mcs/class/System.Data/System.Data.SqlClient/SqlCommand.cs

   1 //
   2 // System.Data.SqlClient.SqlCommand.cs
   3 //
   4 // Author:
   5 //   Rodrigo Moya (rodrigo@ximian.com)
   6 //   Daniel Morgan (danmorg@sc.rr.com)
   7 //   Tim Coleman (tim@timcoleman.com)
   8 //   Diego Caravana (diego@toth.it)
   9 //
  10 // (C) Ximian, Inc 2002 http://www.ximian.com/
  11 // (C) Daniel Morgan, 2002
  12 // Copyright (C) Tim Coleman, 2002
  13 //
  14
  15 //
  16 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  17 //
  18 // Permission is hereby granted, free of charge, to any person obtaining
  19 // a copy of this software and associated documentation files (the
  20 // "Software"), to deal in the Software without restriction, including
  21 // without limitation the rights to use, copy, modify, merge, publish,
  22 // distribute, sublicense, and/or sell copies of the Software, and to
  23 // permit persons to whom the Software is furnished to do so, subject to
  24 // the following conditions:
  25 //
  26 // The above copyright notice and this permission notice shall be
  27 // included in all copies or substantial portions of the Software.
  28 //
  29 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  33 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  34 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  35 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  36 //
  37
  38 using Mono.Data.Tds;
  39 using Mono.Data.Tds.Protocol;
  40 using System;
  41 using System.IO;
  42 using System.Collections;
  43 using System.Collections.Specialized;
  44 using System.ComponentModel;
  45 using System.Data;
  46 using System.Data.Common;
  47 #if NET_2_0
  48 using System.Data.Sql;
  49 #endif
  50 using System.Runtime.InteropServices;
  51 using System.Text;
  52 using System.Xml;
  53
  54 namespace System.Data.SqlClient {
  55         [DesignerAttribute ("Microsoft.VSDesigner.Data.VS.SqlCommandDesigner, "+ Consts.AssemblyMicrosoft_VSDesigner, "System.ComponentModel.Design.IDesigner")]
  56         [ToolboxItemAttribute ("System.Drawing.Design.ToolboxItem, "+ Consts.AssemblySystem_Drawing)]
  57 #if NET_2_0
  58         [DefaultEventAttribute ("RecordsAffected")]
  59         public sealed class SqlCommand : DbCommand, IDbCommand, ICloneable
  60 #else
  61         public sealed class SqlCommand : Component, IDbCommand, ICloneable
  62 #endif // NET_2_0
  63         {
  64                 #region Fields
  65
  66                 const int DEFAULT_COMMAND_TIMEOUT = 30;
  67
  68                 int commandTimeout;
  69                 bool designTimeVisible;
  70                 string commandText;
  71                 CommandType commandType;
  72                 SqlConnection connection;
  73                 SqlTransaction transaction;
  74                 UpdateRowSource updatedRowSource;
  75                 CommandBehavior behavior = CommandBehavior.Default;
  76                 SqlParameterCollection parameters;
  77                 string preparedStatement;
  78 #if NET_2_0
  79                 bool disposed;
  80                 SqlNotificationRequest notification;
  81                 bool notificationAutoEnlist;
  82 #endif
  83
  84                 #endregion // Fields
  85
  86                 #region Constructors
  87
  88                 public SqlCommand()
  89                         : this (String.Empty, null, null)
  90                 {
  91                 }
  92
  93                 public SqlCommand (string cmdText)
  94                         : this (cmdText, null, null)
  95                 {
  96                 }
  97
  98                 public SqlCommand (string cmdText, SqlConnection connection)
  99                         : this (cmdText, connection, null)
 100                 {
 101                 }
 102
 103                 public SqlCommand (string cmdText, SqlConnection connection, SqlTransaction transaction)
 104                 {
 105                         this.commandText = cmdText;
 106                         this.connection = connection;
 107                         this.transaction = transaction;
 108                         this.commandType = CommandType.Text;
 109                         this.updatedRowSource = UpdateRowSource.Both;
 110
 111                         this.commandTimeout = DEFAULT_COMMAND_TIMEOUT;
 112 #if NET_2_0
 113                         notificationAutoEnlist = true;
 114 #endif
 115                         designTimeVisible = true;
 116                         parameters = new SqlParameterCollection (this);
 117                 }
 118
 119                 private SqlCommand(string commandText, SqlConnection connection, SqlTransaction transaction, CommandType commandType, UpdateRowSource updatedRowSource, bool designTimeVisible, int commandTimeout, SqlParameterCollection parameters)
 120                 {
 121                         this.commandText = commandText;
 122                         this.connection = connection;
 123                         this.transaction = transaction;
 124                         this.commandType = commandType;
 125                         this.updatedRowSource = updatedRowSource;
 126                         this.designTimeVisible = designTimeVisible;
 127                         this.commandTimeout = commandTimeout;
 128                         this.parameters = new SqlParameterCollection(this);
 129                         for (int i = 0;i < parameters.Count;i++)
 130                                 this.parameters.Add(((ICloneable)parameters[i]).Clone());
 131                 }
 132
 133                 #endregion // Constructors
 134
 135                 #region Properties
 136
 137                 internal CommandBehavior CommandBehavior {
 138                         get { return behavior; }
 139                 }
 140
 141 #if !NET_2_0
 142                 [DataSysDescription ("Command text to execute.")]
