| 1 | // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. |
| 2 | |
| 3 | namespace WixToolset.Dtf.WindowsInstaller.Linq |
| 4 | { |
| 5 | using System; |
| 6 | using System.IO; |
| 7 | using System.Collections; |
| 8 | using System.Collections.Generic; |
| 9 | using System.Linq; |
| 10 | using System.Linq.Expressions; |
| 11 | using System.Text; |
| 12 | using System.Reflection; |
| 13 | using System.Globalization; |
| 14 | using System.Diagnostics.CodeAnalysis; |
| 15 | |
| 16 | /// <summary> |
| 17 | /// Implements the LINQ to MSI query functionality. |
| 18 | /// </summary> |
| 19 | /// <typeparam name="T">the result type of the current query -- |
| 20 | /// either some kind of QRecord, or some projection of record data</typeparam> |
| 21 | internal sealed class Query<T> : IOrderedQueryable<T>, IQueryProvider |
| 22 | { |
| 23 | private QDatabase db; |
| 24 | private Expression queryableExpression; |
| 25 | private List<TableInfo> tables; |
| 26 | private List<Type> recordTypes; |
| 27 | private List<string> selectors; |
| 28 | private string where; |
| 29 | private List<object> whereParameters; |
| 30 | private List<TableColumn> orderbyColumns; |
| 31 | private List<TableColumn> selectColumns; |
| 32 | private List<TableColumn> joinColumns; |
| 33 | private List<Delegate> projectionDelegates; |
| 34 | |
| 35 | internal Query(QDatabase db, Expression expression) |
| 36 | { |
| 37 | if (expression == null) |
| 38 | { |
| 39 | throw new ArgumentNullException("expression"); |
| 40 | } |
| 41 | |
| 42 | this.db = db; |
| 43 | this.queryableExpression = expression; |
| 44 | this.tables = new List<TableInfo>(); |
| 45 | this.recordTypes = new List<Type>(); |
| 46 | this.selectors = new List<string>(); |
| 47 | this.whereParameters = new List<object>(); |
| 48 | this.orderbyColumns = new List<TableColumn>(); |
| 49 | this.selectColumns = new List<TableColumn>(); |
| 50 | this.joinColumns = new List<TableColumn>(); |
| 51 | this.projectionDelegates = new List<Delegate>(); |
| 52 | } |
| 53 | |
| 54 | public IEnumerator<T> GetEnumerator() |
| 55 | { |
| 56 | if (this.selectColumns.Count == 0) |
| 57 | { |
| 58 | AddAllColumns(this.tables[0], this.selectColumns); |
| 59 | } |
| 60 | |
| 61 | string query = this.CompileQuery(); |
| 62 | return this.InvokeQuery(query); |
| 63 | } |
| 64 | |
| 65 | private string CompileQuery() |
| 66 | { |
| 67 | bool explicitTables = this.tables.Count > 1; |
| 68 | |
| 69 | StringBuilder queryBuilder = new StringBuilder("SELECT"); |
| 70 | |
| 71 | for (int i = 0; i < this.selectColumns.Count; i++) |
| 72 | { |
| 73 | queryBuilder.AppendFormat( |
| 74 | CultureInfo.InvariantCulture, |
| 75 | (explicitTables ? "{0} `{1}`.`{2}`" : "{0} `{2}`"), |
| 76 | (i > 0 ? "," : String.Empty), |
| 77 | this.selectColumns[i].Table.Name, |
| 78 | this.selectColumns[i].Column.Name); |
| 79 | } |
| 80 | |
| 81 | for (int i = 0; i < this.tables.Count; i++) |
| 82 | { |
| 83 | queryBuilder.AppendFormat( |
| 84 | CultureInfo.InvariantCulture, |
| 85 | "{0} `{1}`", |
| 86 | (i == 0 ? " FROM" : ","), |
| 87 | this.tables[i].Name); |
| 88 | } |
| 89 | |
| 90 | bool startedWhere = false; |
| 91 | for (int i = 0; i < this.joinColumns.Count - 1; i += 2) |
| 92 | { |
| 93 | queryBuilder.AppendFormat( |
| 94 | CultureInfo.InvariantCulture, |
| 95 | "{0} `{1}`.`{2}` = `{3}`.`{4}` ", |
| 96 | (i == 0 ? " WHERE" : "AND"), |
| 97 | this.joinColumns[i].Table, |
| 98 | this.joinColumns[i].Column, |
| 99 | this.joinColumns[i + 1].Table, |
| 100 | this.joinColumns[i + 1].Column); |
| 101 | startedWhere = true; |
| 102 | } |
| 103 | |
| 104 | if (this.where != null) |
| 105 | { |
| 106 | queryBuilder.Append(startedWhere ? "AND " : " WHERE"); |
| 107 | queryBuilder.Append(this.where); |
| 108 | } |
| 109 | |
| 110 | for (int i = 0; i < this.orderbyColumns.Count; i++) |
| 111 | { |
| 112 | VerifyOrderByColumn(this.orderbyColumns[i]); |
| 113 | |
| 114 | queryBuilder.AppendFormat( |
| 115 | CultureInfo.InvariantCulture, |
| 116 | (explicitTables ? "{0} `{1}`.`{2}`" : "{0} `{2}`"), |
| 117 | (i == 0 ? " ORDER BY" : ","), |
| 118 | this.orderbyColumns[i].Table.Name, |
| 119 | this.orderbyColumns[i].Column.Name); |
| 120 | } |
| 121 | |
| 122 | return queryBuilder.ToString(); |
