND Translate(right) /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/>.</returns> public override ISqlFragment Visit(DbAndExpression e) { return VisitBinaryExpression(" AND ", e.Left, e.Right); } /// <summary> /// An apply is just like a join, so it shares the common join processing /// in <see cref="VisitJoinExpression"/> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/>.</returns> public override ISqlFragment Visit(DbApplyExpression e) { throw new NotSupportedException("APPLY joins are not supported"); } /// <summary> /// For binary expressions, we delegate to <see cref="VisitBinaryExpression"/>. /// We handle the other expressions directly. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbArithmeticExpression e) { SqlBuilder result; switch (e.ExpressionKind) { case DbExpressionKind.Divide: result = VisitBinaryExpression(" / ", e.Arguments[0], e.Arguments[1]); break; case DbExpressionKind.Minus: result = VisitBinaryExpression(" - ", e.Arguments[0], e.Arguments[1]); break; case DbExpressionKind.Modulo: result = VisitBinaryExpression(" % ", e.Arguments[0], e.Arguments[1]); break; case DbExpressionKind.Multiply: result = VisitBinaryExpression(" * ", e.Arguments[0], e.Arguments[1]); break; case DbExpressionKind.Plus: result = VisitBinaryExpression(" + ", e.Arguments[0], e.Arguments[1]); break; case DbExpressionKind.UnaryMinus: result = new SqlBuilder(); result.Append(" -("); result.Append(e.Arguments[0].Accept(this)); result.Append(")"); break; default: Debug.Assert(false); throw new InvalidOperationException(); } return result; } /// <summary> /// If the ELSE clause is null, we do not write it out. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbCaseExpression e) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.When.Count == e.Then.Count); result.Append("CASE"); for (int i = 0; i < e.When.Count; ++i) { result.Append(" WHEN ("); result.Append(e.When[i].Accept(this)); result.Append(") THEN "); result.Append(e.Then[i].Accept(this)); } if (e.Else != null && !(e.Else is DbNullExpression)) { result.Append(" ELSE "); result.Append(e.Else.Accept(this)); } result.Append(" END"); return result; } /// <summary> /// /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbCastExpression e) { SqlBuilder result = new SqlBuilder(); result.Append(e.Argument.Accept(this)); return result; } /// <summary> /// The parser generates Not(Equals(...)) for <>. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/>.</returns> public override ISqlFragment Visit(DbComparisonExpression e) { SqlBuilder result; switch (e.ExpressionKind) { case DbExpressionKind.Equals: result = VisitBinaryExpression(" = ", e.Left, e.Right); break; case DbExpressionKind.LessThan: result = VisitBinaryExpression(" < ", e.Left, e.Right); break; case DbExpressionKind.LessThanOrEquals: result = VisitBinaryExpression(" <= ", e.Left, e.Right); break; case DbExpressionKind.GreaterThan: result = VisitBinaryExpression(" > ", e.Left, e.Right); break; case DbExpressionKind.GreaterThanOrEquals: result = VisitBinaryExpression(" >= ", e.Left, e.Right); break; // The parser does not generate the expression kind below. case DbExpressionKind.NotEquals: result = VisitBinaryExpression(" <> ", e.Left, e.Right); break; default: throw new InvalidOperationException(); } return result; } /// <summary> /// Constants will be send to the store as part of the generated TSQL, not as parameters /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/>. Strings are wrapped in single /// quotes and escaped. Numbers are written literally.</returns> public override ISqlFragment Visit(DbConstantExpression e) { SqlBuilder result = new SqlBuilder(); PrimitiveTypeKind typeKind; // Model Types can be (at the time of this implementation): // Binary, Boolean, Byte, DateTime, Decimal, Double, Guid, Int16, Int32, Int64,Single, String if (MetadataHelpers.TryGetPrimitiveTypeKind(e.ResultType, out typeKind)) { switch (typeKind) { case PrimitiveTypeKind.Int32: result.Append(e.Value.ToString()); break; case PrimitiveTypeKind.Binary: result.Append(" X'"); result.Append(ByteArrayToBinaryString((Byte[])e.Value)); result.Append("' "); break; case PrimitiveTypeKind.Boolean: result.Append((bool)e.Value ? "1" : "0"); break; case PrimitiveTypeKind.Byte: result.Append(e.Value.ToString()); break; case PrimitiveTypeKind.DateTime: result.Append(EscapeSingleQuote(((System.DateTime)e.Value).ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture), false /* IsUnicode */)); break; case PrimitiveTypeKind.Decimal: string strDecimal = ((Decimal)e.Value).ToString(CultureInfo.InvariantCulture); // if the decimal value has no decimal part, cast as decimal to preserve type // if the number has precision > int64 max precision, it will be handled as decimal by sql server // and does not need cast. if precision is lest then 20, then cast using Max(literal precision, sql default precision) if (-1 == strDecimal.IndexOf('.') && (strDecimal.TrimStart(new char[] { '-' }).Length < 20)) { byte precision = (Byte)strDecimal.Length; FacetDescription precisionFacetDescription; Debug.Assert(MetadataHelpers.TryGetTypeFacetDescriptionByName(e.ResultType.EdmType, "precision", out precisionFacetDescription), "Decimal primitive type must have Precision facet"); if (MetadataHelpers.TryGetTypeFacetDescriptionByName(e.ResultType.EdmType, "precision", out precisionFacetDescription)) { if (precisionFacetDescription.DefaultValue != null) { precision = Math.Max(precision, (byte)precisionFacetDescription.DefaultValue); } } Debug.Assert(precision > 0, "Precision must be greater than zero"); result.Append(strDecimal); } else { result.Append(strDecimal); } break; case PrimitiveTypeKind.Double: result.Append(((Double)e.Value).ToString(CultureInfo.InvariantCulture)); break; case PrimitiveTypeKind.Guid: result.Append(EscapeSingleQuote(e.Value.ToString(), false /* IsUnicode */)); break; case PrimitiveTypeKind.Int16: result.Append(e.Value.ToString()); break; case PrimitiveTypeKind.Int64: result.Append(e.Value.ToString()); break; case PrimitiveTypeKind.Single: result.Append(((Single)e.Value).ToString(CultureInfo.InvariantCulture)); break; case PrimitiveTypeKind.String: bool isUnicode = MetadataHelpers.GetFacetValueOrDefault<bool>(e.ResultType, MetadataHelpers.UnicodeFacetName, true); result.Append(EscapeSingleQuote(e.Value as string, isUnicode)); break; case PrimitiveTypeKind.DateTimeOffset: throw new NotSupportedException("datetimeoffset"); case PrimitiveTypeKind.Time: throw new NotSupportedException("time"); default: // all known scalar types should been handled already. throw new NotSupportedException(); } } else { throw new NotSupportedException(); } return result; } /// <summary> /// <see cref="DbDerefExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbDerefExpression e) { throw new NotSupportedException(); } /// <summary> /// The DISTINCT has to be added to the beginning of SqlSelectStatement.Select, /// but it might be too late for that. So, we use a flag on SqlSelectStatement /// instead, and add the "DISTINCT" in the second phase. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/></returns> public override ISqlFragment Visit(DbDistinctExpression e) { SqlSelectStatement result = VisitExpressionEnsureSqlStatement(e.Argument); if (!IsCompatible(result, e.ExpressionKind)) { Symbol fromSymbol; TypeUsage inputType = MetadataHelpers.GetElementTypeUsage(e.Argument.ResultType); result = CreateNewSelectStatement(result, "DISTINCT", inputType, out fromSymbol); AddFromSymbol(result, "DISTINCT", fromSymbol, false); } result.IsDistinct = true; return result; } /// <summary> /// An element expression returns a scalar - so it is translated to /// ( Select ... ) /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbElementExpression e) { SqlBuilder result = new SqlBuilder(); result.Append("("); result.Append(VisitExpressionEnsureSqlStatement(e.Argument)); result.Append(")"); return result; } /// <summary> /// <see cref="Visit(DbUnionAllExpression)"/> /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbExceptExpression e) { return VisitSetOpExpression(e.Left, e.Right, "EXCEPT"); } /// <summary> /// Only concrete expression types will be visited. /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbExpression e) { throw new InvalidOperationException(); } /// <summary> /// /// </summary> /// <param name="e"></param> /// <returns>If we are in a Join context, returns a <see cref="SqlBuilder"/> /// with the extent name, otherwise, a new <see cref="SqlSelectStatement"/> /// with the From field set.</returns> public override ISqlFragment Visit(DbScanExpression e) { EntitySetBase target = e.Target; if (IsParentAJoin) { SqlBuilder result = new SqlBuilder(); result.Append(GetTargetTSql(target)); return result; } else { SqlSelectStatement result = new SqlSelectStatement(); result.From.Append(GetTargetTSql(target)); return result; } } /// <summary> /// Gets escaped TSql identifier describing this entity set. /// </summary> /// <returns></returns> internal static string GetTargetTSql(EntitySetBase entitySetBase) { // construct escaped T-SQL referencing entity set StringBuilder builder = new StringBuilder(50); string definingQuery = MetadataHelpers.TryGetValueForMetadataProperty<string>(entitySetBase, "DefiningQuery"); if (!string.IsNullOrEmpty(definingQuery)) { //definingQuery = definingQuery.TrimStart(' ', '\t', '\r', '\n'); //if (String.Compare(definingQuery, 0, "TYPES ", 0, 6, StringComparison.OrdinalIgnoreCase) == 0) // definingQuery = definingQuery.Substring(definingQuery.IndexOf(';') + 1).TrimStart(' ', '\t', '\r', '\n'); builder.Append("("); builder.Append(definingQuery); builder.Append(")"); } else { //string schemaName = MetadataHelpers.TryGetValueForMetadataProperty<string>(entitySetBase, "Schema"); //if (!string.IsNullOrEmpty(schemaName)) //{ // builder.Append(SqlGenerator.QuoteIdentifier(schemaName)); // builder.Append("."); //} string tableName = MetadataHelpers.TryGetValueForMetadataProperty<string>(entitySetBase, "Table"); if (!string.IsNullOrEmpty(tableName)) { builder.Append(SqlGenerator.QuoteIdentifier(tableName)); } else { builder.Append(SqlGenerator.QuoteIdentifier(entitySetBase.Name)); } } return builder.ToString(); } /// <summary> /// The bodies of <see cref="Visit(DbFilterExpression)"/>, <see cref="Visit(DbGroupByExpression)"/>, /// <see cref="Visit(DbProjectExpression)"/>, <see cref="Visit(DbSortExpression)"/> are similar. /// Each does the following. /// <list type="number"> /// <item> Visit the input expression</item> /// <item> Determine if the input's SQL statement can be reused, or a new /// one must be created.</item> /// <item>Create a new symbol table scope</item> /// <item>Push the Sql statement onto a stack, so that children can /// update the free variable list.</item> /// <item>Visit the non-input expression.</item> /// <item>Cleanup</item> /// </list> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/></returns> public override ISqlFragment Visit(DbFilterExpression e) { return VisitFilterExpression(e.Input, e.Predicate, false); } /// <summary> /// Lambda functions are not supported. /// The functions supported are: /// <list type="number"> /// <item>Canonical Functions - We recognize these by their dataspace, it is DataSpace.CSpace</item> /// <item>Store Functions - We recognize these by the BuiltInAttribute and not being Canonical</item> /// <item>User-defined Functions - All the rest except for Lambda functions</item> /// </list> /// We handle Canonical and Store functions the same way: If they are in the list of functions /// that need special handling, we invoke the appropriate handler, otherwise we translate them to /// FunctionName(arg1, arg2, ..., argn). /// We translate user-defined functions to NamespaceName.FunctionName(arg1, arg2, ..., argn). /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbFunctionExpression e) { // // check if function requires special case processing, if so, delegates to it // if (IsSpecialBuiltInFunction(e)) { return HandleSpecialBuiltInFunction(e); } if (IsSpecialCanonicalFunction(e)) { return HandleSpecialCanonicalFunction(e); } return HandleFunctionDefault(e); } /// <summary> /// <see cref="DbEntityRefExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbEntityRefExpression e) { throw new NotSupportedException(); } /// <summary> /// <see cref="DbRefKeyExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbRefKeyExpression e) { throw new NotSupportedException(); } /// <summary> /// <see cref="Visit(DbFilterExpression)"/> for general details. /// We modify both the GroupBy and the Select fields of the SqlSelectStatement. /// GroupBy gets just the keys without aliases, /// and Select gets the keys and the aggregates with aliases. /// /// Whenever there exists at least one aggregate with an argument that is not is not a simple /// <see cref="DbPropertyExpression"/> over <see cref="DbVariableReferenceExpression"/>, /// we create a nested query in which we alias the arguments to the aggregates. /// That is due to the following two limitations of Sql Server: /// <list type="number"> /// <item>If an expression being aggregated contains an outer reference, then that outer /// reference must be the only column referenced in the expression </item> /// <item>Sql Server cannot perform an aggregate function on an expression containing /// an aggregate or a subquery. </item> /// </list> /// /// The default translation, without inner query is: /// /// SELECT /// kexp1 AS key1, kexp2 AS key2,... kexpn AS keyn, /// aggf1(aexpr1) AS agg1, .. aggfn(aexprn) AS aggn /// FROM input AS a /// GROUP BY kexp1, kexp2, .. kexpn /// /// When we inject an innner query, the equivalent translation is: /// /// SELECT /// key1 AS key1, key2 AS key2, .. keyn AS keys, /// aggf1(agg1) AS agg1, aggfn(aggn) AS aggn /// FROM ( /// SELECT /// kexp1 AS key1, kexp2 AS key2,... kexpn AS keyn, /// aexpr1 AS agg1, .. aexprn AS aggn /// FROM input AS a /// ) as a /// GROUP BY key1, key2, keyn /// /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/></returns> public override ISqlFragment Visit(DbGroupByExpression e) { Symbol fromSymbol; //SqlSelectStatement result = VisitInputExpression(e.Input.Expression, SqlSelectStatement innerQuery = VisitInputExpression(e.Input.Expression, e.Input.VariableName, e.Input.VariableType, out fromSymbol); // GroupBy is compatible with Filter and OrderBy // but not with