 143 #endif
 144                 [DefaultValue ("")]
 145                 [EditorAttribute ("Microsoft.VSDesigner.Data.SQL.Design.SqlCommandTextEditor, "+ Consts.AssemblyMicrosoft_VSDesigner, "System.Drawing.Design.UITypeEditor, "+ Consts.AssemblySystem_Drawing )]
 146                 [RefreshProperties (RefreshProperties.All)]
 147                 public
 148 #if NET_2_0
 149                 override
 150 #endif //NET_2_0
 151                 string CommandText {
 152                         get {
 153                                 if (commandText == null)
 154                                         return string.Empty;
 155                                 return commandText;
 156                         }
 157                         set {
 158                                 if (value != commandText && preparedStatement != null)
 159                                         Unprepare ();
 160                                 commandText = value;
 161                         }
 162                 }
 163
 164 #if !NET_2_0
 165                 [DataSysDescription ("Time to wait for command to execute.")]
 166                 [DefaultValue (DEFAULT_COMMAND_TIMEOUT)]
 167 #endif
 168                 public
 169 #if NET_2_0
 170                 override
 171 #endif //NET_2_0
 172                 int CommandTimeout {
 173                         get { return commandTimeout; }
 174                         set {
 175                                 if (value < 0)
 176 #if NET_2_0
 177                                         throw new ArgumentException ("The property value assigned is less than 0.",
 178                                                 "CommandTimeout");
 179 #else
 180                                         throw new ArgumentException ("The property value assigned is less than 0.");
 181 #endif
 182                                 commandTimeout = value;
 183                         }
 184                 }
 185
 186 #if !NET_2_0
 187                 [DataSysDescription ("How to interpret the CommandText.")]
 188 #endif
 189                 [DefaultValue (CommandType.Text)]
 190                 [RefreshProperties (RefreshProperties.All)]
 191                 public
 192 #if NET_2_0
 193                 override
 194 #endif //NET_2_0
 195                 CommandType CommandType {
 196                         get { return commandType; }
 197                         set {
 198                                 if (value == CommandType.TableDirect)
 199 #if NET_2_0
 200                                         throw new ArgumentOutOfRangeException ("CommandType.TableDirect is not supported " +
 201                                                 "by the Mono SqlClient Data Provider.");
 202 #else
 203                                         throw new ArgumentException ("CommandType.TableDirect is not supported by the Mono SqlClient Data Provider.");
 204 #endif
 205
 206                                 ExceptionHelper.CheckEnumValue (typeof (CommandType), value);
 207                                 commandType = value;
 208                         }
 209                 }
 210
 211                 [DefaultValue (null)]
 212 #if !NET_2_0
 213                 [DataSysDescription ("Connection used by the command.")]
 214 #endif
 215                 [EditorAttribute ("Microsoft.VSDesigner.Data.Design.DbConnectionEditor, "+ Consts.AssemblyMicrosoft_VSDesigner, "System.Drawing.Design.UITypeEditor, "+ Consts.AssemblySystem_Drawing )]
 216                 public
 217 #if NET_2_0
 218                 new
 219 #endif //NET_2_0
 220                 SqlConnection Connection {
 221                         get { return connection; }
 222                         set
 223                         {
 224 #if ONLY_1_1
 225                                 if (connection != null && connection.DataReader != null)
 226                                         throw new InvalidOperationException ("The connection is busy fetching data.");
 227 #endif
 228                                 connection = value;
 229                         }
 230                 }
 231
 232                 [Browsable (false)]
 233                 [DefaultValue (true)]
 234                 [DesignOnly (true)]
 235 #if NET_2_0
 236                 [EditorBrowsable (EditorBrowsableState.Never)]
 237 #endif
 238                 public
 239 #if NET_2_0
 240                 override
 241 #endif //NET_2_0
 242                 bool DesignTimeVisible {
 243                         get { return designTimeVisible; }
 244                         set { designTimeVisible = value; }
 245                 }
 246
 247 #if !NET_2_0
 248                 [DataSysDescription ("The parameters collection.")]