| 123 | } |
| 124 | |
| 125 | private static void VerifyOrderByColumn(TableColumn tableColumn) |
| 126 | { |
| 127 | if (tableColumn.Column.Type != typeof(int) && |
| 128 | tableColumn.Column.Type != typeof(short)) |
| 129 | { |
| 130 | throw new NotSupportedException( |
| 131 | "Cannot orderby column: " + tableColumn.Column.Name + |
| 132 | "; orderby is only supported on integer fields"); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | private IEnumerator<T> InvokeQuery(string query) |
| 137 | { |
| 138 | TextWriter log = this.db.Log; |
| 139 | if (log != null) |
| 140 | { |
| 141 | log.WriteLine(); |
| 142 | log.WriteLine(query); |
| 143 | } |
| 144 | |
| 145 | using (View queryView = this.db.OpenView(query)) |
| 146 | { |
| 147 | if (this.whereParameters != null && this.whereParameters.Count > 0) |
| 148 | { |
| 149 | using (Record paramsRec = this.db.CreateRecord(this.whereParameters.Count)) |
| 150 | { |
| 151 | for (int i = 0; i < this.whereParameters.Count; i++) |
| 152 | { |
| 153 | paramsRec[i + 1] = this.whereParameters[i]; |
| 154 | |
| 155 | if (log != null) |
| 156 | { |
| 157 | log.WriteLine(" ? = " + this.whereParameters[i]); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | queryView.Execute(paramsRec); |
| 162 | } |
| 163 | } |
| 164 | else |
| 165 | { |
| 166 | queryView.Execute(); |
| 167 | } |
| 168 | |
| 169 | foreach (Record resultRec in queryView) using (resultRec) |
| 170 | { |
| 171 | yield return this.GetResult(resultRec); |
| 172 | } |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | private T GetResult(Record resultRec) |
| 177 | { |
| 178 | object[] results = new object[this.tables.Count]; |
| 179 | |
| 180 | for (int i = 0; i < this.tables.Count; i++) |
| 181 | { |
| 182 | string[] values = new string[this.tables[i].Columns.Count]; |
| 183 | for (int j = 0; j < this.selectColumns.Count; j++) |
| 184 | { |
| 185 | TableColumn col = this.selectColumns[j]; |
| 186 | if (col.Table.Name == this.tables[i].Name) |
| 187 | { |
| 188 | int index = this.tables[i].Columns.IndexOf( |
| 189 | col.Column.Name); |
| 190 | if (index >= 0) |
| 191 | { |
| 192 | if (col.Column.Type == typeof(Stream)) |
| 193 | { |
| 194 | values[index] = "[Binary Data]"; |
| 195 | } |
| 196 | else |
| 197 | { |
| 198 | values[index] = resultRec.GetString(j + 1); |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | QRecord result = (QRecord) this.recordTypes[i] |
| 205 | .GetConstructor(Type.EmptyTypes).Invoke(null); |
| 206 | result.Database = this.db; |
| 207 | result.TableInfo = this.tables[i]; |
| 208 | result.Values = values; |
| 209 | result.Exists = true; |
| 210 | results[i] = result; |
| 211 | } |
| 212 | |
| 213 | if (this.projectionDelegates.Count > 0) |
| 214 | { |
| 215 | object resultsProjection = results[0]; |
| 216 | for (int i = 1; i <= results.Length; i++) |
| 217 | { |
| 218 | if (i < results.Length) |
| 219 | { |
| 220 | resultsProjection = this.projectionDelegates[i - 1] |
| 221 | .DynamicInvoke(new object[] { resultsProjection, results[i] }); |
| 222 | } |
| 223 | else |
| 224 | { |
| 225 | resultsProjection = this.projectionDelegates[i - 1] |
| 226 | .DynamicInvoke(resultsProjection); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | return (T) resultsProjection; |
| 231 | } |
| 232 | else |
| 233 | { |
| 234 | return (T) (object) results[0]; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | IEnumerator IEnumerable.GetEnumerator() |
| 239 | { |
| 240 | return ((IEnumerable<T>) this).GetEnumerator(); |
| 241 | } |
| 242 | |
| 243 | public IQueryable<TElement> CreateQuery<TElement>(Expression expression) |
| 244 | { |
| 245 | if (expression == null) |
| 246 | { |
| 247 | throw new ArgumentNullException("expression"); |
| 248 | } |
| 249 | |
| 250 | Query<TElement> q = new Query<TElement>(this.db, expression); |
| 251 | q.tables.AddRange(this.tables); |
| 252 | q.recordTypes.AddRange(this.recordTypes); |
| 253 | q.selectors.AddRange(this.selectors); |
| 254 | q.where = this.where; |
| 255 | q.whereParameters.AddRange(this.whereParameters); |
| 256 | q.orderbyColumns.AddRange(this.orderbyColumns); |
| 257 | q.selectColumns.AddRange(this.selectColumns); |
| 258 | q.joinColumns.AddRange(this.joinColumns); |