Project, GroupBy if (!IsCompatible(innerQuery, e.ExpressionKind)) { innerQuery = CreateNewSelectStatement(innerQuery, e.Input.VariableName, e.Input.VariableType, out fromSymbol); } selectStatementStack.Push(innerQuery); symbolTable.EnterScope(); AddFromSymbol(innerQuery, e.Input.VariableName, fromSymbol); // This line is not present for other relational nodes. symbolTable.Add(e.Input.GroupVariableName, fromSymbol); // The enumerator is shared by both the keys and the aggregates, // so, we do not close it in between. RowType groupByType = MetadataHelpers.GetEdmType<RowType>(MetadataHelpers.GetEdmType<CollectionType>(e.ResultType).TypeUsage); //Whenever there exists at least one aggregate with an argument that is not simply a PropertyExpression // over a VarRefExpression, we need a nested query in which we alias the arguments to the aggregates. bool needsInnerQuery = NeedsInnerQuery(e.Aggregates); SqlSelectStatement result; if (needsInnerQuery) { //Create the inner query result = CreateNewSelectStatement(innerQuery, e.Input.VariableName, e.Input.VariableType, false, out fromSymbol); AddFromSymbol(result, e.Input.VariableName, fromSymbol, false); } else { result = innerQuery; } using (IEnumerator<EdmProperty> members = groupByType.Properties.GetEnumerator()) { members.MoveNext(); Debug.Assert(result.Select.IsEmpty); string separator = ""; foreach (DbExpression key in e.Keys) { EdmProperty member = members.Current; string alias = QuoteIdentifier(member.Name); result.GroupBy.Append(separator); ISqlFragment keySql = key.Accept(this); if (!needsInnerQuery) { //Default translation: Key AS Alias result.Select.Append(separator); result.Select.AppendLine(); result.Select.Append(keySql); result.Select.Append(" AS "); result.Select.Append(alias); result.GroupBy.Append(keySql); } else { // The inner query contains the default translation Key AS Alias innerQuery.Select.Append(separator); innerQuery.Select.AppendLine(); innerQuery.Select.Append(keySql); innerQuery.Select.Append(" AS "); innerQuery.Select.Append(alias); //The outer resulting query projects over the key aliased in the inner query: // fromSymbol.Alias AS Alias result.Select.Append(separator); result.Select.AppendLine(); result.Select.Append(fromSymbol); result.Select.Append("."); result.Select.Append(alias); result.Select.Append(" AS "); result.Select.Append(alias); result.GroupBy.Append(alias); } separator = ", "; members.MoveNext(); } foreach (DbAggregate aggregate in e.Aggregates) { EdmProperty member = members.Current; string alias = QuoteIdentifier(member.Name); Debug.Assert(aggregate.Arguments.Count == 1); ISqlFragment translatedAggregateArgument = aggregate.Arguments[0].Accept(this); object aggregateArgument; if (needsInnerQuery) { //In this case the argument to the aggratete is reference to the one projected out by the // inner query SqlBuilder wrappingAggregateArgument = new SqlBuilder(); wrappingAggregateArgument.Append(fromSymbol); wrappingAggregateArgument.Append("."); wrappingAggregateArgument.Append(alias); aggregateArgument = wrappingAggregateArgument; innerQuery.Select.Append(separator); innerQuery.Select.AppendLine(); innerQuery.Select.Append(translatedAggregateArgument); innerQuery.Select.Append(" AS "); innerQuery.Select.Append(alias); } else { aggregateArgument = translatedAggregateArgument; } ISqlFragment aggregateResult = VisitAggregate(aggregate, aggregateArgument); result.Select.Append(separator); result.Select.AppendLine(); result.Select.Append(aggregateResult); result.Select.Append(" AS "); result.Select.Append(alias); separator = ", "; members.MoveNext(); } } symbolTable.ExitScope(); selectStatementStack.Pop(); return result; } /// <summary> /// <see cref="Visit(DbUnionAllExpression)"/> /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbIntersectExpression e) { return VisitSetOpExpression(e.Left, e.Right, "INTERSECT"); } /// <summary> /// Not(IsEmpty) has to be handled specially, so we delegate to /// <see cref="VisitIsEmptyExpression"/>. /// /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/>. /// <code>[NOT] EXISTS( ... )</code> /// </returns> public override ISqlFragment Visit(DbIsEmptyExpression e) { return VisitIsEmptyExpression(e, false); } /// <summary> /// Not(IsNull) is handled specially, so we delegate to /// <see cref="VisitIsNullExpression"/> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/> /// <code>IS [NOT] NULL</code> /// </returns> public override ISqlFragment Visit(DbIsNullExpression e) { return VisitIsNullExpression(e, false); } /// <summary> /// <see cref="DbIsOfExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbIsOfExpression e) { throw new NotSupportedException(); } /// <summary> /// <see cref="VisitJoinExpression"/> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/>.</returns> public override ISqlFragment Visit(DbCrossJoinExpression e) { return VisitJoinExpression(e.Inputs, e.ExpressionKind, "CROSS JOIN", null); } /// <summary> /// <see cref="VisitJoinExpression"/> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/>.</returns> public override ISqlFragment Visit(DbJoinExpression e) { #region Map join type to a string string joinString; switch (e.ExpressionKind) { case DbExpressionKind.FullOuterJoin: joinString = "FULL OUTER JOIN"; break; case DbExpressionKind.InnerJoin: joinString = "INNER JOIN"; break; case DbExpressionKind.LeftOuterJoin: joinString = "LEFT OUTER JOIN"; break; default: Debug.Assert(false); joinString = null; break; } #endregion List<DbExpressionBinding> inputs = new List<DbExpressionBinding>(2); inputs.Add(e.Left); inputs.Add(e.Right); return VisitJoinExpression(inputs, e.ExpressionKind, joinString, e.JoinCondition); } /// <summary> /// /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbLikeExpression e) { SqlBuilder result = new SqlBuilder(); result.Append(e.Argument.Accept(this)); result.Append(" LIKE "); result.Append(e.Pattern.Accept(this)); // if the ESCAPE expression is a DbNullExpression, then that's tantamount to // not having an ESCAPE at all if (e.Escape.ExpressionKind != DbExpressionKind.Null) { result.Append(" ESCAPE "); result.Append(e.Escape.Accept(this)); } return result; } /// <summary> /// Translates to TOP expression. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbLimitExpression e) { Debug.Assert(e.Limit is DbConstantExpression || e.Limit is DbParameterReferenceExpression, "DbLimitExpression.Limit is of invalid expression type"); SqlSelectStatement result = VisitExpressionEnsureSqlStatement(e.Argument, false); Symbol fromSymbol; if (!IsCompatible(result, e.ExpressionKind)) { TypeUsage inputType = MetadataHelpers.GetElementTypeUsage(e.Argument.ResultType); result = CreateNewSelectStatement(result, "top", inputType, out fromSymbol); AddFromSymbol(result, "top", fromSymbol, false); } ISqlFragment topCount = HandleCountExpression(e.Limit); result.Top = new TopClause(topCount, e.WithTies); return result; } /// <summary> /// DbNewInstanceExpression is allowed as a child of DbProjectExpression only. /// If anyone else is the parent, we throw. /// We also perform special casing for collections - where we could convert /// them into Unions /// /// <see cref="VisitNewInstanceExpression"/> for the actual implementation. /// /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbNewInstanceExpression e) { if (MetadataHelpers.IsCollectionType(e.ResultType)) { return VisitCollectionConstructor(e); } throw new NotSupportedException(); } /// <summary> /// The Not expression may cause the translation of its child to change. /// These children are /// <list type="bullet"> /// <item><see cref="DbNotExpression"/>NOT(Not(x)) becomes x</item> /// <item><see cref="DbIsEmptyExpression"/>NOT EXISTS becomes EXISTS</item> /// <item><see cref="DbIsNullExpression"/>IS NULL becomes IS NOT NULL</item> /// <item><see cref="DbComparisonExpression"/>= becomes<> </item> /// </list> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbNotExpression e) { // Flatten Not(Not(x)) to x. DbNotExpression notExpression = e.Argument as DbNotExpression; if (notExpression != null) { return notExpression.Argument.Accept(this); } DbIsEmptyExpression isEmptyExpression = e.Argument as DbIsEmptyExpression; if (isEmptyExpression != null) { return VisitIsEmptyExpression(isEmptyExpression, true); } DbIsNullExpression isNullExpression = e.Argument as DbIsNullExpression; if (isNullExpression != null) { return VisitIsNullExpression(isNullExpression, true); } DbComparisonExpression comparisonExpression = e.Argument as DbComparisonExpression; if (comparisonExpression != null) { if (comparisonExpression.ExpressionKind == DbExpressionKind.Equals) { return VisitBinaryExpression(" <> ", comparisonExpression.Left, comparisonExpression.Right); } } SqlBuilder result = new SqlBuilder(); result.Append(" NOT ("); result.Append(e.Argument.Accept(this)); result.Append(")"); return result; } /// <summary> /// </summary> /// <param name="e"></param> /// <returns><see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbNullExpression e) { SqlBuilder result = new SqlBuilder(); // always cast nulls - sqlserver doesn't like case expressions where the "then" clause is null result.Append("NULL"); return result; } /// <summary> /// <see cref="DbOfTypeExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbOfTypeExpression e) { throw new NotSupportedException(); } /// <summary> /// /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> /// <seealso cref="Visit(DbAndExpression)"/> public override ISqlFragment Visit(DbOrExpression e) { ISqlFragment sqlFragment = null; if (this.TryTranslateIntoIn(e, out sqlFragment)) { return sqlFragment; } return VisitBinaryExpression(" OR ", e.Left, e.Right); } /// <summary> /// /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbParameterReferenceExpression e) { SqlBuilder result = new SqlBuilder(); // Do not quote this name. // We are not checking that e.Name has no illegal characters. e.g. space result.Append("@" + e.ParameterName); return result; } /// <summary> /// <see cref="Visit(DbFilterExpression)"/> for the general ideas. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/></returns> /// <seealso cref="Visit(DbFilterExpression)"/> public override ISqlFragment Visit(DbProjectExpression e) { Symbol fromSymbol; SqlSelectStatement result = VisitInputExpression(e.Input.Expression, e.Input.VariableName, e.Input.VariableType, out fromSymbol); // Project is compatible with Filter // but not with Project, GroupBy if (!IsCompatible(result, e.ExpressionKind)) { result = CreateNewSelectStatement(result, e.Input.VariableName, e.Input.VariableType, out fromSymbol); } selectStatementStack.Push(result); symbolTable.EnterScope(); AddFromSymbol(result, e.Input.VariableName, fromSymbol); // Project is the only node that can have DbNewInstanceExpression as a child // so we have to check it here. // We call VisitNewInstanceExpression instead of Visit(DbNewInstanceExpression), since // the latter throws. DbNewInstanceExpression newInstanceExpression = e.Projection as DbNewInstanceExpression; if (newInstanceExpression != null) { result.Select.Append(VisitNewInstanceExpression(newInstanceExpression)); } else { result.Select.Append(e.Projection.Accept(this)); } symbolTable.ExitScope(); selectStatementStack.Pop(); return result; } /// <summary> /// This method handles record flattening, which works as follows. /// consider an expression <c>Prop(y, Prop(x, Prop(d, Prop(c, Prop(b, Var(a)))))</c> /// where a,b,c are joins, d is an extent and x and y are fields. /// b has been flattened into a, and has its own SELECT statement. /// c has been flattened into b. /// d has been flattened into c. /// /// We visit the instance, so we reach Var(a) first. This gives us a (join)symbol. /// Symbol(a).b gives us a join symbol, with a SELECT statement i.e. Symbol(b). /// From this point on , we need to remember Symbol(b) as the source alias, /// and then try to find the column. So, we use a SymbolPair. /// /// We have reached the end when the symbol no longer points to a join symbol. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="JoinSymbol"/> if we have not reached the first /// Join node that has a SELECT statement. /// A <see cref="SymbolPair"/> if we have seen the JoinNode, and it has /// a SELECT statement. /// A <see cref="SqlBuilder"/> with {Input}.propertyName otherwise. /// </returns> public override ISqlFragment Visit(DbPropertyExpression e) { SqlBuilder result; ISqlFragment instanceSql = e.Instance.Accept(this); // Since the DbVariableReferenceExpression is a proper child of ours, we can reset // isVarSingle. DbVariableReferenceExpression DbVariableReferenceExpression = e.Instance as DbVariableReferenceExpression; if (DbVariableReferenceExpression != null) { isVarRefSingle = false; } // We need to flatten, and have not yet seen the first nested SELECT statement. JoinSymbol joinSymbol = instanceSql as JoinSymbol; if (joinSymbol != null) { Debug.Assert(joinSymbol.NameToExtent.ContainsKey(e.Property.Name)); if (joinSymbol.IsNestedJoin) { return new SymbolPair(joinSymbol, joinSymbol.NameToExtent[e.Property.Name]); } else { return joinSymbol.NameToExtent[e.Property.Name]; } } // --------------------------------------- // We have seen the first nested SELECT statement, but not the column. SymbolPair symbolPair = instanceSql as SymbolPair; if (symbolPair != null) { JoinSymbol columnJoinSymbol = symbolPair.Column as JoinSymbol; if (columnJoinSymbol != null) { symbolPair.Column = columnJoinSymbol.NameToExtent[e.Property.Name]; return symbolPair; } else { // symbolPair.Column has the base extent. // we need the symbol for the column, since it might have been renamed // when handling a JOIN. if (symbolPair.Column.Columns.ContainsKey(e.Property.Name)) { result = new SqlBuilder(); result.Append(symbolPair.Source); result.Append("."); result.Append(symbolPair.Column.Columns[e.Property.Name]); return result; } } } // --------------------------------------- result = new SqlBuilder(); result.Append(instanceSql); result.Append("."); // At this point the column name cannot be renamed, so we do // not use a symbol. result.Append(QuoteIdentifier(e.Property.Name)); return result; } /// <summary> /// Any(input, x) => Exists(Filter(input,x)) /// All(input, x) => Not Exists(Filter(input, not(x)) /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbQuantifierExpression e) { SqlBuilder result = new SqlBuilder(); bool negatePredicate = (e.ExpressionKind == DbExpressionKind.All); if (e.ExpressionKind == DbExpressionKind.Any) { result.Append("EXISTS ("); } else { Debug.Assert(e.ExpressionKind == DbExpressionKind.All); result.Append("NOT EXISTS ("); } SqlSelectStatement filter = VisitFilterExpression(e.Input, e.Predicate, negatePredicate); if (filter.Select.IsEmpty) { AddDefaultColumns(filter); } result.Append(filter); result.Append(")"); return result; } /// <summary> /// <see cref="DbRefExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbRefExpression e) { throw new NotSupportedException(); } /// <summary> /// <see cref="DbRelationshipNavigationExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbRelationshipNavigationExpression e) { throw new NotSupportedException(); } /// <summary> /// For Sql9 it translates to: /// SELECT Y.x1, Y.x2, ..., Y.xn /// FROM ( /// SELECT X.x1, X.x2, ..., X.xn, row_number() OVER (ORDER BY sk1, sk2, ...) AS [row_number] /// FROM input as X /// ) as Y /// WHERE Y.