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Overview
Comment: | Experimental changes to support implementing a SQLiteFunction using a generic delegate. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | delegateFunction |
Files: | files | file ages | folders |
SHA1: |
d1cfa62cb03d0b7a88935f7c69fe3a79 |
User & Date: | mistachkin 2015-08-04 22:54:35.135 |
Context
2015-08-05
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00:55 | Coding style enhancements. check-in: 0ebe466b2a user: mistachkin tags: delegateFunction | |
2015-08-04
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22:54 | Experimental changes to support implementing a SQLiteFunction using a generic delegate. check-in: d1cfa62cb0 user: mistachkin tags: delegateFunction | |
2015-07-30
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18:30 | Update release procedures wiki page. check-in: fc9062d656 user: mistachkin tags: trunk | |
Changes
Changes to System.Data.SQLite/SQLiteConnection.cs.
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1379 1380 1381 1382 1383 1384 1385 | 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 | - + - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + | /////////////////////////////////////////////////////////////////////////////////////////////// /// <summary> /// Attempts to bind the specified <see cref="SQLiteFunction" /> object /// instance to this connection. /// </summary> /// <param name="functionAttribute"> |
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Changes to System.Data.SQLite/SQLiteFunction.cs.
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63 64 65 66 67 68 69 | 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | - + | /// </summary> private SQLiteCallback _StepFunc; /// <summary> /// Holds a reference to the callback function for finalizing an aggregate function /// </summary> private SQLiteFinalCallback _FinalFunc; /// <summary> |
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273 274 275 276 277 278 279 | 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | - + | public virtual object Final(object contextData) { CheckDisposed(); return null; } /// <summary> |
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426 427 428 429 430 431 432 | 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 | - + | { // do nothing. } } } /// <summary> |
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473 474 475 476 477 478 479 | 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 | - + | if ((_base != null) && _base.IsOpen()) _base.Cancel(); return 0; } /// <summary> |
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724 725 726 727 728 729 730 | 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 | - - - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - - - - + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - - + + + + + + + - + | /// <summary> /// Manual method of registering a function. The type must still have the SQLiteFunctionAttributes in order to work /// properly, but this is a workaround for the Compact Framework where enumerating assemblies is not currently supported. /// </summary> /// <param name="typ">The type of the function to register</param> public static void RegisterFunction(Type typ) { |
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767 768 769 770 771 772 773 | 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 | - - - - - + + + + + + + + + + + | in _registeredFunctions) { SQLiteFunctionAttribute pr = pair.Key; if (pr == null) continue; |
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857 858 859 860 861 862 863 | 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 | - + | } } return result; } /// <summary> |
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985 986 987 988 989 990 991 992 993 994 995 996 997 998 | 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 | + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + | name, null, null, false) == SQLiteErrorCode.Ok; } } } ///////////////////////////////////////////////////////////////////////////// /// <summary> /// This class implements a SQLite function using a <see cref="Delegate" />. /// All the virtual methods of the <see cref="SQLiteFunction" /> class are /// implemented using calls to the <see cref="Delegate.DynamicInvoke" /> /// method. The arguments are presented in the same order they appear in /// the associated <see cref="SQLiteFunction" /> methods with one exception: /// the first argument is the name of the virtual method being implemented. /// </summary> public class SQLiteDelegateFunction : SQLiteFunction { #region Private Constants /// <summary> /// This error message is used by the overridden virtual methods when the /// callback has not been set. /// </summary> private const string NoCallbackError = "No callback is set."; ///////////////////////////////////////////////////////////////////////// /// <summary> /// This error message is used by the overridden <see cref="Compare" /> /// method when the result does not have a type of <see cref="Int32" />. /// </summary> private const string ResultInt32Error = "\"{0}\" result must be Int32."; #endregion ///////////////////////////////////////////////////////////////////////// #region Public Constructors /// <summary> /// Constructs