| 259 | q.projectionDelegates.AddRange(this.projectionDelegates); |
| 260 | |
| 261 | MethodCallExpression methodCallExpression = (MethodCallExpression) expression; |
| 262 | string methodName = methodCallExpression.Method.Name; |
| 263 | if (methodName == "Select") |
| 264 | { |
| 265 | LambdaExpression argumentExpression = (LambdaExpression) |
| 266 | ((UnaryExpression) methodCallExpression.Arguments[1]).Operand; |
| 267 | q.BuildProjection(null, argumentExpression); |
| 268 | } |
| 269 | else if (methodName == "Where") |
| 270 | { |
| 271 | LambdaExpression argumentExpression = (LambdaExpression) |
| 272 | ((UnaryExpression) methodCallExpression.Arguments[1]).Operand; |
| 273 | q.BuildQuery(null, argumentExpression); |
| 274 | } |
| 275 | else if (methodName == "ThenBy") |
| 276 | { |
| 277 | LambdaExpression argumentExpression = (LambdaExpression) |
| 278 | ((UnaryExpression) methodCallExpression.Arguments[1]).Operand; |
| 279 | q.BuildSequence(null, argumentExpression); |
| 280 | } |
| 281 | else if (methodName == "Join") |
| 282 | { |
| 283 | ConstantExpression constantExpression = (ConstantExpression) |
| 284 | methodCallExpression.Arguments[1]; |
| 285 | IQueryable inner = (IQueryable) constantExpression.Value; |
| 286 | q.PerformJoin( |
| 287 | null, |
| 288 | null, |
| 289 | inner, |
| 290 | GetJoinLambda(methodCallExpression.Arguments[2]), |
| 291 | GetJoinLambda(methodCallExpression.Arguments[3]), |
| 292 | GetJoinLambda(methodCallExpression.Arguments[4])); |
| 293 | } |
| 294 | else |
| 295 | { |
| 296 | throw new NotSupportedException( |
| 297 | "Query operation not supported: " + methodName); |
| 298 | } |
| 299 | |
| 300 | return q; |
| 301 | } |
| 302 | |
| 303 | public IQueryable CreateQuery(Expression expression) |
| 304 | { |
| 305 | return this.CreateQuery<T>(expression); |
| 306 | } |
| 307 | |
| 308 | private static LambdaExpression GetJoinLambda(Expression expresion) |
| 309 | { |
| 310 | UnaryExpression unaryExpression = (UnaryExpression) expresion; |
| 311 | return (LambdaExpression) unaryExpression.Operand; |
| 312 | } |
| 313 | |
| 314 | public TResult Execute<TResult>(Expression expression) |
| 315 | { |
| 316 | throw new NotSupportedException( |
| 317 | "Direct method calls not supported -- use AsEnumerable() instead."); |
| 318 | } |
| 319 | |
| 320 | object IQueryProvider.Execute(Expression expression) |
| 321 | { |
| 322 | throw new NotSupportedException( |
| 323 | "Direct method calls not supported -- use AsEnumerable() instead."); |
| 324 | } |
| 325 | |
| 326 | public IQueryProvider Provider |
| 327 | { |
| 328 | get |
| 329 | { |
| 330 | return this; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | public Type ElementType |
| 335 | { |
| 336 | get |
| 337 | { |
| 338 | return typeof(T); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | public Expression Expression |
| 343 | { |
| 344 | get |
| 345 | { |
| 346 | return this.queryableExpression; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | internal void BuildQuery(TableInfo tableInfo, LambdaExpression expression) |
| 351 | { |
| 352 | if (tableInfo != null) |
| 353 | { |
| 354 | this.tables.Add(tableInfo); |
| 355 | this.recordTypes.Add(typeof(T)); |
| 356 | this.selectors.Add(expression.Parameters[0].Name); |
| 357 | } |
| 358 | |
| 359 | StringBuilder queryBuilder = new StringBuilder(); |
| 360 | |
| 361 | this.ParseQuery(expression.Body, queryBuilder); |
| 362 | |
| 363 | this.where = queryBuilder.ToString(); |
| 364 | } |
| 365 | |
| 366 | internal void BuildNullQuery(TableInfo tableInfo, Type recordType, LambdaExpression expression) |
| 367 | { |
| 368 | this.tables.Add(tableInfo); |
| 369 | this.recordTypes.Add(recordType); |
| 370 | this.selectors.Add(expression.Parameters[0].Name); |
| 371 | } |
| 372 | |
| 373 | private void ParseQuery(Expression expression, StringBuilder queryBuilder) |
| 374 | { |
| 375 | queryBuilder.Append("("); |
| 376 | |
| 377 | BinaryExpression binaryExpression; |
| 378 | UnaryExpression unaryExpression; |
| 379 | MethodCallExpression methodCallExpression; |
| 380 | |
| 381 | if ((binaryExpression = expression as BinaryExpression) != null) |
| 382 | { |
| 383 | switch (binaryExpression.NodeType) |
| 384 | { |
| 385 | case ExpressionType.AndAlso: |