[row_number] > count /// ORDER BY sk1, sk2, ... /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbSkipExpression e) { // Should never get here. The Sql2000 rewriter would've rewritten the command tree not to use this throw new NotSupportedException(); } /// <summary> /// <see cref="Visit(DbFilterExpression)"/> /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlSelectStatement"/></returns> /// <seealso cref="Visit(DbFilterExpression)"/> public override ISqlFragment Visit(DbSortExpression e) { Symbol fromSymbol; SqlSelectStatement result = VisitInputExpression(e.Input.Expression, e.Input.VariableName, e.Input.VariableType, out fromSymbol); // OrderBy is compatible with Filter // and nothing else if (!IsCompatible(result, e.ExpressionKind)) { result = CreateNewSelectStatement(result, e.Input.VariableName, e.Input.VariableType, out fromSymbol); } selectStatementStack.Push(result); symbolTable.EnterScope(); AddFromSymbol(result, e.Input.VariableName, fromSymbol); AddSortKeys(result.OrderBy, e.SortOrder); symbolTable.ExitScope(); selectStatementStack.Pop(); return result; } /// <summary> /// <see cref="DbTreatExpression"/> is illegal at this stage /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> public override ISqlFragment Visit(DbTreatExpression e) { throw new NotSupportedException(); } /// <summary> /// This code is shared by <see cref="Visit(DbExceptExpression)"/> /// and <see cref="Visit(DbIntersectExpression)"/> /// /// <see cref="VisitSetOpExpression"/> /// Since the left and right expression may not be Sql select statements, /// we must wrap them up to look like SQL select statements. /// </summary> /// <param name="e"></param> /// <returns></returns> public override ISqlFragment Visit(DbUnionAllExpression e) { return VisitSetOpExpression(e.Left, e.Right, "UNION ALL"); } /// <summary> /// This method determines whether an extent from an outer scope(free variable) /// is used in the CurrentSelectStatement. /// /// An extent in an outer scope, if its symbol is not in the FromExtents /// of the CurrentSelectStatement. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="Symbol"/>.</returns> public override ISqlFragment Visit(DbVariableReferenceExpression e) { if (isVarRefSingle) { throw new NotSupportedException(); // A DbVariableReferenceExpression has to be a child of DbPropertyExpression or MethodExpression // This is also checked in GenerateSql(...) at the end of the visiting. } isVarRefSingle = true; // This will be reset by DbPropertyExpression or MethodExpression Symbol result = symbolTable.Lookup(e.VariableName); if (!CurrentSelectStatement.FromExtents.Contains(result)) { CurrentSelectStatement.OuterExtents[result] = true; } return result; } #region Visits shared by multiple nodes /// <summary> /// Aggregates are not visited by the normal visitor walk. /// </summary> /// <param name="aggregate">The aggreate to be translated</param> /// <param name="aggregateArgument">The translated aggregate argument</param> /// <returns></returns> SqlBuilder VisitAggregate(DbAggregate aggregate, object aggregateArgument) { SqlBuilder aggregateResult = new SqlBuilder(); DbFunctionAggregate functionAggregate = aggregate as DbFunctionAggregate; if (functionAggregate == null) { throw new NotSupportedException(); } //The only aggregate function with different name is Big_Count //Note: If another such function is to be added, a dictionary should be created //if (MetadataHelpers.IsCanonicalFunction(functionAggregate.Function) // && String.Equals(functionAggregate.Function.Name, "BigCount", StringComparison.Ordinal)) //{ // aggregateResult.Append("COUNT_BIG"); //} //else { WriteFunctionName(aggregateResult, functionAggregate.Function); } aggregateResult.Append("("); DbFunctionAggregate fnAggr = functionAggregate; if ((null != fnAggr) && (fnAggr.Distinct)) { aggregateResult.Append("DISTINCT "); } aggregateResult.Append(aggregateArgument); aggregateResult.Append(")"); return aggregateResult; } SqlBuilder VisitBinaryExpression(string op, DbExpression left, DbExpression right) { SqlBuilder result = new SqlBuilder(); if (IsComplexExpression(left)) { result.Append("("); } result.Append(left.Accept(this)); if (IsComplexExpression(left)) { result.Append(")"); } result.Append(op); if (IsComplexExpression(right)) { result.Append("("); } result.Append(right.Accept(this)); if (IsComplexExpression(right)) { result.Append(")"); } return result; } /// <summary> /// This is called by the relational nodes. It does the following /// <list> /// <item>If the input is not a SqlSelectStatement, it assumes that the input /// is a collection expression, and creates a new SqlSelectStatement </item> /// </list> /// </summary> /// <param name="inputExpression"></param> /// <param name="inputVarName"></param> /// <param name="inputVarType"></param> /// <param name="fromSymbol"></param> /// <returns>A <see cref="SqlSelectStatement"/> and the main fromSymbol /// for this select statement.</returns> SqlSelectStatement VisitInputExpression(DbExpression inputExpression, string inputVarName, TypeUsage inputVarType, out Symbol fromSymbol) { SqlSelectStatement result; ISqlFragment sqlFragment = inputExpression.Accept(this); result = sqlFragment as SqlSelectStatement; if (result == null) { result = new SqlSelectStatement(); WrapNonQueryExtent(result, sqlFragment, inputExpression.ExpressionKind); } if (result.FromExtents.Count == 0) { // input was an extent fromSymbol = new Symbol(inputVarName, inputVarType); } else if (result.FromExtents.Count == 1) { // input was Filter/GroupBy/Project/OrderBy // we are likely to reuse this statement. fromSymbol = result.FromExtents[0]; } else { // input was a join. // we are reusing the select statement produced by a Join node // we need to remove the original extents, and replace them with a // new extent with just the Join symbol. JoinSymbol joinSymbol = new JoinSymbol(inputVarName, inputVarType, result.FromExtents); joinSymbol.FlattenedExtentList = result.AllJoinExtents; fromSymbol = joinSymbol; result.FromExtents.Clear(); result.FromExtents.Add(fromSymbol); } return result; } /// <summary> /// <see cref="Visit(DbIsEmptyExpression)"/> /// </summary> /// <param name="e"></param> /// <param name="negate">Was the parent a DbNotExpression?</param> /// <returns></returns> SqlBuilder VisitIsEmptyExpression(DbIsEmptyExpression e, bool negate) { SqlBuilder result = new SqlBuilder(); if (!negate) { result.Append(" NOT"); } result.Append(" EXISTS ("); result.Append(VisitExpressionEnsureSqlStatement(e.Argument)); result.AppendLine(); result.Append(")"); return result; } /// <summary> /// Translate a NewInstance(Element(X)) expression into /// "select top(1) * from X" /// </summary> /// <param name="e"></param> /// <returns></returns> private ISqlFragment VisitCollectionConstructor(DbNewInstanceExpression e) { Debug.Assert(e.Arguments.Count <= 1); if (e.Arguments.Count == 1 && e.Arguments[0].ExpressionKind == DbExpressionKind.Element) { DbElementExpression elementExpr = e.Arguments[0] as DbElementExpression; SqlSelectStatement result = VisitExpressionEnsureSqlStatement(elementExpr.Argument); if (!IsCompatible(result, DbExpressionKind.Element)) { Symbol fromSymbol; TypeUsage inputType = MetadataHelpers.GetElementTypeUsage(elementExpr.Argument.ResultType); result = CreateNewSelectStatement(result, "element", inputType, out fromSymbol); AddFromSymbol(result, "element", fromSymbol, false); } result.Top = new TopClause(1, false); return result; } // Otherwise simply build this out as a union-all ladder CollectionType collectionType = MetadataHelpers.GetEdmType<CollectionType>(e.ResultType); Debug.Assert(collectionType != null); bool isScalarElement = MetadataHelpers.IsPrimitiveType(collectionType.TypeUsage); SqlBuilder resultSql = new SqlBuilder(); string separator = ""; // handle empty table if (e.Arguments.Count == 0) { Debug.Assert(isScalarElement); resultSql.Append(" SELECT NULL"); resultSql.Append(" AS X FROM (SELECT 1) AS Y WHERE 1=0"); } foreach (DbExpression arg in e.Arguments) { resultSql.Append(separator); resultSql.Append(" SELECT "); resultSql.Append(arg.Accept(this)); // For scalar elements, no alias is appended yet. Add this. if (isScalarElement) { resultSql.Append(" AS X "); } separator = " UNION ALL "; } return resultSql; } /// <summary> /// <see cref="Visit(DbIsNullExpression)"/> /// </summary> /// <param name="e"></param> /// <param name="negate">Was the parent a DbNotExpression?</param> /// <returns></returns> SqlBuilder VisitIsNullExpression(DbIsNullExpression e, bool negate) { SqlBuilder result = new SqlBuilder(); result.Append(e.Argument.Accept(this)); if (!negate) { result.Append(" IS NULL"); } else { result.Append(" IS NOT NULL"); } return result; } /// <summary> /// This handles the processing of join expressions. /// The extents on a left spine are flattened, while joins /// not on the left spine give rise to new nested sub queries. /// /// Joins work differently from the rest of the visiting, in that /// the parent (i.e. the join node) creates the SqlSelectStatement /// for the children to use. /// /// The "parameter" IsInJoinContext indicates whether a child extent should /// add its stuff to the existing SqlSelectStatement, or create a new SqlSelectStatement /// By passing true, we ask the children to add themselves to the parent join, /// by passing false, we ask the children to create new Select statements for /// themselves. /// /// This method is called from <see cref="Visit(DbApplyExpression)"/> and /// <see cref="Visit(DbJoinExpression)"/>. /// </summary> /// <param name="inputs"></param> /// <param name="joinKind"></param> /// <param name="joinString"></param> /// <param name="joinCondition"></param> /// <returns> A <see cref="SqlSelectStatement"/></returns> ISqlFragment VisitJoinExpression(IList<DbExpressionBinding> inputs, DbExpressionKind joinKind, string joinString, DbExpression joinCondition) { SqlSelectStatement result; // If the parent is not a join( or says that it is not), // we should create a new SqlSelectStatement. // otherwise, we add our child extents to the parent's FROM clause. if (!IsParentAJoin) { result = new SqlSelectStatement(); result.AllJoinExtents = new List<Symbol>(); selectStatementStack.Push(result); } else { result = CurrentSelectStatement; } // Process each of the inputs, and then the joinCondition if it exists. // It would be nice if we could call VisitInputExpression - that would // avoid some code duplication // but the Join postprocessing is messy and prevents this reuse. symbolTable.EnterScope(); string separator = ""; bool isLeftMostInput = true; int inputCount = inputs.Count; for (int idx = 0; idx < inputCount; idx++) { DbExpressionBinding input = inputs[idx]; if (separator != "") { result.From.AppendLine(); } result.From.Append(separator + " "); // Change this if other conditions are required // to force the child to produce a nested SqlStatement. bool needsJoinContext = (input.Expression.ExpressionKind == DbExpressionKind.Scan) || (isLeftMostInput && (IsJoinExpression(input.Expression) || IsApplyExpression(input.Expression))) ; isParentAJoinStack.Push(needsJoinContext ? true : false); // if the child reuses our select statement, it will append the from // symbols to our FromExtents list. So, we need to remember the // start of the child's entries. int fromSymbolStart = result.FromExtents.Count; ISqlFragment fromExtentFragment = input.Expression.Accept(this); isParentAJoinStack.Pop(); ProcessJoinInputResult(fromExtentFragment, result, input, fromSymbolStart); separator = joinString; isLeftMostInput = false; } // Visit the on clause/join condition. switch (joinKind) { case DbExpressionKind.FullOuterJoin: case DbExpressionKind.InnerJoin: case DbExpressionKind.LeftOuterJoin: result.From.Append(" ON "); isParentAJoinStack.Push(false); result.From.Append(joinCondition.Accept(this)); isParentAJoinStack.Pop(); break; } symbolTable.ExitScope(); if (!IsParentAJoin) { selectStatementStack.Pop(); } return result; } /// <summary> /// This is called from <see cref="VisitJoinExpression"/>. /// /// This is responsible for maintaining the symbol table after visiting /// a child of a join expression. /// /// The child's sql statement may need to be completed. /// /// The child's result could be one of /// <list type="number"> /// <item>The same as the parent's - this is treated specially.</item> /// <item>A sql select statement, which may need to be completed</item> /// <item>An extent - just copy it to the from clause</item> /// <item>Anything else (from a collection-valued expression) - /// unnest and copy it.