 249 #endif
 250                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 251                 public
 252 #if NET_2_0
 253                 new
 254 #endif //NET_2_0
 255                 SqlParameterCollection Parameters {
 256                         get { return parameters; }
 257                 }
 258
 259                 internal Tds Tds {
 260                         get { return Connection.Tds; }
 261                 }
 262
 263 #if !NET_2_0
 264                 IDbConnection IDbCommand.Connection {
 265                         get { return Connection; }
 266                         set {
 267                                 if (!(value == null || value is SqlConnection))
 268                                         throw new InvalidCastException ("The value was not a valid SqlConnection.");
 269                                 Connection = (SqlConnection) value;
 270                         }
 271                 }
 272
 273                 IDataParameterCollection IDbCommand.Parameters {
 274                         get { return Parameters; }
 275                 }
 276
 277                 IDbTransaction IDbCommand.Transaction {
 278                         get { return Transaction; }
 279                         set {
 280                                 if (!(value == null || value is SqlTransaction))
 281                                         throw new ArgumentException ();
 282                                 Transaction = (SqlTransaction) value;
 283                         }
 284                 }
 285 #endif
 286
 287                 [Browsable (false)]
 288 #if !NET_2_0
 289                 [DataSysDescription ("The transaction used by the command.")]
 290 #endif
 291                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 292                 public new SqlTransaction Transaction {
 293                         get {
 294                                 if (transaction != null && !transaction.IsOpen)
 295                                         transaction = null;
 296                                 return transaction;
 297                         }
 298                         set
 299                         {
 300 #if ONLY_1_1
 301                                 if (connection != null && connection.DataReader != null)
 302                                         throw new InvalidOperationException ("The connection is busy fetching data.");
 303 #endif
 304                                 transaction = value;
 305                         }
 306                 }
 307
 308 #if !NET_2_0
 309                 [DataSysDescription ("When used by a DataAdapter.Update, how command results are applied to the current DataRow.")]
 310 #endif
 311                 [DefaultValue (UpdateRowSource.Both)]
 312                 public
 313 #if NET_2_0
 314                 override
 315 #endif // NET_2_0
 316                 UpdateRowSource UpdatedRowSource {
 317                         get { return updatedRowSource; }
 318                         set {
 319                                 ExceptionHelper.CheckEnumValue (typeof (UpdateRowSource), value);
 320                                 updatedRowSource = value;
 321                         }
 322                 }
 323
 324 #if NET_2_0
 325                 [Browsable (false)]
 326                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 327                 public SqlNotificationRequest Notification {
 328                         get { return notification; }
 329                         set { notification = value; }
 330                 }
 331
 332                 [DefaultValue (true)]
 333                 public bool NotificationAutoEnlist {
 334                         get { return notificationAutoEnlist; }
 335                         set { notificationAutoEnlist = value; }
 336                 }
 337 #endif
 338                 #endregion // Fields
 339
 340                 #region Methods
 341
 342                 public
 343 #if NET_2_0
 344                 override
 345 #endif // NET_2_0
 346                 void Cancel ()
 347                 {
 348                         if (Connection == null || Connection.Tds == null)
 349                                 return;
 350                         Connection.Tds.Cancel ();
 351                 }
 352
 353 #if NET_2_0
 354                 public SqlCommand Clone ()
 355                 {
 356                         return new SqlCommand (commandText, connection, transaction, commandType, updatedRowSource, designTimeVisible, commandTimeout, parameters);
 357                 }
 358 #endif // NET_2_0
 359
 360                 internal void CloseDataReader ()
 361                 {
 362                         if (Connection != null) {
 363                                 Connection.DataReader = null;
 364
 365                                 if ((behavior & CommandBehavior.CloseConnection) != 0)
 366                                         Connection.Close ();
 367
 368                                 if (Tds != null)
 369                                         Tds.SequentialAccess = false;
 370                         }
 371
 372                         // Reset the behavior
 373                         behavior = CommandBehavior.Default;
 374                 }
 375
 376                 public new SqlParameter CreateParameter ()
 377                 {
 378                         return new SqlParameter ();
 379                 }
 380
 381                 private string EscapeProcName (string name, bool schema)
 382                 {
 383                         string procName;
 384                         string tmpProcName = name.Trim ();
 385                         int procNameLen = tmpProcName.Length;
 386                         char[] brkts = new char [] {'[', ']'};
 387                         bool foundMatching = false;
 388                         int start = 0, count = procNameLen;
 389                         int sindex = -1, eindex = -1;
 390
 391                         // We try to match most of the "brackets" combination here, however
 392                         // there could be other combinations that may generate a different type
 393                         // of exception in MS.NET