| 386 | this.ParseQuery(binaryExpression.Left, queryBuilder); |
| 387 | queryBuilder.Append(" AND "); |
| 388 | this.ParseQuery(binaryExpression.Right, queryBuilder); |
| 389 | break; |
| 390 | |
| 391 | case ExpressionType.OrElse: |
| 392 | this.ParseQuery(binaryExpression.Left, queryBuilder); |
| 393 | queryBuilder.Append(" OR "); |
| 394 | this.ParseQuery(binaryExpression.Right, queryBuilder); |
| 395 | break; |
| 396 | |
| 397 | case ExpressionType.Equal: |
| 398 | case ExpressionType.NotEqual: |
| 399 | case ExpressionType.GreaterThan: |
| 400 | case ExpressionType.LessThan: |
| 401 | case ExpressionType.GreaterThanOrEqual: |
| 402 | case ExpressionType.LessThanOrEqual: |
| 403 | this.ParseQueryCondition(binaryExpression, queryBuilder); |
| 404 | break; |
| 405 | |
| 406 | default: |
| 407 | throw new NotSupportedException( |
| 408 | "Expression type not supported: " + binaryExpression.NodeType ); |
| 409 | } |
| 410 | } |
| 411 | else if ((unaryExpression = expression as UnaryExpression) != null) |
| 412 | { |
| 413 | throw new NotSupportedException( |
| 414 | "Expression type not supported: " + unaryExpression.NodeType); |
| 415 | } |
| 416 | else if ((methodCallExpression = expression as MethodCallExpression) != null) |
| 417 | { |
| 418 | throw new NotSupportedException( |
| 419 | "Method call not supported: " + methodCallExpression.Method.Name + "()"); |
| 420 | } |
| 421 | else |
| 422 | { |
| 423 | throw new NotSupportedException( |
| 424 | "Query filter expression not supported: " + expression); |
| 425 | } |
| 426 | |
| 427 | queryBuilder.Append(")"); |
| 428 | } |
| 429 | |
| 430 | private static ExpressionType OppositeExpression(ExpressionType e) |
| 431 | { |
| 432 | switch (e) |
| 433 | { |
| 434 | case ExpressionType.LessThan: |
| 435 | return ExpressionType.GreaterThan; |
| 436 | case ExpressionType.LessThanOrEqual: |
| 437 | return ExpressionType.GreaterThanOrEqual; |
| 438 | case ExpressionType.GreaterThan: |
| 439 | return ExpressionType.LessThan; |
| 440 | case ExpressionType.GreaterThanOrEqual: |
| 441 | return ExpressionType.LessThanOrEqual; |
| 442 | default: |
| 443 | return e; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | private static bool IsIntegerType(Type t) |
| 448 | { |
| 449 | return |
| 450 | t == typeof(sbyte) || |
| 451 | t == typeof(byte) || |
| 452 | t == typeof(short) || |
| 453 | t == typeof(ushort) || |
| 454 | t == typeof(int) || |
| 455 | t == typeof(uint) || |
| 456 | t == typeof(long) || |
| 457 | t == typeof(ulong); |
| 458 | } |
| 459 | |
| 460 | private void ParseQueryCondition( |
| 461 | BinaryExpression binaryExpression, StringBuilder queryBuilder) |
| 462 | { |
| 463 | bool swap; |
| 464 | string column = this.GetConditionColumn(binaryExpression, out swap); |
| 465 | queryBuilder.Append(column); |
| 466 | |
| 467 | ExpressionType expressionType = binaryExpression.NodeType; |
| 468 | if (swap) |
| 469 | { |
| 470 | expressionType = OppositeExpression(expressionType); |
| 471 | } |
| 472 | |
| 473 | LambdaExpression valueExpression = Expression.Lambda( |
| 474 | swap ? binaryExpression.Left : binaryExpression.Right); |
| 475 | object value = valueExpression.Compile().DynamicInvoke(); |
| 476 | |
| 477 | bool valueIsInt = false; |
| 478 | if (value != null) |
| 479 | { |
| 480 | if (IsIntegerType(value.GetType())) |
| 481 | { |
| 482 | valueIsInt = true; |
| 483 | } |
| 484 | else |
| 485 | { |
| 486 | value = value.ToString(); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | switch (expressionType) |
| 491 | { |
| 492 | case ExpressionType.Equal: |
| 493 | if (value == null) |
| 494 | { |
| 495 | queryBuilder.Append(" IS NULL"); |
| 496 | } |
| 497 | else if (valueIsInt) |
| 498 | { |
| 499 | queryBuilder.Append(" = "); |
| 500 | queryBuilder.Append(value); |
| 501 | } |
| 502 | else |
| 503 | { |
| 504 | queryBuilder.Append(" = ?"); |
| 505 | this.whereParameters.Add(value); |
| 506 | } |
| 507 | return; |
| 508 | |
| 509 | case ExpressionType.NotEqual: |
| 510 | if (value == null) |
| 511 | { |
| 512 | queryBuilder.Append(" IS NOT NULL"); |
| 513 | } |
| 514 | else if (valueIsInt) |
| 515 | { |
| 516 | queryBuilder.Append(" <> "); |
| 517 | queryBuilder.Append(value); |