</item> /// </list> /// /// If the input was a Join, we need to create a new join symbol, /// otherwise, we create a normal symbol. /// /// We then call AddFromSymbol to add the AS clause, and update the symbol table. /// /// /// /// If the child's result was the same as the parent's, we have to clean up /// the list of symbols in the FromExtents list, since this contains symbols from /// the children of both the parent and the child. /// The happens when the child visited is a Join, and is the leftmost child of /// the parent. /// </summary> /// <param name="fromExtentFragment"></param> /// <param name="result"></param> /// <param name="input"></param> /// <param name="fromSymbolStart"></param> void ProcessJoinInputResult(ISqlFragment fromExtentFragment, SqlSelectStatement result, DbExpressionBinding input, int fromSymbolStart) { Symbol fromSymbol = null; if (result != fromExtentFragment) { // The child has its own select statement, and is not reusing // our select statement. // This should look a lot like VisitInputExpression(). SqlSelectStatement sqlSelectStatement = fromExtentFragment as SqlSelectStatement; if (sqlSelectStatement != null) { if (sqlSelectStatement.Select.IsEmpty) { List<Symbol> columns = AddDefaultColumns(sqlSelectStatement); if (IsJoinExpression(input.Expression) || IsApplyExpression(input.Expression)) { List<Symbol> extents = sqlSelectStatement.FromExtents; JoinSymbol newJoinSymbol = new JoinSymbol(input.VariableName, input.VariableType, extents); newJoinSymbol.IsNestedJoin = true; newJoinSymbol.ColumnList = columns; fromSymbol = newJoinSymbol; } else { // this is a copy of the code in CreateNewSelectStatement. // if the oldStatement has a join as its input, ... // clone the join symbol, so that we "reuse" the // join symbol. Normally, we create a new symbol - see the next block // of code. JoinSymbol oldJoinSymbol = sqlSelectStatement.FromExtents[0] as JoinSymbol; if (oldJoinSymbol != null) { // Note: sqlSelectStatement.FromExtents will not do, since it might // just be an alias of joinSymbol, and we want an actual JoinSymbol. JoinSymbol newJoinSymbol = new JoinSymbol(input.VariableName, input.VariableType, oldJoinSymbol.ExtentList); // This indicates that the sqlSelectStatement is a blocking scope // i.e. it hides/renames extent columns newJoinSymbol.IsNestedJoin = true; newJoinSymbol.ColumnList = columns; newJoinSymbol.FlattenedExtentList = oldJoinSymbol.FlattenedExtentList; fromSymbol = newJoinSymbol; } } } result.From.Append(" ("); result.From.Append(sqlSelectStatement); result.From.Append(" )"); } else if (input.Expression is DbScanExpression) { result.From.Append(fromExtentFragment); } else // bracket it { WrapNonQueryExtent(result, fromExtentFragment, input.Expression.ExpressionKind); } if (fromSymbol == null) // i.e. not a join symbol { fromSymbol = new Symbol(input.VariableName, input.VariableType); } AddFromSymbol(result, input.VariableName, fromSymbol); result.AllJoinExtents.Add(fromSymbol); } else // result == fromExtentFragment. The child extents have been merged into the parent's. { // we are adding extents to the current sql statement via flattening. // We are replacing the child's extents with a single Join symbol. // The child's extents are all those following the index fromSymbolStart. // List<Symbol> extents = new List<Symbol>(); // We cannot call extents.AddRange, since the is no simple way to // get the range of symbols fromSymbolStart..result.FromExtents.Count // from result.FromExtents. // We copy these symbols to create the JoinSymbol later. for (int i = fromSymbolStart; i < result.FromExtents.Count; ++i) { extents.Add(result.FromExtents[i]); } result.FromExtents.RemoveRange(fromSymbolStart, result.FromExtents.Count - fromSymbolStart); fromSymbol = new JoinSymbol(input.VariableName, input.VariableType, extents); result.FromExtents.Add(fromSymbol); // this Join Symbol does not have its own select statement, so we // do not set IsNestedJoin // We do not call AddFromSymbol(), since we do not want to add // "AS alias" to the FROM clause- it has been done when the extent was added earlier. symbolTable.Add(input.VariableName, fromSymbol); } } /// <summary> /// We assume that this is only called as a child of a Project. /// /// This replaces <see cref="Visit(DbNewInstanceExpression)"/>, since /// we do not allow DbNewInstanceExpression as a child of any node other than /// DbProjectExpression. /// /// We write out the translation of each of the columns in the record. /// </summary> /// <param name="e"></param> /// <returns>A <see cref="SqlBuilder"/></returns> ISqlFragment VisitNewInstanceExpression(DbNewInstanceExpression e) { SqlBuilder result = new SqlBuilder(); RowType rowType = e.ResultType.EdmType as RowType; if (null != rowType) { //_typeDefs.Length = 0; ReadOnlyMetadataCollection<EdmProperty> members = rowType.Properties; string separator = ""; for (int i = 0; i < e.Arguments.Count; ++i) { DbExpression argument = e.Arguments[i]; if (MetadataHelpers.IsRowType(argument.ResultType)) { // We do not support nested records or other complex objects. throw new NotSupportedException(); } EdmProperty member = members[i]; //_typeDefs.Append(separator); //_typeDefs.Append(GetSqlPrimitiveType(member.TypeUsage)); result.Append(separator); result.AppendLine(); result.Append(argument.Accept(this)); result.Append(" AS "); result.Append(QuoteIdentifier(member.Name)); separator = ", "; } } else { // // Types other then RowType (such as UDTs for instance) are not supported. // throw new NotSupportedException(); } return result; } ISqlFragment VisitSetOpExpression(DbExpression left, DbExpression right, string separator) { SqlSelectStatement leftSelectStatement = VisitExpressionEnsureSqlStatement(left); SqlSelectStatement rightSelectStatement = VisitExpressionEnsureSqlStatement(right); SqlBuilder setStatement = new SqlBuilder(); setStatement.Append(leftSelectStatement); setStatement.AppendLine(); setStatement.Append(separator); // e.g. UNION ALL setStatement.AppendLine(); setStatement.Append(rightSelectStatement); return setStatement; } #endregion #region Function Handling Helpers /// <summary> /// Determines whether the given function is a built-in function that requires special handling /// </summary> /// <param name="e"></param> /// <returns></returns> private bool IsSpecialBuiltInFunction(DbFunctionExpression e) { return IsBuiltinFunction(e.Function) && _builtInFunctionHandlers.ContainsKey(e.Function.Name); } /// <summary> /// Determines whether the given function is a canonical function that requires special handling /// </summary> /// <param name="e"></param> /// <returns></returns> private bool IsSpecialCanonicalFunction(DbFunctionExpression e) { return MetadataHelpers.IsCanonicalFunction(e.Function) && _canonicalFunctionHandlers.ContainsKey(e.Function.Name); } /// <summary> /// Default handling for functions /// Translates them to FunctionName(arg1, arg2, ..., argn) /// </summary> /// <param name="e"></param> /// <returns></returns> private ISqlFragment HandleFunctionDefault(DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); WriteFunctionName(result, e.Function); HandleFunctionArgumentsDefault(e, result); return result; } /// <summary> /// Default handling for functions with a given name. /// Translates them to functionName(arg1, arg2, ..., argn) /// </summary> /// <param name="e"></param> /// <param name="functionName"></param> /// <returns></returns> private ISqlFragment HandleFunctionDefaultGivenName(DbFunctionExpression e, string functionName) { SqlBuilder result = new SqlBuilder(); result.Append(functionName); HandleFunctionArgumentsDefault(e, result); return result; } /// <summary> /// Default handling on function arguments /// Appends the list of arguments to the given result /// If the function is niladic it does not append anything, /// otherwise it appends (arg1, arg2, ..., argn) /// </summary> /// <param name="e"></param> /// <param name="result"></param> private void HandleFunctionArgumentsDefault(DbFunctionExpression e, SqlBuilder result) { bool isNiladicFunction = MetadataHelpers.TryGetValueForMetadataProperty<bool>(e.Function, "NiladicFunctionAttribute"); if (isNiladicFunction && e.Arguments.Count > 0) { throw new InvalidOperationException("Niladic functions cannot have parameters"); } if (!isNiladicFunction) { result.Append("("); string separator = ""; foreach (DbExpression arg in e.Arguments) { result.Append(separator); result.Append(arg.Accept(this)); separator = ", "; } result.Append(")"); } } /// <summary> /// Handler for special built in functions /// </summary> /// <param name="e"></param> /// <returns></returns> private ISqlFragment HandleSpecialBuiltInFunction(DbFunctionExpression e) { return HandleSpecialFunction(_builtInFunctionHandlers, e); } /// <summary> /// Handler for special canonical functions /// </summary> /// <param name="e"></param> /// <returns></returns> private ISqlFragment HandleSpecialCanonicalFunction(DbFunctionExpression e) { return HandleSpecialFunction(_canonicalFunctionHandlers, e); } /// <summary> /// Dispatches the special function processing to the appropriate handler /// </summary> /// <param name="handlers"></param> /// <param name="e"></param> /// <returns></returns> private ISqlFragment HandleSpecialFunction(Dictionary<string, FunctionHandler> handlers, DbFunctionExpression e) { if (!handlers.ContainsKey(e.Function.Name)) throw new InvalidOperationException("Special handling should be called only for functions in the list of special functions"); return handlers[e.Function.Name](this, e); } /// <summary> /// Handles functions that are translated into TSQL operators. /// The given function should have one or two arguments. /// Functions with one arguemnt are translated into /// op arg /// Functions with two arguments are translated into /// arg0 op arg1 /// Also, the arguments can be optionaly enclosed in parethesis /// </summary> /// <param name="e"></param> /// <param name="parenthesiseArguments">Whether the arguments should be enclosed in parethesis</param> /// <returns></returns> private ISqlFragment HandleSpecialFunctionToOperator(DbFunctionExpression e, bool parenthesiseArguments) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.Arguments.Count > 0 && e.Arguments.Count <= 2, "There should be 1 or 2 arguments for operator"); if (e.Arguments.Count > 1) { if (parenthesiseArguments) { result.Append("("); } result.Append(e.Arguments[0].Accept(this)); if (parenthesiseArguments) { result.Append(")"); } } result.Append(" "); Debug.Assert(_functionNameToOperatorDictionary.ContainsKey(e.Function.Name), "The function can not be mapped to an operator"); result.Append(_functionNameToOperatorDictionary[e.Function.Name]); result.Append(" "); if (parenthesiseArguments) { result.Append("("); } result.Append(e.Arguments[e.Arguments.Count - 1].Accept(this)); if (parenthesiseArguments) { result.Append(")"); } return result; } /// <summary> /// <see cref="HandleSpecialFunctionToOperator"></see> /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleConcatFunction(SqlGenerator sqlgen, DbFunctionExpression e) { return sqlgen.HandleSpecialFunctionToOperator(e, false); } /// <summary> /// <see cref="HandleSpecialFunctionToOperator"></see> /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionBitwise(SqlGenerator sqlgen, DbFunctionExpression e) { return sqlgen.HandleSpecialFunctionToOperator(e, true); } private static ISqlFragment HandleGetDateFunction(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.Arguments.Count == 0, "Canonical getdate function should have no arguments"); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append("(STRFTIME('%s', 'now') * 10000000 + 621355968000000000)"); break; case SQLiteDateFormats.JulianDay: result.Append("CAST(STRFTIME('%J', 'now') AS double)"); break; default: result.Append("STRFTIME('%Y-%m-%d %H:%M:%S', 'now')"); break; } return result; } private static ISqlFragment HandleGetUtcDateFunction(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.Arguments.Count == 0, "Canonical getutcdate function should have no arguments"); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append("(STRFTIME('%s', 'now', 'utc') * 10000000 + 621355968000000000)"); break; case SQLiteDateFormats.JulianDay: result.Append("CAST(STRFTIME('%J', 'now', 'utc') AS double)"); break; default: result.Append("STRFTIME('%Y-%m-%d %H:%M:%S', 'now', 'utc')"); break; } return result; } /// <summary> /// Handles special case in which datepart 'type' parameter is present. all the functions /// handles here have *only* the 1st parameter as datepart. datepart value is passed along /// the QP as string and has to be expanded as TSQL keyword. /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleDatepartDateFunction(SqlGenerator sqlgen, DbFunctionExpression e) { Debug.Assert(e.Arguments.Count == 2, "datepart function must have 2 arguments"); DbConstantExpression constExpr = e.Arguments[0] as DbConstantExpression; if (null == constExpr) { throw new InvalidOperationException(String.Format("DATEPART argument to function '{0}.{1}' must be a literal string", e.Function.NamespaceName, e.Function.Name)); } string datepart = constExpr.Value as string; if (null == datepart) { throw new InvalidOperationException(String.Format("DATEPART argument to function '{0}.{1}' must be a literal string", e.Function.NamespaceName, e.Function.Name)); } SqlBuilder result = new SqlBuilder(); // // check if datepart value is valid // string trans; if (!_datepartKeywords.TryGetValue(datepart, out trans)) { throw new InvalidOperationException(String.Format("{0}' is not a valid value for DATEPART argument in '{1}.{2}' function", datepart, e.Function.NamespaceName, e.Function.Name)); } if (trans != "%f") { result.Append("CAST(STRFTIME('"); // expand the datepart literal as tsql kword result.Append(trans); result.Append("', "); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append(String.Format("(({0} - 621355968000000000) / 10000000.0)", e.Arguments[1].Accept(sqlgen))); break; default: result.Append(e.Arguments[1].Accept(sqlgen)); break; } result.Append(") AS integer)"); } else { result.Append("CAST(SUBSTR(STRFTIME('%f', "); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append(String.Format("(({0} - 621355968000000000) / 10000000.0)", e.Arguments[1].Accept(sqlgen))); break; default: result.Append(e.Arguments[1].Accept(sqlgen)); break; } result.Append("), 4) AS integer)"); } return result; } /// <summary> /// DateAdd(datetime, secondsToAdd) -> DATEADD ( seconds , number, date) /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionDateAdd(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.Arguments.Count == 2, "Canonical datepart functions should have exactly two arguments"); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append(String.Format("(STRFTIME('%s', JULIANDAY({1}) + ({0} / 86400.0)) * 10000000 + 621355968000000000)", e.Arguments[0].Accept(sqlgen), e.Arguments[1].Accept(sqlgen))); break; case SQLiteDateFormats.JulianDay: result.Append(String.Format("CAST(STRFTIME('%J', JULIANDAY({1}) + ({0} / 86400.0)) AS double)", e.Arguments[0].Accept(sqlgen), e.Arguments[1].Accept(sqlgen))); break; default: result.Append(String.Format("STRFTIME('%Y-%m-%d %H:%M:%S', JULIANDAY({1}) + ({0} / 86400.0))", e.Arguments[0].Accept(sqlgen), e.Arguments[1].Accept(sqlgen))); break; } return result; } /// <summary> /// DateSubtract(datetime1, datetime2) -> DATEDIFF ( seconds , startdate , enddate ) /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionDateSubtract(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); Debug.Assert(e.Arguments.Count == 2, "Canonical datepart functions should have exactly two arguments"); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append(String.Format("CAST((({0} - 621355968000000000) / 10000000.0) - (({1} - 621355968000000000) / 10000000.0) * 86400.0 AS integer)", e.Arguments[0].Accept(sqlgen), e.Arguments[1].Accept(sqlgen))); break; default: result.Append(String.Format("CAST((JULIANDAY({1}) - JULIANDAY({0})) * 86400.0 AS integer)", e.Arguments[0].Accept(sqlgen), e.Arguments[1].Accept(sqlgen))); break; } return result; } /// <summary> /// Handler for canonical functions for extracting date parts. /// For example: /// Year(date) -> DATEPART( year, date) /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionDatepart(SqlGenerator sqlgen, DbFunctionExpression e) { string trans; if (!