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Overview
Comment: | Use savepoints to implement nested transaction support. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | tkt-1f7bfff467 |
Files: | files | file ages | folders |
SHA1: |
712e256f4f0433abc15cbbda5495c30f |
User & Date: | mistachkin 2016-10-28 20:09:33.628 |
Context
2016-10-28
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21:08 | Update version history docs. check-in: 15904edeb7 user: mistachkin tags: tkt-1f7bfff467 | |
20:09 | Use savepoints to implement nested transaction support. check-in: 712e256f4f user: mistachkin tags: tkt-1f7bfff467 | |
2016-10-27
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20:42 | Draft changes to address ticket [1f7bfff467]. check-in: 0b11868e92 user: mistachkin tags: tkt-1f7bfff467 | |
Changes
Changes to System.Data.SQLite/SQLiteTransaction.cs.
1 2 3 4 5 6 7 8 9 | /******************************************************** * 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! ********************************************************/ namespace System.Data.SQLite { | | | | | > > | | | | | | | | | | | | | | | | | | | | | | | > > | | | | | | | | | > > > > > > > > > > > > > > > > > > > | > | | | | | | | > | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | > > | | | | | | | | | > > > > > > > > > > > > > > > | | | | | | | > > | | | | | | | > > | | | | | | | > > | | | | | | | | | | > > > > > > > > > | | | | | | | > > | | | | | > > > > > > > > > > > > > > > > > > | | | | | | | | < | < | | | > | < > | > > > > > > > > > > > > > > | | > > > > > > > > > > | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 | /******************************************************** * 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! ********************************************************/ namespace System.Data.SQLite { using System; using System.Data; using System.Data.Common; using System.Threading; /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// SQLite implementation of DbTransaction. /// </summary> public sealed class SQLiteTransaction : DbTransaction { /// <summary> /// The connection to which this transaction is bound /// </summary> internal SQLiteConnection _cnn; internal int _version; // Matches the version of the connection private IsolationLevel _level; /// <summary> /// Constructs the transaction object, binding it to the supplied connection /// </summary> /// <param name="connection">The connection to open a transaction on</param> /// <param name="deferredLock">TRUE to defer the writelock, or FALSE to lock immediately</param> internal SQLiteTransaction(SQLiteConnection connection, bool deferredLock) { _cnn = connection; _version = _cnn._version; _level = (deferredLock == true) ? SQLiteConnection.DeferredIsolationLevel : SQLiteConnection.ImmediateIsolationLevel; int level; if ((level = _cnn._transactionLevel++) == 0) { try { using (SQLiteCommand cmd = _cnn.CreateCommand()) { if (!deferredLock) cmd.CommandText = "BEGIN IMMEDIATE;"; else cmd.CommandText = "BEGIN;"; cmd.ExecuteNonQuery(); } } catch (SQLiteException) { _cnn._transactionLevel--; _cnn = null; throw; } } else { try { using (SQLiteCommand cmd = _cnn.CreateCommand()) { cmd.CommandText = String.Format( "SAVEPOINT {0};", GetSavePointName(level)); cmd.ExecuteNonQuery(); } } catch (SQLiteException) { _cnn._transactionLevel--; _cnn = null; throw; } } } /////////////////////////////////////////////////////////////////////////////////////////////// #region IDisposable "Pattern" Members private bool disposed; private void CheckDisposed() /* throw */ { #if THROW_ON_DISPOSED if (disposed) throw new ObjectDisposedException(typeof(SQLiteTransaction).Name); #endif } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Disposes the transaction. If it is currently active, any changes are rolled back. /// </summary> protected override void Dispose(bool disposing) { try { if (!disposed) { if (disposing) { //////////////////////////////////// // dispose managed resources here... //////////////////////////////////// if (IsValid(false)) { IssueRollback(false); } } ////////////////////////////////////// // release unmanaged resources here... ////////////////////////////////////// } } finally { base.Dispose(disposing); // // NOTE: Everything should be fully disposed at this point. // disposed = true; } } #endregion /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Commits the current transaction. /// </summary> public override void Commit() { CheckDisposed(); SQLiteConnection.Check(_cnn); IsValid(true); int level = _cnn._transactionLevel; if (level - 1 == 0) { using (SQLiteCommand cmd = _cnn.CreateCommand()) { cmd.CommandText = "COMMIT;"; cmd.ExecuteNonQuery(); } _cnn._transactionLevel--; _cnn = null; } else { using (SQLiteCommand cmd = _cnn.CreateCommand()) { cmd.CommandText = String.Format( "RELEASE {0};", GetSavePointName(level - 1)); cmd.ExecuteNonQuery(); } _cnn._transactionLevel--; } } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Returns the underlying connection to which this transaction applies. /// </summary> public new SQLiteConnection Connection { get { CheckDisposed(); return _cnn; } } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Forwards to the