| 518 | } |
| 519 | else |
| 520 | { |
| 521 | queryBuilder.Append(" <> ?"); |
| 522 | this.whereParameters.Add(value); |
| 523 | } |
| 524 | return; |
| 525 | } |
| 526 | |
| 527 | if (value == null) |
| 528 | { |
| 529 | throw new InvalidOperationException( |
| 530 | "A null value was used in a greater-than/less-than operation."); |
| 531 | } |
| 532 | |
| 533 | if (!valueIsInt) |
| 534 | { |
| 535 | throw new NotSupportedException( |
| 536 | "Greater-than/less-than operators not supported on strings."); |
| 537 | } |
| 538 | |
| 539 | switch (expressionType) |
| 540 | { |
| 541 | case ExpressionType.LessThan: |
| 542 | queryBuilder.Append(" < "); |
| 543 | break; |
| 544 | |
| 545 | case ExpressionType.LessThanOrEqual: |
| 546 | queryBuilder.Append(" <= "); |
| 547 | break; |
| 548 | |
| 549 | case ExpressionType.GreaterThan: |
| 550 | queryBuilder.Append(" > "); |
| 551 | break; |
| 552 | |
| 553 | case ExpressionType.GreaterThanOrEqual: |
| 554 | queryBuilder.Append(" >= "); |
| 555 | break; |
| 556 | |
| 557 | default: |
| 558 | throw new NotSupportedException( |
| 559 | "Unsupported query expression type: " + expressionType); |
| 560 | } |
| 561 | |
| 562 | queryBuilder.Append(value); |
| 563 | } |
| 564 | |
| 565 | private string GetConditionColumn( |
| 566 | BinaryExpression binaryExpression, out bool swap) |
| 567 | { |
| 568 | MemberExpression memberExpression; |
| 569 | MethodCallExpression methodCallExpression; |
| 570 | |
| 571 | if (((memberExpression = binaryExpression.Left as MemberExpression) != null) || |
| 572 | ((binaryExpression.Left.NodeType == ExpressionType.Convert || |
| 573 | binaryExpression.Left.NodeType == ExpressionType.ConvertChecked) && |
| 574 | (memberExpression = ((UnaryExpression) binaryExpression.Left).Operand |
| 575 | as MemberExpression) != null)) |
| 576 | { |
| 577 | string column = this.GetConditionColumn(memberExpression); |
| 578 | if (column != null) |
| 579 | { |
| 580 | swap = false; |
| 581 | return column; |
| 582 | } |
| 583 | } |
| 584 | else if (((memberExpression = binaryExpression.Right as MemberExpression) != null) || |
| 585 | ((binaryExpression.Right.NodeType == ExpressionType.Convert || |
| 586 | binaryExpression.Right.NodeType == ExpressionType.ConvertChecked) && |
| 587 | (memberExpression = ((UnaryExpression) binaryExpression.Right).Operand |
| 588 | as MemberExpression) != null)) |
| 589 | { |
| 590 | string column = this.GetConditionColumn(memberExpression); |
| 591 | if (column != null) |
| 592 | { |
| 593 | swap = true; |
| 594 | return column; |
| 595 | } |
| 596 | } |
| 597 | else if ((methodCallExpression = binaryExpression.Left as MethodCallExpression) != null) |
| 598 | { |
| 599 | string column = this.GetConditionColumn(methodCallExpression); |
| 600 | if (column != null) |
| 601 | { |
| 602 | swap = false; |
| 603 | return column; |
| 604 | } |
| 605 | } |
| 606 | else if ((methodCallExpression = binaryExpression.Right as MethodCallExpression) != null) |
| 607 | { |
| 608 | string column = this.GetConditionColumn(methodCallExpression); |
| 609 | if (column != null) |
| 610 | { |
| 611 | swap = true; |
| 612 | return column; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | throw new NotSupportedException( |
| 617 | "Unsupported binary expression: " + binaryExpression); |
| 618 | } |
| 619 | |
| 620 | private string GetConditionColumn(MemberExpression memberExpression) |
| 621 | { |
| 622 | string columnName = GetColumnName(memberExpression.Member); |
| 623 | string selectorName = GetConditionSelectorName(memberExpression.Expression); |
| 624 | string tableName = this.GetConditionTable(selectorName, columnName); |
| 625 | return this.FormatColumn(tableName, columnName); |
| 626 | } |
| 627 | |
| 628 | private string GetConditionColumn(MethodCallExpression methodCallExpression) |
| 629 | { |
| 630 | LambdaExpression argumentExpression = |
| 631 | Expression.Lambda(methodCallExpression.Arguments[0]); |
| 632 | string columnName = (string) argumentExpression.Compile().DynamicInvoke(); |
| 633 | string selectorName = GetConditionSelectorName(methodCallExpression.Object); |
| 634 | string tableName = this.GetConditionTable(selectorName, columnName); |
| 635 | return this.FormatColumn(tableName, columnName); |