_datepartKeywords.TryGetValue(e.Function.Name, out trans)) { throw new InvalidOperationException(String.Format("{0}' is not a valid value for STRFTIME argument", e.Function.Name)); } SqlBuilder result = new SqlBuilder(); result.Append("CAST(STRFTIME('"); result.Append(trans); result.Append("', "); Debug.Assert(e.Arguments.Count == 1, "Canonical datepart functions should have exactly one argument"); switch (sqlgen._manifest._dateFormat) { case SQLiteDateFormats.Ticks: result.Append(String.Format("(({0} - 621355968000000000) / 10000000.0)", e.Arguments[0].Accept(sqlgen))); break; default: result.Append(e.Arguments[0].Accept(sqlgen)); break; } result.Append(") AS integer)"); return result; } /// <summary> /// Function rename IndexOf -> CHARINDEX /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionIndexOf(SqlGenerator sqlgen, DbFunctionExpression e) { return sqlgen.HandleFunctionDefaultGivenName(e, "CHARINDEX"); } /// <summary> /// Function rename NewGuid -> NEWID /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionNewGuid(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); result.Append("RANDOMBLOB(16)"); return result; } /// <summary> /// Length(arg) -> LEN(arg + '.') - LEN('.') /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionLength(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); result.Append("LENGTH("); Debug.Assert(e.Arguments.Count == 1, "Len should have one argument"); result.Append(e.Arguments[0].Accept(sqlgen)); result.Append(")"); //result.Append(" + '.') - LEN('.')"); return result; } /// <summary> /// Round(numericExpression) -> Round(numericExpression, 0); /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionRound(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); result.Append("ROUND("); Debug.Assert(e.Arguments.Count == 1, "Round should have one argument"); result.Append(e.Arguments[0].Accept(sqlgen)); result.Append(", 0)"); return result; } /// <summary> /// TRIM(string) -> LTRIM(RTRIM(string)) /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionTrim(SqlGenerator sqlgen, DbFunctionExpression e) { SqlBuilder result = new SqlBuilder(); result.Append("TRIM("); Debug.Assert(e.Arguments.Count == 1, "Trim should have one argument"); result.Append(e.Arguments[0].Accept(sqlgen)); result.Append(")"); return result; } /// <summary> /// Function rename ToLower -> LOWER /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionToLower(SqlGenerator sqlgen, DbFunctionExpression e) { return sqlgen.HandleFunctionDefaultGivenName(e, "LOWER"); } /// <summary> /// Function rename ToUpper -> UPPER /// </summary> /// <param name="sqlgen"></param> /// <param name="e"></param> /// <returns></returns> private static ISqlFragment HandleCanonicalFunctionToUpper(SqlGenerator sqlgen, DbFunctionExpression e) { return sqlgen.HandleFunctionDefaultGivenName(e, "UPPER"); } #endregion #endregion #region Helper methods for the DbExpressionVisitor /// <summary> /// <see cref="AddDefaultColumns"/> /// Add the column names from the referenced extent/join to the /// select statement. /// /// If the symbol is a JoinSymbol, we recursively visit all the extents, /// halting at real extents and JoinSymbols that have an associated SqlSelectStatement. /// /// The column names for a real extent can be derived from its type. /// The column names for a Join Select statement can be got from the /// list of columns that was created when the Join's select statement /// was created. /// /// We do the following for each column. /// <list type="number"> /// <item>Add the SQL string for each column to the SELECT clause</item> /// <item>Add the column to the list of columns - so that it can /// become part of the "type" of a JoinSymbol</item> /// <item>Check if the column name collides with a previous column added /// to the same select statement. Flag both the columns for renaming if true.</item> /// <item>Add the column to a name lookup dictionary for collision detection.</item> /// </list> /// </summary> /// <param name="selectStatement">The select statement that started off as SELECT *</param> /// <param name="symbol">The symbol containing the type information for /// the columns to be added.</param> /// <param name="columnList">Columns that have been added to the Select statement. /// This is created in <see cref="AddDefaultColumns"/>.</param> /// <param name="columnDictionary">A dictionary of the columns above.</param> /// <param name="separator">Comma or nothing, depending on whether the SELECT /// clause is empty.</param> void AddColumns(SqlSelectStatement selectStatement, Symbol symbol, List<Symbol> columnList, Dictionary<string, Symbol> columnDictionary, ref string separator) { JoinSymbol joinSymbol = symbol as JoinSymbol; if (joinSymbol != null) { if (!joinSymbol.IsNestedJoin) { // Recurse if the join symbol is a collection of flattened extents foreach (Symbol sym in joinSymbol.ExtentList) { // if sym is ScalarType means we are at base case in the // recursion and there are not columns to add, just skip if (MetadataHelpers.IsPrimitiveType(sym.Type)) { continue; } AddColumns(selectStatement, sym, columnList, columnDictionary, ref separator); } } else { foreach (Symbol joinColumn in joinSymbol.ColumnList) { // we write tableName.columnName // rather than tableName.columnName as alias // since the column name is unique (by the way we generate new column names) // // We use the symbols for both the table and the column, // since they are subject to renaming. selectStatement.Select.Append(separator); selectStatement.Select.Append(symbol); selectStatement.Select.Append("."); selectStatement.Select.Append(joinColumn); // check for name collisions. If there is, // flag both the colliding symbols. if (columnDictionary.ContainsKey(joinColumn.Name)) { columnDictionary[joinColumn.Name].NeedsRenaming = true; // the original symbol joinColumn.NeedsRenaming = true; // the current symbol. } else { columnDictionary[joinColumn.Name] = joinColumn; } columnList.Add(joinColumn); separator = ", "; } } } else { // This is a non-join extent/select statement, and the CQT type has // the relevant column information. // The type could be a record type(e.g. Project(...), // or an entity type ( e.g. EntityExpression(...) // so, we check whether it is a structuralType. // Consider an expression of the form J(a, b=P(E)) // The inner P(E) would have been translated to a SQL statement // We should not use the raw names from the type, but the equivalent // symbols (they are present in symbol.Columns) if they exist. // // We add the new columns to the symbol's columns if they do // not already exist. // foreach (EdmProperty property in MetadataHelpers.GetProperties(symbol.Type)) { string recordMemberName = property.Name; // Since all renaming happens in the second phase // we lose nothing by setting the next column name index to 0 // many times. allColumnNames[recordMemberName] = 0; // Create a new symbol/reuse existing symbol for the column Symbol columnSymbol; if (!symbol.Columns.TryGetValue(recordMemberName, out columnSymbol)) { // we do not care about the types of columns, so we pass null // when construction the symbol. columnSymbol = new Symbol(recordMemberName, null); symbol.Columns.Add(recordMemberName, columnSymbol); } selectStatement.Select.Append(separator); selectStatement.Select.Append(symbol); selectStatement.Select.Append("."); // We use the actual name before the "AS", the new name goes // after the AS. selectStatement.Select.Append(QuoteIdentifier(recordMemberName)); selectStatement.Select.Append(" AS "); selectStatement.Select.Append(columnSymbol); // Check for column name collisions. if (columnDictionary.ContainsKey(recordMemberName)) { columnDictionary[recordMemberName].NeedsRenaming = true; columnSymbol.NeedsRenaming = true; } else { columnDictionary[recordMemberName] = symbol.Columns[recordMemberName]; } columnList.Add(columnSymbol); separator = ", "; } } } /// <summary> /// Expands Select * to "select the_list_of_columns" /// If the columns are taken from an extent, they are written as /// {original_column_name AS Symbol(original_column)} to allow renaming. /// /// If the columns are taken from a Join, they are written as just /// {original_column_name}, since there cannot be a name collision. /// /// We concatenate the columns from each of the inputs to the select statement. /// Since the inputs may be joins that are flattened, we need to recurse. /// The inputs are inferred from the symbols in FromExtents. /// </summary> /// <param name="selectStatement"></param> /// <returns></returns> List<Symbol> AddDefaultColumns(SqlSelectStatement selectStatement) { // This is the list of columns added in this select statement // This forms the "type" of the Select statement, if it has to // be expanded in another SELECT * List<Symbol> columnList = new List<Symbol>(); // A lookup for the previous set of columns to aid column name // collision detection. Dictionary<string, Symbol> columnDictionary = new Dictionary<string, Symbol>(StringComparer.OrdinalIgnoreCase); string separator = ""; // The Select should usually be empty before we are called, // but we do not mind if it is not. if (!selectStatement.Select.IsEmpty) { separator = ", "; } foreach (Symbol symbol in selectStatement.FromExtents) { AddColumns(selectStatement, symbol, columnList, columnDictionary, ref separator); } return columnList; } /// <summary> /// <see cref="AddFromSymbol(SqlSelectStatement, string, Symbol, bool)"/> /// </summary> /// <param name="selectStatement"></param> /// <param name="inputVarName"></param> /// <param name="fromSymbol"></param> void AddFromSymbol(SqlSelectStatement selectStatement, string inputVarName, Symbol fromSymbol) { AddFromSymbol(selectStatement, inputVarName, fromSymbol, true); } /// <summary> /// This method is called after the input to a relational node is visited. /// <see cref="Visit(DbProjectExpression)"/> and <see cref="ProcessJoinInputResult"/> /// There are 2 scenarios /// <list type="number"> /// <item>The fromSymbol is new i.e. the select statement has just been /// created, or a join extent has been added.</item> /// <item>The fromSymbol is old i.e. we are reusing a select statement.</item> /// </list> /// /// If we are not reusing the select statement, we have to complete the /// FROM clause with the alias /// <code> /// -- if the input was an extent /// FROM = [SchemaName].[TableName] /// -- if the input was a Project /// FROM = (SELECT ... FROM ... WHERE ...) /// </code> /// /// These become /// <code> /// -- if the input was an extent /// FROM = [SchemaName].[TableName] AS alias /// -- if the input was a Project /// FROM = (SELECT ... FROM ... WHERE ...) AS alias /// </code> /// and look like valid FROM clauses. /// /// Finally, we have to add the alias to the global list of aliases used, /// and also to the current symbol table. /// </summary> /// <param name="selectStatement"></param> /// <param name="inputVarName">The alias to be used.</param> /// <param name="fromSymbol"></param> /// <param name="addToSymbolTable"></param> void AddFromSymbol(SqlSelectStatement selectStatement, string inputVarName, Symbol fromSymbol, bool addToSymbolTable) { // the first check is true if this is a new statement // the second check is true if we are in a join - we do not // check if we are in a join context. // We do not want to add "AS alias" if it has been done already // e.g. when we are reusing the Sql statement. if (selectStatement.FromExtents.Count == 0 || fromSymbol != selectStatement.FromExtents[0]) { selectStatement.FromExtents.Add(fromSymbol); selectStatement.From.Append(" AS "); selectStatement.From.Append(fromSymbol); // We have this inside the if statement, since // we only want to add extents that are actually used. allExtentNames[fromSymbol.Name] = 0; } if (addToSymbolTable) { symbolTable.Add(inputVarName, fromSymbol); } } /// <summary> /// Translates a list of SortClauses. /// Used in the translation of OrderBy /// </summary> /// <param name="orderByClause">The SqlBuilder to which the sort keys should be appended</param> /// <param name="sortKeys"></param> void AddSortKeys(SqlBuilder orderByClause, IList<DbSortClause> sortKeys) { string separator = ""; foreach (DbSortClause sortClause in sortKeys) { orderByClause.Append(separator); orderByClause.Append(sortClause.Expression.Accept(this)); Debug.Assert(sortClause.Collation != null); if (!String.IsNullOrEmpty(sortClause.Collation)) { orderByClause.Append(" COLLATE "); orderByClause.Append(sortClause.Collation); } orderByClause.Append(sortClause.Ascending ? " ASC" : " DESC"); separator = ", "; } } /// <summary> /// <see cref="CreateNewSelectStatement(SqlSelectStatement oldStatement, string inputVarName, TypeUsage inputVarType, bool finalizeOldStatement, out Symbol fromSymbol) "/> /// </summary> /// <param name="oldStatement"></param> /// <param name="inputVarName"></param> /// <param name="inputVarType"></param> /// <param name="fromSymbol"></param> /// <returns>A new select statement, with the old one as the from clause.