an empty instance of this class. /// </summary> public SQLiteDelegateFunction() : this(null) { // do nothing. } ///////////////////////////////////////////////////////////////////////// /// <summary> /// Constructs an instance of this class using the specified /// <see cref="Delegate" /> as the <see cref="SQLiteFunction" /> /// implementation. /// </summary> /// <param name="callback"> /// The <see cref="Delegate" /> to be used for all calls into the /// virtual methods needed by the <see cref="SQLiteFunction" /> /// class. /// </param> public SQLiteDelegateFunction( Delegate callback ) { this.callback = callback; } #endregion ///////////////////////////////////////////////////////////////////////// #region Protected Methods /// <summary> /// Returns the list of arguments for the <see cref="Invoke" /> method, /// as an <see cref="Array" /> of <see cref="Object" />. The first /// argument is always the literal string "Invoke". /// </summary> /// <param name="args"> /// The original arguments received by the <see cref="Invoke" /> method. /// </param> /// <returns> /// The arguments to pass to the configured <see cref="Delegate" />. /// </returns> protected virtual object[] GetInvokeArgs( object[] args ) /* CANNOT RETURN NULL */ { if (args == null) return new object[] { "Invoke" }; object[] newArgs = new object[args.Length + 1]; newArgs[0] = "Invoke"; for (int index = 0; index < args.Length; index++) newArgs[index + 1] = args[index]; return newArgs; } ///////////////////////////////////////////////////////////////////////// /// <summary> /// Returns the list of arguments for the <see cref="Step" /> method, /// as an <see cref="Array" /> of <see cref="Object" />. The first /// argument is always the literal string "Step". /// </summary> /// <param name="args"> /// The original arguments received by the <see cref="Step" /> method. /// </param> /// <param name="stepNumber"> /// The step number (one based). This is incrememted each time the /// <see cref="Step" /> method is called. /// </param> /// <param name="contextData"> /// A placeholder for implementers to store contextual data pertaining /// to the current context. /// </param> /// <returns> /// The arguments to pass to the configured <see cref="Delegate" />. /// </returns> protected virtual object[] GetStepArgs( object[] args, int stepNumber, object contextData ) /* CANNOT RETURN NULL */ { int newLength = 3; /* "Step", stepNumber, contextData */ if (args != null) newLength += args.Length; object[] newArgs = new object[newLength]; newArgs[0] = "Step"; if (args != null) for (int index = 0; index < args.Length; index++) newArgs[index + 1] = args[index]; newArgs[newLength - 2] = stepNumber; newArgs[newLength - 1] = contextData; return newArgs; } ///////////////////////////////////////////////////////////////////////// /// <summary> /// Returns the list of arguments for the <see cref="Final" /> method, /// as an <see cref="Array" /> of <see cref="Object" />. The first /// argument is always the literal string "Final". /// </summary> /// <param name="contextData"> /// A placeholder for implementers to store contextual data pertaining /// to the current context. /// </param> /// <returns> /// The arguments to pass to the configured <see cref="Delegate" />. /// </returns> protected virtual object[] GetFinalArgs( object contextData ) /* CANNOT RETURN NULL */ { return new object[] { "Final", contextData }; } ///////////////////////////////////////////////////////////////////////// /// <summary> /// Returns the list of arguments for the <see cref="Compare" /> method, /// as an <see cref="Array" /> of <see cref="Object" />. The first /// argument is always the literal string "Compare". /// </summary> /// <param name="param1"> /// The first string to compare. /// </param> /// <param name="param2"> /// The second strnig to compare. /// </param> /// <returns> /// The arguments to pass to the configured <see cref="Delegate" />. /// </returns> protected virtual object[] GetCompareArgs( string param1, string param2 ) /* CANNOT RETURN NULL */ { return new object[] { "Compare", param1, param2 }; } #endregion ///////////////////////////////////////////////////////////////////////// #region Public Properties private Delegate callback; /// <summary> /// The <see cref="Delegate" /> to be used for all calls into the /// virtual methods needed by the <see cref="SQLiteFunction" /> /// class. /// </summary> public virtual Delegate Callback { get { return callback; } set { callback = value; } } #endregion ///////////////////////////////////////////////////////////////////////// #region System.Data.SQLite.SQLiteFunction Overrides /// <summary> /// This virtual method is the implementation for scalar functions. /// See the <see cref="SQLiteFunction.Invoke" /> method for more /// details. /// </summary> /// <param name="args"> /// The arguments for the scalar function. The first argument is always /// the literal string "Invoke". The remaining arguments, if any, are /// passed exactly as they are received. /// </param> /// <returns> /// The result of the scalar function. /// </returns> public override object Invoke( object[] args /* in */ ) { if (callback == null) throw new InvalidOperationException(NoCallbackError); return