| 636 | } |
| 637 | |
| 638 | private static string GetConditionSelectorName(Expression expression) |
| 639 | { |
| 640 | ParameterExpression parameterExpression; |
| 641 | MemberExpression memberExpression; |
| 642 | if ((parameterExpression = expression as ParameterExpression) != null) |
| 643 | { |
| 644 | return parameterExpression.Name; |
| 645 | } |
| 646 | else if ((memberExpression = expression as MemberExpression) != null) |
| 647 | { |
| 648 | return memberExpression.Member.Name; |
| 649 | } |
| 650 | else |
| 651 | { |
| 652 | throw new NotSupportedException( |
| 653 | "Unsupported conditional selector expression: " + expression); |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | private string GetConditionTable(string selectorName, string columnName) |
| 658 | { |
| 659 | string tableName = null; |
| 660 | |
| 661 | for (int i = 0; i < this.tables.Count; i++) |
| 662 | { |
| 663 | if (this.selectors[i] == selectorName) |
| 664 | { |
| 665 | tableName = this.tables[i].Name; |
| 666 | break; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | if (tableName == null) |
| 671 | { |
| 672 | throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, |
| 673 | "Conditional expression contains column {0}.{1} " + |
| 674 | "from a table that is not in the query.", |
| 675 | selectorName, |
| 676 | columnName)); |
| 677 | } |
| 678 | |
| 679 | return tableName; |
| 680 | } |
| 681 | |
| 682 | private string FormatColumn(string tableName, string columnName) |
| 683 | { |
| 684 | if (tableName != null && this.tables.Count > 1) |
| 685 | { |
| 686 | return String.Format(CultureInfo.InvariantCulture, "`{0}`.`{1}`", tableName, columnName); |
| 687 | } |
| 688 | else |
| 689 | { |
| 690 | return String.Format(CultureInfo.InvariantCulture, "`{0}`", columnName); |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | private static string GetColumnName(MemberInfo memberInfo) |
| 695 | { |
| 696 | foreach (var attr in memberInfo.GetCustomAttributes( |
| 697 | typeof(DatabaseColumnAttribute), false)) |
| 698 | { |
| 699 | return ((DatabaseColumnAttribute) attr).Column; |
| 700 | } |
| 701 | |
| 702 | return memberInfo.Name; |
| 703 | } |
| 704 | |
| 705 | internal void BuildProjection(TableInfo tableInfo, LambdaExpression expression) |
| 706 | { |
| 707 | if (tableInfo != null) |
| 708 | { |
| 709 | this.tables.Add(tableInfo); |
| 710 | this.recordTypes.Add(typeof(T)); |
| 711 | this.selectors.Add(expression.Parameters[0].Name); |
| 712 | } |
| 713 | |
| 714 | this.FindColumns(expression, this.selectColumns); |
| 715 | this.projectionDelegates.Add(expression.Compile()); |
| 716 | } |
| 717 | |
| 718 | internal void BuildSequence(TableInfo tableInfo, LambdaExpression expression) |
| 719 | { |
| 720 | if (tableInfo != null) |
| 721 | { |
| 722 | this.tables.Add(tableInfo); |
| 723 | this.recordTypes.Add(typeof(T)); |
| 724 | this.selectors.Add(expression.Parameters[0].Name); |
| 725 | } |
| 726 | |
| 727 | this.FindColumns(expression.Body, this.orderbyColumns); |
| 728 | } |
| 729 | |
| 730 | private static void AddAllColumns(TableInfo tableInfo, IList<TableColumn> columnList) |
| 731 | { |
| 732 | foreach (ColumnInfo column in tableInfo.Columns) |
| 733 | { |
| 734 | columnList.Add(new TableColumn(tableInfo, column)); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")] |
| 739 | private void FindColumns(Expression expression, IList<TableColumn> columnList) |
| 740 | { |
| 741 | if (expression is ParameterExpression) |
| 742 | { |
| 743 | ParameterExpression e = expression as ParameterExpression; |
| 744 | string selector = e.Name; |
| 745 | for (int i = 0; i < this.tables.Count; i++) |
| 746 | { |
| 747 | if (this.selectors[i] == selector) |
| 748 | { |
| 749 | AddAllColumns(this.tables[i], columnList); |
| 750 | break; |
| 751 | } |
| 752 | } |
| 753 | } |
| 754 | else if (expression.NodeType == ExpressionType.MemberAccess) |
| 755 | { |
| 756 | this.FindColumns(expression as MemberExpression, columnList); |
| 757 | } |
| 758 | else if (expression is MethodCallExpression) |
| 759 | { |
| 760 | this.FindColumns(expression as MethodCallExpression, columnList); |
| 761 | } |
| 762 | else if (expression is BinaryExpression) |
| 763 | { |