</returns> SqlSelectStatement CreateNewSelectStatement(SqlSelectStatement oldStatement, string inputVarName, TypeUsage inputVarType, out Symbol fromSymbol) { return CreateNewSelectStatement(oldStatement, inputVarName, inputVarType, true, out fromSymbol); } /// <summary> /// This is called after a relational node's input has been visited, and the /// input's sql statement cannot be reused. <see cref="Visit(DbProjectExpression)"/> /// /// When the input's sql statement cannot be reused, we create a new sql /// statement, with the old one as the from clause of the new statement. /// /// The old statement must be completed i.e. if it has an empty select list, /// the list of columns must be projected out. /// /// If the old statement being completed has a join symbol as its from extent, /// the new statement must have a clone of the join symbol as its extent. /// We cannot reuse the old symbol, but the new select statement must behave /// as though it is working over the "join" record. /// </summary> /// <param name="oldStatement"></param> /// <param name="inputVarName"></param> /// <param name="inputVarType"></param> /// <param name="finalizeOldStatement"></param> /// <param name="fromSymbol"></param> /// <returns>A new select statement, with the old one as the from clause.</returns> SqlSelectStatement CreateNewSelectStatement(SqlSelectStatement oldStatement, string inputVarName, TypeUsage inputVarType, bool finalizeOldStatement, out Symbol fromSymbol) { fromSymbol = null; // Finalize the old statement if (finalizeOldStatement && oldStatement.Select.IsEmpty) { List<Symbol> columns = AddDefaultColumns(oldStatement); // Thid could not have been called from a join node. Debug.Assert(oldStatement.FromExtents.Count == 1); // if the oldStatement has a join as its input, ... // clone the join symbol, so that we "reuse" the // join symbol. Normally, we create a new symbol - see the next block // of code. JoinSymbol oldJoinSymbol = oldStatement.FromExtents[0] as JoinSymbol; if (oldJoinSymbol != null) { // Note: oldStatement.FromExtents will not do, since it might // just be an alias of joinSymbol, and we want an actual JoinSymbol. JoinSymbol newJoinSymbol = new JoinSymbol(inputVarName, inputVarType, oldJoinSymbol.ExtentList); // This indicates that the oldStatement is a blocking scope // i.e. it hides/renames extent columns newJoinSymbol.IsNestedJoin = true; newJoinSymbol.ColumnList = columns; newJoinSymbol.FlattenedExtentList = oldJoinSymbol.FlattenedExtentList; fromSymbol = newJoinSymbol; } } if (fromSymbol == null) { // This is just a simple extent/SqlSelectStatement, // and we can get the column list from the type. fromSymbol = new Symbol(inputVarName, inputVarType); } // Observe that the following looks like the body of Visit(ExtentExpression). SqlSelectStatement selectStatement = new SqlSelectStatement(); selectStatement.From.Append("( "); selectStatement.From.Append(oldStatement); selectStatement.From.AppendLine(); selectStatement.From.Append(") "); return selectStatement; } /// <summary> /// Before we embed a string literal in a SQL string, we should /// convert all ' to '', and enclose the whole string in single quotes. /// </summary> /// <param name="s"></param> /// <param name="isUnicode"></param> /// <returns>The escaped sql string.</returns> private static string EscapeSingleQuote(string s, bool isUnicode) { return "'" + s.Replace("'", "''") + "'"; } /// <summary> /// Returns the sql primitive/native type name. /// It will include size, precision or scale depending on type information present in the /// type facets /// </summary> /// <param name="type"></param> /// <returns></returns> private string GetSqlPrimitiveType(TypeUsage type) { PrimitiveType primitiveType = MetadataHelpers.GetEdmType<PrimitiveType>(type); string typeName = primitiveType.Name; bool isUnicode = true; bool isFixedLength = false; int maxLength = 0; string length = "max"; bool preserveSeconds = true; byte decimalPrecision = 0; byte decimalScale = 0; switch (primitiveType.PrimitiveTypeKind) { case PrimitiveTypeKind.Binary: maxLength = MetadataHelpers.GetFacetValueOrDefault<int>(type, MetadataHelpers.MaxLengthFacetName, MetadataHelpers.BinaryMaxMaxLength); if (maxLength == MetadataHelpers.BinaryMaxMaxLength) { length = "max"; } else { length = maxLength.ToString(CultureInfo.InvariantCulture); } isFixedLength = MetadataHelpers.GetFacetValueOrDefault<bool>(type, MetadataHelpers.FixedLengthFacetName, false); typeName = (isFixedLength ? "binary(" : "varbinary(") + length + ")"; break; case PrimitiveTypeKind.String: // Question: How do we handle ntext? isUnicode = MetadataHelpers.GetFacetValueOrDefault<bool>(type, MetadataHelpers.UnicodeFacetName, true); isFixedLength = MetadataHelpers.GetFacetValueOrDefault<bool>(type, MetadataHelpers.FixedLengthFacetName, false); maxLength = MetadataHelpers.GetFacetValueOrDefault<int>(type, MetadataHelpers.MaxLengthFacetName, Int32.MinValue); if (maxLength == Int32.MinValue) { length = "max"; } else { length = maxLength.ToString(CultureInfo.InvariantCulture); } if (isUnicode && !isFixedLength && maxLength > 4000) length = "max"; if (!isUnicode && !isFixedLength && maxLength > 8000) length = "max"; if (isFixedLength) { typeName = (isUnicode ? "nchar(" : "char(") + length + ")"; } else { typeName = (isUnicode ? "nvarchar(" : "varchar(") + length + ")"; } break; case PrimitiveTypeKind.DateTime: preserveSeconds = MetadataHelpers.GetFacetValueOrDefault<bool>(type, MetadataHelpers.PreserveSecondsFacetName, false); typeName = preserveSeconds ? "datetime" : "smalldatetime"; break; case PrimitiveTypeKind.Decimal: decimalPrecision = MetadataHelpers.GetFacetValueOrDefault<byte>(type, MetadataHelpers.PrecisionFacetName, 18); Debug.Assert(decimalPrecision > 0, "decimal precision must be greater than zero"); decimalScale = MetadataHelpers.GetFacetValueOrDefault<byte>(type, MetadataHelpers.ScaleFacetName, 0); Debug.Assert(decimalPrecision >= decimalScale, "decimalPrecision must be greater or equal to decimalScale"); Debug.Assert(decimalPrecision <= 53, "decimalPrecision must be less than or equal to 53"); typeName = typeName + "(" + decimalPrecision + "," + decimalScale + ")"; break; case PrimitiveTypeKind.Int32: typeName = "int"; break; case PrimitiveTypeKind.Int64: typeName = "bigint"; break; case PrimitiveTypeKind.Int16: typeName = "smallint"; break; case PrimitiveTypeKind.Byte: typeName = "tinyint"; break; case PrimitiveTypeKind.Boolean: typeName = "bit"; break; case PrimitiveTypeKind.Single: typeName = "real"; break; case PrimitiveTypeKind.Double: typeName = "float"; break; case PrimitiveTypeKind.Guid: typeName = "uniqueidentifier"; break; default: throw new NotSupportedException("Unsupported EdmType: " + primitiveType.PrimitiveTypeKind); } return typeName; } /// <summary> /// Handles the expression represending DbLimitExpression.Limit and DbSkipExpression.Count. /// If it is a constant expression, it simply does to string thus avoiding casting it to the specific value /// (which would be done if <see cref="Visit(DbConstantExpression)"/> is called) /// </summary> /// <param name="e"></param> /// <returns></returns> private ISqlFragment HandleCountExpression(DbExpression e) { ISqlFragment result; if (e.ExpressionKind == DbExpressionKind.Constant) { //For constant expression we should not cast the value, // thus we don't go throught the default DbConstantExpression handling SqlBuilder sqlBuilder = new SqlBuilder(); sqlBuilder.Append(((DbConstantExpression)e).Value.ToString()); result = sqlBuilder; } else { result = e.Accept(this); } return result; } /// <summary> /// This is used to determine if a particular expression is an Apply operation. /// This is only the case when the DbExpressionKind is CrossApply or OuterApply. /// </summary> /// <param name="e"></param> /// <returns></returns> bool IsApplyExpression(DbExpression e) { return (DbExpressionKind.CrossApply == e.ExpressionKind || DbExpressionKind.OuterApply == e.ExpressionKind); } private bool IsKeyForIn(DbExpression e) { if ((e.ExpressionKind != DbExpressionKind.Property) && (e.ExpressionKind != DbExpressionKind.VariableReference)) { return (e.ExpressionKind == DbExpressionKind.ParameterReference); } return true; } /// <summary> /// This is used to determine if a particular expression is a Join operation. /// This is true for DbCrossJoinExpression and DbJoinExpression, the /// latter of which may have one of several different ExpressionKinds. /// </summary> /// <param name="e"></param> /// <returns></returns> bool IsJoinExpression(DbExpression e) { return (DbExpressionKind.CrossJoin == e.ExpressionKind || DbExpressionKind.FullOuterJoin == e.ExpressionKind || DbExpressionKind.InnerJoin == e.ExpressionKind || DbExpressionKind.LeftOuterJoin == e.ExpressionKind); } /// <summary> /// This is used to determine if a calling expression needs to place /// round brackets around the translation of the expression e. /// /// Constants, parameters and properties do not require brackets, /// everything else does. /// </summary> /// <param name="e"></param> /// <returns>true, if the expression needs brackets </returns> bool IsComplexExpression(DbExpression e) { switch (e.ExpressionKind) { case DbExpressionKind.Constant: case DbExpressionKind.ParameterReference: case DbExpressionKind.Property: return false; default: return true; } } /// <summary> /// Determine if the owner expression can add its unique sql to the input's /// SqlSelectStatement /// </summary> /// <param name="result">The SqlSelectStatement of the input to the relational node.</param> /// <param name="expressionKind">The kind of the expression node(not the input's)</param> /// <returns></returns> bool IsCompatible(SqlSelectStatement result, DbExpressionKind expressionKind) { switch (expressionKind) { case DbExpressionKind.Distinct: return result.Top == null // The projection after distinct may not project all // columns used in the Order By && result.OrderBy.IsEmpty; case DbExpressionKind.Filter: return result.Select.IsEmpty && result.Where.IsEmpty && result.GroupBy.IsEmpty && result.Top == null; case DbExpressionKind.GroupBy: return result.Select.IsEmpty && result.GroupBy.IsEmpty && result.OrderBy.IsEmpty && result.Top == null; case DbExpressionKind.Limit: case DbExpressionKind.Element: return result.Top == null; case DbExpressionKind.Project: return result.Select.IsEmpty && result.GroupBy.IsEmpty; case DbExpressionKind.Skip: return result.Select.IsEmpty && result.GroupBy.IsEmpty && result.OrderBy.IsEmpty && !result.IsDistinct; case DbExpressionKind.Sort: return result.Select.IsEmpty && result.GroupBy.IsEmpty && result.OrderBy.IsEmpty; default: Debug.Assert(false); throw new InvalidOperationException(); } } private void ParenthesizeExpressionWithoutRedundantConstantCasts(DbExpression value, SqlBuilder sqlBuilder) { if (value.ExpressionKind == DbExpressionKind.Constant) { sqlBuilder.Append(this.Visit((DbConstantExpression)value)); } else { this.ParanthesizeExpressionIfNeeded(value, sqlBuilder); } } private void ParanthesizeExpressionIfNeeded(DbExpression e, SqlBuilder result) { if (IsComplexExpression(e)) { result.Append("("); result.Append(e.Accept<ISqlFragment>(this)); result.Append(")"); } else { result.Append(e.Accept<ISqlFragment>(this)); } } /// <summary> /// We use the normal box quotes for SQL server. We do not deal with ANSI quotes /// i.e. double quotes. /// </summary> /// <param name="name"></param> /// <returns></returns> internal static string QuoteIdentifier(string name) { Debug.Assert(!String.IsNullOrEmpty(name)); // We assume that the names are not quoted to begin with. return "[" + name.Replace("]", "]]") + "]"; } private bool TryAddExpressionForIn(DbBinaryExpression e, KeyToListMap<DbExpression, DbExpression> values) { if (this.IsKeyForIn(e.Left)) { values.Add(e.Left, e.Right); return true; } if (this.IsKeyForIn(e.Right)) { values.Add(e.Right, e.Left); return true; } return false; } /// <summary> /// Simply calls <see cref="VisitExpressionEnsureSqlStatement(DbExpression, bool)"/> /// with addDefaultColumns set to true /// </summary> /// <param name="e"></param> /// <returns></returns> SqlSelectStatement VisitExpressionEnsureSqlStatement(DbExpression e) { return VisitExpressionEnsureSqlStatement(e, true); } /// <summary> /// This is called from <see cref="GenerateSql(DbQueryCommandTree)"/> and nodes which require a /// select statement as an argument e.g. <see cref="Visit(DbIsEmptyExpression)"/>, /// <see cref="Visit(DbUnionAllExpression)"/>. /// /// SqlGenerator needs its child to have a proper alias if the child is /// just an extent or a join. /// /// The normal relational nodes result in complete valid SQL statements. /// For the rest, we need to treat them as there was a dummy /// <code> /// -- originally {expression} /// -- change that to /// SELECT * /// FROM {expression} as c /// </code> /// /// DbLimitExpression needs to start the statement but not add the default columns /// </summary> /// <param name="e"></param> /// <param name="addDefaultColumns"></param> /// <returns></returns> SqlSelectStatement VisitExpressionEnsureSqlStatement(DbExpression e, bool addDefaultColumns) { Debug.Assert(MetadataHelpers.IsCollectionType(e.ResultType)); SqlSelectStatement result; switch (e.ExpressionKind) { case DbExpressionKind.Project: case DbExpressionKind.Filter: case DbExpressionKind.GroupBy: case DbExpressionKind.Sort: result = e.Accept(this) as SqlSelectStatement; break; default: Symbol fromSymbol; string inputVarName = "c"; // any name will do - this is my random choice. symbolTable.EnterScope(); TypeUsage type = null; switch (e.ExpressionKind) { case DbExpressionKind.Scan: case DbExpressionKind.CrossJoin: case DbExpressionKind.FullOuterJoin: case DbExpressionKind.InnerJoin: case DbExpressionKind.LeftOuterJoin: case DbExpressionKind.CrossApply: case DbExpressionKind.OuterApply: type = MetadataHelpers.GetElementTypeUsage(e.ResultType); break; default: Debug.Assert(MetadataHelpers.IsCollectionType(e.ResultType)); type = MetadataHelpers.GetEdmType<CollectionType>(e.ResultType).TypeUsage; break; } result = VisitInputExpression(e, inputVarName, type, out fromSymbol); AddFromSymbol(result, inputVarName, fromSymbol); symbolTable.ExitScope(); break; } if (addDefaultColumns && result.Select.IsEmpty) { AddDefaultColumns(result); } return result; } /// <summary> /// This method is called by <see cref="Visit(DbFilterExpression)"/> and /// <see cref="Visit(DbQuantifierExpression)"/> /// /// </summary> /// <param name="input"></param> /// <param name="predicate"></param> /// <param name="negatePredicate">This is passed from <see cref="Visit(DbQuantifierExpression)"/> /// in the All(...) case.