local Connection property /// </summary> protected override DbConnection DbConnection { get { return Connection; } } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Gets the isolation level of the transaction. SQLite only supports Serializable transactions. /// </summary> public override IsolationLevel IsolationLevel { get { CheckDisposed(); return _level; } } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Rolls back the active transaction. /// </summary> public override void Rollback() { CheckDisposed(); SQLiteConnection.Check(_cnn); IsValid(true); IssueRollback(true); } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Issue a ROLLBACK command against the database connection, /// optionally re-throwing any caught exception. /// </summary> /// <param name="throwError"> /// Non-zero to re-throw caught exceptions. /// </param> internal void IssueRollback(bool throwError) { SQLiteConnection cnn = Interlocked.Exchange(ref _cnn, null); if (cnn != null) { int level = cnn._transactionLevel; if (level - 1 == 0) { try { using (SQLiteCommand cmd = cnn.CreateCommand()) { cmd.CommandText = "ROLLBACK;"; cmd.ExecuteNonQuery(); } } catch { if (throwError) throw; } } else { try { using (SQLiteCommand cmd = cnn.CreateCommand()) { cmd.CommandText = String.Format( "ROLLBACK TO {0};", GetSavePointName(level - 1)); cmd.ExecuteNonQuery(); } } catch { if (throwError) throw; } } cnn._transactionLevel--; } } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Constructs the name of a new or existing savepoint. /// </summary> /// <param name="level"> /// The transaction level associated with the connection. /// </param> /// <returns> /// The name of the savepoint -OR- null if it cannot be constructed. /// </returns> private static string GetSavePointName( int level ) { return String.Format("sqlite_dotnet_savepoint_{0}", level); } /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Checks the state of this transaction, optionally throwing an exception if a state inconsistency is found. /// </summary> /// <param name="throwError"> /// Non-zero to throw an exception if a state inconsistency is found. /// </param> /// <returns> /// Non-zero if this transaction is valid; otherwise, false. /// </returns> internal bool IsValid(bool throwError) { if (_cnn == null) { if (throwError == true) throw new ArgumentNullException("No connection associated with this transaction"); else return false; } if (_cnn._version != _version) { if (throwError == true) throw new SQLiteException("The connection was closed and re-opened, changes were already rolled back"); else return false; } if (_cnn.State != ConnectionState.Open) { if (throwError == true) throw new SQLiteException("Connection was closed"); else return false; } if (_cnn._transactionLevel == 0 || _cnn._sql.AutoCommit == true) { _cnn._transactionLevel = 0; // Make sure the transaction level is reset before returning if (throwError == true) throw new SQLiteException("No transaction is active on this connection"); else return false; } return true; } } } |
Added Tests/tkt-1f7bfff467.eagle.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 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 | ############################################################################### # # tkt-1f7bfff467.eagle -- # # Written by Joe Mistachkin. # Released to the public domain, use at your own risk! # ############################################################################### package require Eagle package require Eagle.Library package require Eagle.Test runTestPrologue ############################################################################### package require System.Data.SQLite.Test runSQLiteTestPrologue ############################################################################### runTest {test tkt-1f7bfff467-1.1 {rollback nested transaction} -setup { setupDb [set fileName tkt-1f7bfff467-1.1.db] } -body { sql execute $db { CREATE TABLE t1(x); INSERT INTO t1(x) VALUES(1); INSERT INTO t1(x) VALUES(2); INSERT INTO t1(x) VALUES(3); } set result [list] set transaction(1) [sql transaction begin $db] lappend result [sql execute -transaction $transaction(1) \ -execute scalar $db "SELECT COUNT(*) FROM t1;"] sql execute -transaction $transaction(1) $db \ "INSERT INTO t1(x) VALUES(4);" lappend result [sql execute -transaction $transaction(1) \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] set transaction(2) [sql transaction begin $db] sql execute -transaction $transaction(2) $db \ "DELETE FROM t1 WHERE x = 2;" lappend result [sql execute -transaction $transaction(2) \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] sql transaction rollback $transaction(2) sql execute -transaction $transaction(1) $db \ "UPDATE t1 SET x = 9 WHERE x = 3;" sql transaction commit $transaction(1) lappend result [sql execute \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] set result } -cleanup { cleanupDb $fileName unset -nocomplain result transaction db fileName } -constraints {eagle command.object monoBug28 monoBug211 command.sql\ compile.DATA SQLite System.Data.SQLite} -result {3 {1 2 3 4} {1 3 4} {1 2 4 9}}} ############################################################################### runSQLiteTestEpilogue runTestEpilogue |