| 764 | BinaryExpression e = expression as BinaryExpression; |
| 765 | this.FindColumns(e.Left, columnList); |
| 766 | this.FindColumns(e.Right, columnList); |
| 767 | } |
| 768 | else if (expression is UnaryExpression) |
| 769 | { |
| 770 | UnaryExpression e = expression as UnaryExpression; |
| 771 | this.FindColumns(e.Operand, columnList); |
| 772 | } |
| 773 | else if (expression is ConditionalExpression) |
| 774 | { |
| 775 | ConditionalExpression e = expression as ConditionalExpression; |
| 776 | this.FindColumns(e.Test, columnList); |
| 777 | this.FindColumns(e.IfTrue, columnList); |
| 778 | this.FindColumns(e.IfFalse, columnList); |
| 779 | } |
| 780 | else if (expression is InvocationExpression) |
| 781 | { |
| 782 | InvocationExpression e = expression as InvocationExpression; |
| 783 | this.FindColumns(e.Expression, columnList); |
| 784 | this.FindColumns(e.Arguments, columnList); |
| 785 | } |
| 786 | else if (expression is LambdaExpression) |
| 787 | { |
| 788 | LambdaExpression e = expression as LambdaExpression; |
| 789 | this.FindColumns(e.Body, columnList); |
| 790 | } |
| 791 | else if (expression is ListInitExpression) |
| 792 | { |
| 793 | ListInitExpression e = expression as ListInitExpression; |
| 794 | this.FindColumns(e.NewExpression, columnList); |
| 795 | foreach (ElementInit ei in e.Initializers) |
| 796 | { |
| 797 | this.FindColumns(ei.Arguments, columnList); |
| 798 | } |
| 799 | } |
| 800 | else if (expression is MemberInitExpression) |
| 801 | { |
| 802 | MemberInitExpression e = expression as MemberInitExpression; |
| 803 | this.FindColumns(e.NewExpression, columnList); |
| 804 | foreach (MemberAssignment b in e.Bindings) |
| 805 | { |
| 806 | this.FindColumns(b.Expression, columnList); |
| 807 | } |
| 808 | } |
| 809 | else if (expression is NewExpression) |
| 810 | { |
| 811 | NewExpression e = expression as NewExpression; |
| 812 | this.FindColumns(e.Arguments, columnList); |
| 813 | } |
| 814 | else if (expression is NewArrayExpression) |
| 815 | { |
| 816 | NewArrayExpression e = expression as NewArrayExpression; |
| 817 | this.FindColumns(e.Expressions, columnList); |
| 818 | } |
| 819 | else if (expression is TypeBinaryExpression) |
| 820 | { |
| 821 | TypeBinaryExpression e = expression as TypeBinaryExpression; |
| 822 | this.FindColumns(e.Expression, columnList); |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | private void FindColumns(IEnumerable<Expression> expressions, IList<TableColumn> columnList) |
| 827 | { |
| 828 | foreach (Expression expression in expressions) |
| 829 | { |
| 830 | this.FindColumns(expression, columnList); |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | private void FindColumns(MemberExpression memberExpression, IList<TableColumn> columnList) |
| 835 | { |
| 836 | string selector = null; |
| 837 | MemberExpression objectMemberExpression; |
| 838 | ParameterExpression objectParameterExpression; |
| 839 | if ((objectParameterExpression = memberExpression.Expression as |
| 840 | ParameterExpression) != null) |
| 841 | { |
| 842 | selector = objectParameterExpression.Name; |
| 843 | } |
| 844 | else if ((objectMemberExpression = memberExpression.Expression as |
| 845 | MemberExpression) != null) |
| 846 | { |
| 847 | selector = objectMemberExpression.Member.Name; |
| 848 | } |
| 849 | |
| 850 | if (selector != null) |
| 851 | { |
| 852 | for (int i = 0; i < this.tables.Count; i++) |
| 853 | { |
| 854 | if (this.selectors[i] == selector) |
| 855 | { |
| 856 | string columnName = GetColumnName(memberExpression.Member); |
| 857 | ColumnInfo column = this.tables[i].Columns[columnName]; |
| 858 | columnList.Add(new TableColumn(this.tables[i], column)); |
| 859 | break; |
| 860 | } |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | selector = memberExpression.Member.Name; |
| 865 | for (int i = 0; i < this.tables.Count; i++) |
| 866 | { |
| 867 | if (this.selectors[i] == selector) |
| 868 | { |
| 869 | AddAllColumns(this.tables[i], columnList); |
| 870 | break; |
| 871 | } |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | private void FindColumns(MethodCallExpression methodCallExpression, IList<TableColumn> columnList) |
| 876 | { |
| 877 | if (methodCallExpression.Method.Name == "get_Item" && |