</param> /// <returns></returns> SqlSelectStatement VisitFilterExpression(DbExpressionBinding input, DbExpression predicate, bool negatePredicate) { Symbol fromSymbol; SqlSelectStatement result = VisitInputExpression(input.Expression, input.VariableName, input.VariableType, out fromSymbol); // Filter is compatible with OrderBy // but not with Project, another Filter or GroupBy if (!IsCompatible(result, DbExpressionKind.Filter)) { result = CreateNewSelectStatement(result, input.VariableName, input.VariableType, out fromSymbol); } selectStatementStack.Push(result); symbolTable.EnterScope(); AddFromSymbol(result, input.VariableName, fromSymbol); if (negatePredicate) { result.Where.Append("NOT ("); } result.Where.Append(predicate.Accept(this)); if (negatePredicate) { result.Where.Append(")"); } symbolTable.ExitScope(); selectStatementStack.Pop(); return result; } /// <summary> /// If the sql fragment for an input expression is not a SqlSelect statement /// or other acceptable form (e.g. an extent as a SqlBuilder), we need /// to wrap it in a form acceptable in a FROM clause. These are /// primarily the /// <list type="bullet"> /// <item>The set operation expressions - union all, intersect, except</item> /// <item>TVFs, which are conceptually similar to tables</item> /// </list> /// </summary> /// <param name="result"></param> /// <param name="sqlFragment"></param> /// <param name="expressionKind"></param> void WrapNonQueryExtent(SqlSelectStatement result, ISqlFragment sqlFragment, DbExpressionKind expressionKind) { switch (expressionKind) { case DbExpressionKind.Function: // TVF result.From.Append(sqlFragment); break; default: result.From.Append(" ("); result.From.Append(sqlFragment); result.From.Append(")"); break; } } /// <summary> /// Is this a builtin function (ie) does it have the builtinAttribute specified? /// </summary> /// <param name="function"></param> /// <returns></returns> private static bool IsBuiltinFunction(EdmFunction function) { return MetadataHelpers.TryGetValueForMetadataProperty<bool>(function, "BuiltInAttribute"); } /// <summary> /// /// </summary> /// <param name="function"></param> /// <param name="result"></param> void WriteFunctionName(SqlBuilder result, EdmFunction function) { string storeFunctionName = MetadataHelpers.TryGetValueForMetadataProperty<string>(function, "StoreFunctionNameAttribute"); if (string.IsNullOrEmpty(storeFunctionName)) { storeFunctionName = function.Name; } // If the function is a builtin (ie) the BuiltIn attribute has been // specified, then, the function name should not be quoted; additionally, // no namespace should be used. if (IsBuiltinFunction(function)) { if (function.NamespaceName == "Edm") { switch (storeFunctionName.ToUpperInvariant()) { default: result.Append(storeFunctionName); break; } } else { result.Append(storeFunctionName); } } else { // Should we actually support this? //result.Append(QuoteIdentifier((string)function.MetadataProperties["Schema"].Value ?? "dbo")); //result.Append("."); result.Append(QuoteIdentifier(storeFunctionName)); } } static string ByteArrayToBinaryString(Byte[] binaryArray) { StringBuilder sb = new StringBuilder(binaryArray.Length * 2); for (int i = 0; i < binaryArray.Length; i++) { sb.Append(hexDigits[(binaryArray[i] & 0xF0) >> 4]).Append(hexDigits[binaryArray[i] & 0x0F]); } return sb.ToString(); } /// <summary> /// Helper method for the Group By visitor /// Returns true if at least one of the aggregates in the given list /// has an argument that is not a <see cref="DbPropertyExpression"/> /// over <see cref="DbVariableReferenceExpression"/> /// </summary> /// <param name="aggregates"></param> /// <returns></returns> static bool NeedsInnerQuery(IList<DbAggregate> aggregates) { foreach (DbAggregate aggregate in aggregates) { Debug.Assert(aggregate.Arguments.Count == 1); if (!IsPropertyOverVarRef(aggregate.Arguments[0])) { return true; } } return false; } /// <summary> /// Determines whether the given expression is a <see cref="DbPropertyExpression"/> /// over <see cref="DbVariableReferenceExpression"/> /// </summary> /// <param name="expression"></param> /// <returns></returns> static bool IsPropertyOverVarRef(DbExpression expression) { DbPropertyExpression propertyExpression = expression as DbPropertyExpression; if (propertyExpression == null) { return false; } DbVariableReferenceExpression varRefExpression = propertyExpression.Instance as DbVariableReferenceExpression; if (varRefExpression == null) { return false; } return true; } #endregion private class KeyFieldExpressionComparer : IEqualityComparer<DbExpression> { // Fields internal static readonly SqlGenerator.KeyFieldExpressionComparer Singleton = new SqlGenerator.KeyFieldExpressionComparer(); // Methods private KeyFieldExpressionComparer() { } public bool Equals(DbExpression x, DbExpression y) { if (x.ExpressionKind == y.ExpressionKind) { DbExpressionKind expressionKind = x.ExpressionKind; if (expressionKind <= DbExpressionKind.ParameterReference) { switch (expressionKind) { case DbExpressionKind.Cast: { DbCastExpression expression5 = (DbCastExpression)x; DbCastExpression expression6 = (DbCastExpression)y; return ((expression5.ResultType == expression6.ResultType) && this.Equals(expression5.Argument, expression6.Argument)); } case DbExpressionKind.ParameterReference: { DbParameterReferenceExpression expression3 = (DbParameterReferenceExpression)x; DbParameterReferenceExpression expression4 = (DbParameterReferenceExpression)y; return (expression3.ParameterName == expression4.ParameterName); } } goto Label_00CC; } if (expressionKind != DbExpressionKind.Property) { if (expressionKind == DbExpressionKind.VariableReference) { return (x == y); } goto Label_00CC; } DbPropertyExpression expression = (DbPropertyExpression)x; DbPropertyExpression expression2 = (DbPropertyExpression)y; if (expression.Property == expression2.Property) { return this.Equals(expression.Instance, expression2.Instance); } } return false; Label_00CC: return false; } public int GetHashCode(DbExpression obj) { switch (obj.ExpressionKind) { case DbExpressionKind.Cast: return this.GetHashCode(((DbCastExpression)obj).Argument); case DbExpressionKind.ParameterReference: return (((DbParameterReferenceExpression)obj).ParameterName.GetHashCode() ^ 0x7fffffff); case DbExpressionKind.Property: return ((DbPropertyExpression)obj).Property.GetHashCode(); case DbExpressionKind.VariableReference: return ((DbVariableReferenceExpression)obj).VariableName.GetHashCode(); } return obj.GetHashCode(); } } } } |
Added System.Data.SQLite.Linq/SQL Generation/SqlSelectStatement.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 | //--------------------------------------------------------------------- // <copyright file="SqlSelectStatement.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// A SqlSelectStatement represents a canonical SQL SELECT statement. /// It has fields for the 5 main clauses /// <list type="number"> /// <item>SELECT</item> /// <item>FROM</item> /// <item>WHERE</item> /// <item>GROUP BY</item> /// <item>ORDER BY</item> /// </list> /// We do not have HAVING, since it does not correspond to anything in the DbCommandTree. /// Each of the fields is a SqlBuilder, so we can keep appending SQL strings /// or other fragments to build up the clause. /// /// We have a IsDistinct property to indicate that we want distict columns. /// This is given out of band, since the input expression to the select clause /// may already have some columns projected out, and we use append-only SqlBuilders. /// The DISTINCT is inserted when we finally write the object into a string. /// /// Also, we have a Top property, which is non-null if the number of results should /// be limited to certain number. It is given out of band for the same reasons as DISTINCT. /// /// The FromExtents contains the list of inputs in use for the select statement. /// There is usually just one element in this - Select statements for joins may /// temporarily have more than one. /// /// If the select statement is created by a Join node, we maintain a list of /// all the extents that have been flattened in the join in AllJoinExtents /// <example> /// in J(j1= J(a,b), c) /// FromExtents has 2 nodes JoinSymbol(name=j1, ...) and Symbol(name=c) /// AllJoinExtents has 3 nodes Symbol(name=a), Symbol(name=b), Symbol(name=c) /// </example> /// /// If any expression in the non-FROM clause refers to an extent in a higher scope, /// we add that extent to the OuterExtents list. This list denotes the list /// of extent aliases that may collide with the aliases used in this select statement. /// It is set by <see cref="SqlGenerator.Visit(DbVariableReferenceExpression)"/>. /// An extent is an outer extent if it is not one of the FromExtents. /// /// /// </summary> internal sealed class SqlSelectStatement : ISqlFragment { private bool isDistinct; /// <summary> /// Do we need to add a DISTINCT at the beginning of the SELECT /// </summary> internal bool IsDistinct { get { return isDistinct; } set { isDistinct = value; } } private List<Symbol> allJoinExtents; internal List<Symbol> AllJoinExtents { get { return allJoinExtents; } // We have a setter as well, even though this is a list, // since we use this field only in special cases. set { allJoinExtents = value; } } private List<Symbol> fromExtents; internal List<Symbol> FromExtents { get { if (null == fromExtents) { fromExtents = new List<Symbol>(); } return fromExtents; } } private Dictionary<Symbol, bool> outerExtents; internal Dictionary<Symbol, bool> OuterExtents { get { if (null == outerExtents) { outerExtents = new Dictionary<Symbol, bool>(); } return outerExtents; } } private TopClause top; internal TopClause Top { get { return top; } set { Debug.Assert(top == null, "SqlSelectStatement.Top has already been set"); top = value; } } private SqlBuilder select = new SqlBuilder(); internal SqlBuilder Select { get { return select; } } private SqlBuilder from = new SqlBuilder(); internal SqlBuilder From { get { return from; } } private SqlBuilder where; internal SqlBuilder Where { get { if (null == where) { where = new SqlBuilder(); } return where; } } private SqlBuilder groupBy; internal SqlBuilder GroupBy { get { if (null == groupBy) { groupBy = new SqlBuilder(); } return groupBy; } } private SqlBuilder orderBy; public SqlBuilder OrderBy { get { if (null == orderBy) { orderBy = new SqlBuilder(); } return orderBy; } } //indicates whether it is the top most select statement, // if not Order By should be omitted unless there is a corresponding TOP private bool isTopMost; internal bool IsTopMost { get { return this.isTopMost; } set { this.isTopMost = value; } } #region ISqlFragment Members /// <summary> /// Write out a SQL select statement as a string. /// We have to /// <list type="number"> /// <item>Check whether the aliases extents we use in this statement have /// to be renamed. /// We first create a list of all the aliases used by the outer extents. /// For each of the FromExtents( or AllJoinExtents if it is non-null), /// rename it if it collides with the previous list. /// </item> /// <item>Write each of the clauses (if it exists) as a string</item> /// </list> /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { #region Check if FROM aliases need to be renamed // Create a list of the aliases used by the outer extents // JoinSymbols have to be treated specially. List<string> outerExtentAliases = null; if ((null != outerExtents) && (0 < outerExtents.Count)) { foreach (Symbol outerExtent in outerExtents.Keys) { JoinSymbol joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (Symbol symbol in joinSymbol.FlattenedExtentList) { if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); } outerExtentAliases.Add(symbol.NewName); } } else { if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); } outerExtentAliases.Add(outerExtent.NewName); } } } // An then rename each of the FromExtents we have // If AllJoinExtents is non-null - it has precedence. // The new name is derived from the old name - we append an increasing int. List<Symbol> extentList = this.AllJoinExtents ?? this.fromExtents; if (null != extentList) { foreach (Symbol fromAlias in extentList) { if ((null != outerExtentAliases) && outerExtentAliases.Contains(fromAlias.Name)) { int i = sqlGenerator.AllExtentNames[fromAlias.Name]; string newName; do { ++i; newName = fromAlias.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture); } while (sqlGenerator.AllExtentNames.ContainsKey(newName)); sqlGenerator.AllExtentNames[fromAlias.Name] = i; fromAlias.NewName = newName; // Add extent to list of known names (although i is always incrementing, "prefix11" can // eventually collide with "prefix1" when it is extended) sqlGenerator.AllExtentNames[newName] = 0; } // Add the current alias to the list, so that the extents // that follow do not collide with me. if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); } outerExtentAliases.Add(fromAlias.NewName); } } #endregion // Increase the indent, so that the Sql statement is nested by one tab. writer.Indent += 1; // ++ can be confusing in this context writer.Write("SELECT "); if (IsDistinct) { writer.Write("DISTINCT "); } if ((null == this.select) || this.Select.IsEmpty) { Debug.Assert(false); // we have removed all possibilities of SELECT *. writer.Write("*"); } else { this.Select.WriteSql(writer, sqlGenerator); } writer.WriteLine(); writer.Write("FROM "); this.From.WriteSql(writer, sqlGenerator); if ((null != this.where) && !this.Where.IsEmpty) { writer.WriteLine(); writer.Write("WHERE "); this.Where.WriteSql(writer, sqlGenerator); } if ((null != this.groupBy) && !this.GroupBy.IsEmpty) { writer.WriteLine(); writer.Write("GROUP BY "); this.GroupBy.WriteSql(writer, sqlGenerator); } if ((null != this.orderBy) && !this.OrderBy.IsEmpty && (this.IsTopMost || this.Top != null)) { writer.WriteLine(); writer.Write("ORDER BY "); this.OrderBy.WriteSql(writer, sqlGenerator); } if (this.Top != null) { this.Top.WriteSql(writer, sqlGenerator); } --writer.Indent; } #endregion } } |