callback.DynamicInvoke(GetInvokeArgs(args)); /* throw */ } ///////////////////////////////////////////////////////////////////////// /// <summary> /// This virtual method is part of the implementation for aggregate /// functions. See the <see cref="SQLiteFunction.Step" /> method /// for more details. /// </summary> /// <param name="args"> /// The arguments for the aggregate function. The first argument is /// always the literal string "Step". The remaining arguments, if /// any, are passed exactly as they are received. /// </param> /// <param name="stepNumber"> /// The step number (one based). This is incrememted each time the /// <see cref="Step" /> method is called. /// </param> /// <param name="contextData"> /// A placeholder for implementers to store contextual data pertaining /// to the current context. /// </param> public override void Step( object[] args, /* in */ int stepNumber, /* in */ ref object contextData /* in, out */ ) { if (callback == null) throw new InvalidOperationException(NoCallbackError); object[] newArgs = GetStepArgs(args, stepNumber, contextData); /* IGNORED */ callback.DynamicInvoke(newArgs); /* throw */ contextData = newArgs[newArgs.Length - 1]; /* out */ } ///////////////////////////////////////////////////////////////////////// /// <summary> /// This virtual method is part of the implementation for aggregate /// functions. See the <see cref="SQLiteFunction.Final" /> method /// for more details. /// </summary> /// <param name="contextData"> /// A placeholder for implementers to store contextual data pertaining /// to the current context. /// </param> /// <returns> /// The result of the aggregate function. /// </returns> public override object Final( object contextData /* in */ ) { if (callback == null) throw new InvalidOperationException(NoCallbackError); return callback.DynamicInvoke(GetFinalArgs(contextData)); /* throw */ } ///////////////////////////////////////////////////////////////////////// /// <summary> /// This virtual method is part of the implementation for collating /// sequences. See the <see cref="SQLiteFunction.Compare" /> method /// for more details. /// </summary> /// <param name="param1"> /// The first string to compare. /// </param> /// <param name="param2"> /// The second strnig to compare. /// </param> /// <returns> /// A positive integer if the <paramref name="param1" /> parameter is /// greater than the <paramref name="param2" /> parameter, a negative /// integer if the <paramref name="param1" /> parameter is less than /// the <paramref name="param2" /> parameter, or zero if they are /// equal. /// </returns> public override int Compare( string param1, /* in */ string param2 /* in */ ) { if (callback == null) throw new InvalidOperationException(NoCallbackError); object[] newArgs = GetCompareArgs(param1, param2); object result = callback.DynamicInvoke(newArgs); /* throw */ if (result is int) return (int)result; throw new InvalidOperationException(String.Format( ResultInt32Error, newArgs[0])); } #endregion } ///////////////////////////////////////////////////////////////////////////// /// <summary> /// Extends SQLiteFunction and allows an inherited class to obtain the collating sequence associated with a function call. /// </summary> /// <remarks> /// User-defined functions can call the GetCollationSequence() method in this class and use it to compare strings and char arrays. /// </remarks> |
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1063 1064 1065 1066 1067 1068 1069 | 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 | - + | Scalar = 0, /// <summary> /// Aggregate functions are designed to accumulate data until the end of a call and then return a result gleaned from the accumulated data. /// Examples include SUM(), COUNT(), AVG(), etc. /// </summary> Aggregate = 1, /// <summary> |
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1089 1090 1091 1092 1093 1094 1095 | 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 | - + | /// </summary> /// <param name="context">Raw context pointer for the user function</param> #if !PLATFORM_COMPACTFRAMEWORK [UnmanagedFunctionPointer(CallingConvention.Cdecl)] #endif internal delegate void SQLiteFinalCallback(IntPtr context); /// <summary> |
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Changes to System.Data.SQLite/SQLiteFunctionAttribute.cs.
1 2 3 | 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 | - + + | /******************************************************** * ADO.NET 2.0 Data Provider for SQLite Version 3.X * Written by Robert Simpson (robert@blackcastlesoft.com) |
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49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | + | FunctionType functionType ) { _name = name; _argumentCount = argumentCount; _functionType = functionType; _instanceType = null; _callback = null; } /// <summary> /// The function's name as it will be used in SQLite command text. /// </summary> public string Name { |
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80 81 82 83 84 85 86 | 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 | - + + + - - + + + + + + + + + + + + + | { get { return _functionType; } set { _functionType = value; } } /// <summary> /// The <see cref="System.Type" /> object instance that describes the class |