| 878 | methodCallExpression.Arguments.Count == 1 && |
| 879 | methodCallExpression.Arguments[0].Type == typeof(string)) |
| 880 | { |
| 881 | string selector = null; |
| 882 | MemberExpression objectMemberExpression; |
| 883 | ParameterExpression objectParameterExpression; |
| 884 | if ((objectParameterExpression = methodCallExpression.Object as ParameterExpression) != null) |
| 885 | { |
| 886 | selector = objectParameterExpression.Name; |
| 887 | } |
| 888 | else if ((objectMemberExpression = methodCallExpression.Object as MemberExpression) != null) |
| 889 | { |
| 890 | selector = objectMemberExpression.Member.Name; |
| 891 | } |
| 892 | |
| 893 | if (selector != null) |
| 894 | { |
| 895 | for (int i = 0; i < this.tables.Count; i++) |
| 896 | { |
| 897 | if (this.selectors[i] == selector) |
| 898 | { |
| 899 | LambdaExpression argumentExpression = |
| 900 | Expression.Lambda(methodCallExpression.Arguments[0]); |
| 901 | string columnName = (string) |
| 902 | argumentExpression.Compile().DynamicInvoke(); |
| 903 | ColumnInfo column = this.tables[i].Columns[columnName]; |
| 904 | columnList.Add(new TableColumn(this.tables[i], column)); |
| 905 | break; |
| 906 | } |
| 907 | } |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | if (methodCallExpression.Object != null && methodCallExpression.Object.NodeType != ExpressionType.Parameter) |
| 912 | { |
| 913 | this.FindColumns(methodCallExpression.Object, columnList); |
| 914 | } |
| 915 | } |
| 916 | |
| 917 | internal void PerformJoin( |
| 918 | TableInfo tableInfo, |
| 919 | Type recordType, |
| 920 | IQueryable joinTable, |
| 921 | LambdaExpression outerKeySelector, |
| 922 | LambdaExpression innerKeySelector, |
| 923 | LambdaExpression resultSelector) |
| 924 | { |
| 925 | if (joinTable == null) |
| 926 | { |
| 927 | throw new ArgumentNullException("joinTable"); |
| 928 | } |
| 929 | |
| 930 | if (tableInfo != null) |
| 931 | { |
| 932 | this.tables.Add(tableInfo); |
| 933 | this.recordTypes.Add(recordType); |
| 934 | this.selectors.Add(outerKeySelector.Parameters[0].Name); |
| 935 | } |
| 936 | |
| 937 | PropertyInfo tableInfoProp = joinTable.GetType().GetProperty("TableInfo"); |
| 938 | if (tableInfoProp == null) |
| 939 | { |
| 940 | throw new NotSupportedException( |
| 941 | "Cannot join with object: " + joinTable.GetType().Name + |
| 942 | "; join is only supported on another QTable."); |
| 943 | } |
| 944 | |
| 945 | TableInfo joinTableInfo = (TableInfo) tableInfoProp.GetValue(joinTable, null); |
| 946 | if (joinTableInfo == null) |
| 947 | { |
| 948 | throw new InvalidOperationException("Missing join table info."); |
| 949 | } |
| 950 | |
| 951 | this.tables.Add(joinTableInfo); |
| 952 | this.recordTypes.Add(joinTable.ElementType); |
| 953 | this.selectors.Add(innerKeySelector.Parameters[0].Name); |
| 954 | this.projectionDelegates.Add(resultSelector.Compile()); |
| 955 | |
| 956 | int joinColumnCount = this.joinColumns.Count; |
| 957 | this.FindColumns(outerKeySelector.Body, this.joinColumns); |
| 958 | if (this.joinColumns.Count > joinColumnCount + 1) |
| 959 | { |
| 960 | throw new NotSupportedException("Join operations involving " + |
| 961 | "multiple columns are not supported."); |
| 962 | } |
| 963 | else if (this.joinColumns.Count != joinColumnCount + 1) |
| 964 | { |
| 965 | throw new InvalidOperationException("Bad outer key selector for join."); |
| 966 | } |
| 967 | |
| 968 | this.FindColumns(innerKeySelector.Body, this.joinColumns); |
| 969 | if (this.joinColumns.Count > joinColumnCount + 2) |
| 970 | { |
| 971 | throw new NotSupportedException("Join operations involving " + |
| 972 | "multiple columns not are supported."); |
| 973 | } |
| 974 | if (this.joinColumns.Count != joinColumnCount + 2) |
| 975 | { |
| 976 | throw new InvalidOperationException("Bad inner key selector for join."); |
| 977 | } |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | internal class TableColumn |
| 982 | { |
| 983 | public TableColumn(TableInfo table, ColumnInfo column) |
| 984 | { |
| 985 | this.Table = table; |
| 986 | this.Column = column; |
| 987 | } |
| 988 | |
| 989 | public TableInfo Table { get; set; } |
| 990 | public ColumnInfo Column { get; set; } |
| 991 | } |
| 992 | } |