Added System.Data.SQLite.Linq/SQL Generation/SqlWriter.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | //--------------------------------------------------------------------- // <copyright file="SqlWriter.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// This extends StringWriter primarily to add the ability to add an indent /// to each line that is written out. /// </summary> class SqlWriter : StringWriter { // We start at -1, since the first select statement will increment it to 0. int indent = -1; /// <summary> /// The number of tabs to be added at the beginning of each new line. /// </summary> internal int Indent { get { return indent; } set { indent = value; } } bool atBeginningOfLine = true; /// <summary> /// /// </summary> /// <param name="b"></param> public SqlWriter(StringBuilder b) : base(b, System.Globalization.CultureInfo.InvariantCulture) { } /// <summary> /// Reset atBeginningofLine if we detect the newline string. /// <see cref="SqlBuilder.AppendLine"/> /// Add as many tabs as the value of indent if we are at the /// beginning of a line. /// </summary> /// <param name="value"></param> public override void Write(string value) { if (value == "\r\n") { base.WriteLine(); atBeginningOfLine = true; } else { if (atBeginningOfLine) { if (indent > 0) { base.Write(new string('\t', indent)); } atBeginningOfLine = false; } base.Write(value); } } /// <summary> /// /// </summary> public override void WriteLine() { base.WriteLine(); atBeginningOfLine = true; } } } |
Added System.Data.SQLite.Linq/SQL Generation/StringUtil.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | /******************************************************** * ADO.NET 2.0 Data Provider for SQLite Version 3.X * Written by Robert Simpson (robert@blackcastlesoft.com) * * Released to the public domain, use at your own risk! ********************************************************/ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Globalization; using System.Runtime; using System.Collections; namespace System.Data.SQLite { internal static class StringUtil { // Fields private const string s_defaultDelimiter = ", "; // Methods internal static string BuildDelimitedList<T>(IEnumerable<T> values, ToStringConverter<T> converter, string delimiter) { if (values == null) { return string.Empty; } if (converter == null) { converter = new ToStringConverter<T>(StringUtil.InvariantConvertToString<T>); } if (delimiter == null) { delimiter = ", "; } StringBuilder builder = new StringBuilder(); bool flag = true; foreach (T local in values) { if (flag) { flag = false; } else { builder.Append(delimiter); } builder.Append(converter(local)); } return builder.ToString(); } internal static string FormatIndex(string arrayVarName, int index) { StringBuilder builder = new StringBuilder((arrayVarName.Length + 10) + 2); return builder.Append(arrayVarName).Append('[').Append(index).Append(']').ToString(); } internal static string FormatInvariant(string format, params object[] args) { return string.Format(CultureInfo.InvariantCulture, format, args); } internal static StringBuilder FormatStringBuilder(StringBuilder builder, string format, params object[] args) { builder.AppendFormat(CultureInfo.InvariantCulture, format, args); return builder; } internal static StringBuilder IndentNewLine(StringBuilder builder, int indent) { builder.AppendLine(); for (int i = 0; i < indent; i++) { builder.Append(" "); } return builder; } private static string InvariantConvertToString<T>(T value) { return string.Format(CultureInfo.InvariantCulture, "{0}", new object[] { value }); } [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] internal static bool IsNullOrEmptyOrWhiteSpace(string value) { return IsNullOrEmptyOrWhiteSpace(value, 0); } internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset) { if (value != null) { for (int i = offset; i < value.Length; i++) { if (!char.IsWhiteSpace(value[i])) { return false; } } } return true; } internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset, int length) { if (value != null) { length = Math.Min(value.Length, length); for (int i = offset; i < length; i++) { if (!char.IsWhiteSpace(value[i])) { return false; } } } return true; } internal static string MembersToCommaSeparatedString(IEnumerable members) { StringBuilder builder = new StringBuilder(); builder.Append("{"); ToCommaSeparatedString(builder, members); builder.Append("}"); return builder.ToString(); } internal static string ToCommaSeparatedString(IEnumerable list) { return ToSeparatedString(list, ", ", string.Empty); } internal static void ToCommaSeparatedString(StringBuilder builder, IEnumerable list) { ToSeparatedStringPrivate(builder, list, ", ", string.Empty, false); } internal static string ToCommaSeparatedStringSorted(IEnumerable list) { return ToSeparatedStringSorted(list, ", ", string.Empty); } internal static void ToCommaSeparatedStringSorted(StringBuilder builder, IEnumerable list) { ToSeparatedStringPrivate(builder, list, ", ", string.Empty, true); } internal static string ToSeparatedString(IEnumerable list, string separator, string nullValue) { StringBuilder stringBuilder = new StringBuilder(); ToSeparatedString(stringBuilder, list, separator, nullValue); return stringBuilder.ToString(); } internal static void ToSeparatedString(StringBuilder builder, IEnumerable list, string separator) { ToSeparatedStringPrivate(builder, list, separator, string.Empty, false); } [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] internal static void ToSeparatedString(StringBuilder stringBuilder, IEnumerable list, string separator, string nullValue) { ToSeparatedStringPrivate(stringBuilder, list, separator, nullValue, false); } private static void ToSeparatedStringPrivate(StringBuilder stringBuilder, IEnumerable list, string separator, string nullValue, bool toSort) { if (list != null) { bool flag = true; List<string> list2 = new List<string>(); foreach (object obj2 in list) { string str; if (obj2 == null) { str = nullValue; } else { str = FormatInvariant("{0}", new object[] { obj2 }); } list2.Add(str); } if (toSort) { list2.Sort(StringComparer.Ordinal); } foreach (string str2 in list2) { if (!flag) { stringBuilder.Append(separator); } stringBuilder.Append(str2); flag = false; } } } internal static string ToSeparatedStringSorted(IEnumerable list, string separator, string nullValue) { StringBuilder stringBuilder = new StringBuilder(); ToSeparatedStringPrivate(stringBuilder, list, separator, nullValue, true); return stringBuilder.ToString(); } internal static void ToSeparatedStringSorted(StringBuilder builder, IEnumerable list, string separator) { ToSeparatedStringPrivate(builder, list, separator, string.Empty, true); } // Nested Types internal delegate string ToStringConverter<T>(T value); } } |
Added System.Data.SQLite.Linq/SQL Generation/Symbol.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | //--------------------------------------------------------------------- // <copyright file="Symbol.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// <see cref="SymbolTable"/> /// This class represents an extent/nested select statement, /// or a column. /// /// The important fields are Name, Type and NewName. /// NewName starts off the same as Name, and is then modified as necessary. /// /// /// The rest are used by special symbols. /// e.g. NeedsRenaming is used by columns to indicate that a new name must /// be picked for the column in the second phase of translation. /// /// IsUnnest is used by symbols for a collection expression used as a from clause. /// This allows <see cref="SqlGenerator.AddFromSymbol(SqlSelectStatement, string, Symbol, bool)"/> to add the column list /// after the alias. /// /// </summary> class Symbol : ISqlFragment { private Dictionary<string, Symbol> columns = new Dictionary<string, Symbol>(StringComparer.CurrentCultureIgnoreCase); internal Dictionary<string, Symbol> Columns { get { return columns; } } private bool needsRenaming = false; internal bool NeedsRenaming { get { return needsRenaming; } set { needsRenaming = value; } } bool isUnnest = false; internal bool IsUnnest { get { return isUnnest; } set { isUnnest = value; } } string name; public string Name { get { return name; } } string newName; public string NewName { get { return newName; } set { newName = value; } } private TypeUsage type; internal TypeUsage Type { get { return type; } set { type = value; } } public Symbol(string name, TypeUsage type) { this.name = name; this.newName = name; this.Type = type; } #region ISqlFragment Members /// <summary> /// Write this symbol out as a string for sql. This is just /// the new name of the symbol (which could be the same as the old name). /// /// We rename columns here if necessary. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { if (this.NeedsRenaming) { string newName; int i = sqlGenerator.AllColumnNames[this.NewName]; do { ++i; newName = this.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture); } while (sqlGenerator.AllColumnNames.ContainsKey(newName)); sqlGenerator.AllColumnNames[this.NewName] = i; // Prevent it from being renamed repeatedly. this.NeedsRenaming = false; this.NewName = newName; // Add this column name to list of known names so that there are no subsequent // collisions sqlGenerator.AllColumnNames[newName] = 0; } writer.Write(SqlGenerator.QuoteIdentifier(this.NewName)); } #endregion } } |
Added System.Data.SQLite.Linq/SQL Generation/SymbolPair.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | //--------------------------------------------------------------------- // <copyright file="SymbolPair.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// The SymbolPair exists to solve the record flattening problem. /// <see cref="SqlGenerator.Visit(DbPropertyExpression)"/> /// Consider a property expression D(v, "j3.j2.j1.a.x") /// where v is a VarRef, j1, j2, j3 are joins, a is an extent and x is a columns. /// This has to be translated eventually into {j'}.{x'} /// /// The source field represents the outermost SqlStatement representing a join /// expression (say j2) - this is always a Join symbol. /// /// The column field keeps moving from one join symbol to the next, until it /// stops at a non-join symbol. /// /// This is returned by <see cref="SqlGenerator.Visit(DbPropertyExpression)"/>, /// but never makes it into a SqlBuilder. /// </summary> class SymbolPair : ISqlFragment { public Symbol Source; public Symbol Column; public SymbolPair(Symbol source, Symbol column) { this.Source = source; this.Column = column; } #region ISqlFragment Members public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { // Symbol pair should never be part of a SqlBuilder. Debug.Assert(false); } #endregion } } |
Added System.Data.SQLite.Linq/SQL Generation/SymbolTable.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | //--------------------------------------------------------------------- // <copyright file="SymbolTable.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// The symbol table is quite primitive - it is a stack with a new entry for /// each scope. Lookups search from the top of the stack to the bottom, until /// an entry is found. /// /// The symbols are of the following kinds /// <list type="bullet"> /// <item><see cref="Symbol"/> represents tables (extents/nested selects/unnests)</item> /// <item><see cref="JoinSymbol"/> represents Join nodes</item> /// <item><see cref="Symbol"/> columns.</item> /// </list> /// /// Symbols represent names <see cref="SqlGenerator.Visit(DbVariableReferenceExpression)"/> to be resolved, /// or things to be renamed. /// </summary> internal sealed class SymbolTable { private List<Dictionary<string, Symbol>> symbols = new List<Dictionary<string, Symbol>>(); internal void EnterScope() { symbols.Add(new Dictionary<string, Symbol>(StringComparer.OrdinalIgnoreCase)); } internal void ExitScope() { symbols.RemoveAt(symbols.Count - 1); } internal void Add(string name, Symbol value) { symbols[symbols.Count - 1][name] = value; } internal Symbol Lookup(string name) { for (int i = symbols.Count - 1; i >= 0; --i) { if (symbols[i].ContainsKey(name)) { return symbols[i][name]; } } return null; } } } |
Added System.Data.SQLite.Linq/SQL Generation/TopClause.cs.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 | //--------------------------------------------------------------------- // <copyright file="TopClause.cs" company="Microsoft"> // Portions of this file copyright (c) Microsoft Corporation // and are released under the Microsoft Pulic License. See // http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx // or License.txt for details. // All rights reserved. // </copyright> //--------------------------------------------------------------------- namespace System.Data.SQLite { using System; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.IO; using System.Text; using System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; /// <summary> /// TopClause represents the a TOP expression in a SqlSelectStatement. /// It has a count property, which indicates how many TOP rows should be selected and a /// boolen WithTies property. /// </summary> class TopClause : ISqlFragment { ISqlFragment topCount; bool withTies; /// <summary> /// Do we need to add a WITH_TIES to the top statement /// </summary> internal bool WithTies { get { return withTies; } } /// <summary> /// How many top rows should be selected. /// </summary> internal ISqlFragment TopCount { get { return topCount; } } /// <summary> /// Creates a TopClause with the given topCount and withTies. /// </summary> /// <param name="topCount"></param> /// <param name="withTies"></param> internal TopClause(ISqlFragment topCount, bool withTies) { this.topCount = topCount; this.withTies = withTies; } /// <summary> /// Creates a TopClause with the given topCount and withTies. /// </summary> /// <param name="topCount"></param> /// <param name="withTies"></param> internal TopClause(int topCount, bool withTies) { SqlBuilder sqlBuilder = new SqlBuilder(); sqlBuilder.Append(topCount.ToString(CultureInfo.InvariantCulture)); this.topCount = sqlBuilder; this.withTies = withTies; } #region ISqlFragment Members /// <summary> /// Write out the TOP part of sql select statement /// It basically writes TOP (X) [WITH TIES]. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write(" LIMIT "); this.TopCount.WriteSql(writer, sqlGenerator); if (this.WithTies) throw new NotSupportedException("WITH TIES"); //writer.Write(" "); //if (this.WithTies) //{ // writer.Write("WITH TIES "); //} } #endregion } } |