 394
 395                         if (procNameLen > 1) {
 396                                 if ((sindex = tmpProcName.IndexOf ('[')) <= 0)
 397                                         foundMatching = true;
 398                                 else
 399                                         foundMatching = false;
 400
 401                                 if (foundMatching == true && sindex > -1) {
 402                                         eindex = tmpProcName.IndexOf (']');
 403                                         if (sindex > eindex && eindex != -1) {
 404                                                 foundMatching = false;
 405                                         } else if (eindex == procNameLen-1) {
 406                                                 if (tmpProcName.IndexOfAny (brkts, 1, procNameLen-2) != -1) {
 407                                                         foundMatching = false;
 408                                                 } else {
 409                                                         start = 1;
 410                                                         count = procNameLen - 2;
 411                                                 }
 412                                         } else if (eindex == -1 && schema) {
 413                                                 foundMatching = true;
 414                                         } else {
 415                                                 foundMatching = false;
 416                                         }
 417                                 }
 418
 419                                 if (foundMatching)
 420                                         procName = tmpProcName.Substring (start, count);
 421                                 else
 422                                         throw new ArgumentException (String.Format ("SqlCommand.CommandText property value is an invalid multipart name {0}, incorrect usage of quotes", CommandText));
 423                         } else {
 424                                 procName = tmpProcName;
 425                         }
 426
 427                         return procName;
 428                 }
 429                 internal void DeriveParameters ()
 430                 {
 431                         if (commandType != CommandType.StoredProcedure)
 432                                 throw new InvalidOperationException (String.Format ("SqlCommand DeriveParameters only supports CommandType.StoredProcedure, not CommandType.{0}", commandType));
 433                         ValidateCommand ("DeriveParameters", false);
 434
 435                         string procName = CommandText;
 436                         string schemaName = String.Empty;
 437                         int dotPosition = procName.IndexOf ('.');
 438                         if (dotPosition >= 0) {
 439                                 schemaName = procName.Substring (0, dotPosition);
 440                                 procName = procName.Substring (dotPosition + 1);
 441                         }
 442
 443                         procName = EscapeProcName (procName, false);
 444                         schemaName = EscapeProcName (schemaName, true);
 445
 446                         SqlParameterCollection localParameters = new SqlParameterCollection (this);
 447                         localParameters.Add ("@procedure_name", SqlDbType.NVarChar, procName.Length).Value = procName;
 448                         if (schemaName.Length > 0)
 449                                 localParameters.Add ("@procedure_schema", SqlDbType.NVarChar, schemaName.Length).Value = schemaName;
 450
 451                         string sql = "sp_procedure_params_rowset";
 452
 453                         try {
 454                                 Connection.Tds.ExecProc (sql, localParameters.MetaParameters, 0, true);
 455                         } catch (TdsTimeoutException ex) {
 456                                 Connection.Tds.Reset ();
 457                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 458                         } catch (TdsInternalException ex) {
 459                                 Connection.Close ();
 460                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 461                         }
 462
 463                         SqlDataReader reader = new SqlDataReader (this);
 464                         parameters.Clear ();
 465                         object[] dbValues = new object[reader.FieldCount];
 466
 467                         while (reader.Read ()) {
 468                                 reader.GetValues (dbValues);
 469                                 parameters.Add (new SqlParameter (dbValues));
 470                         }
 471                         reader.Close ();
 472
 473                         if (parameters.Count == 0)
 474                                 throw new InvalidOperationException ("Stored procedure '" + procName + "' does not exist.");
 475                 }
 476
 477                 private void Execute (bool wantResults)
 478                 {
 479                         int index = 0;
 480                         Connection.Tds.RecordsAffected = -1;
 481                         TdsMetaParameterCollection parms = Parameters.MetaParameters;
 482                         foreach (TdsMetaParameter param in parms) {
 483                                 param.Validate (index++);
 484                         }
 485
 486                         if (preparedStatement == null) {
 487                                 bool schemaOnly = ((behavior & CommandBehavior.SchemaOnly) > 0);
 488                                 bool keyInfo = ((behavior & CommandBehavior.KeyInfo) > 0);
 489
 490                                 StringBuilder sql1 = new StringBuilder ();
 491                                 StringBuilder sql2 = new StringBuilder ();
 492
 493                                 if (schemaOnly || keyInfo)
 494                                         sql1.Append ("SET FMTONLY OFF;");
 495                                 if (keyInfo) {
 496                                         sql1.Append ("SET NO_BROWSETABLE ON;");
 497                                         sql2.Append ("SET NO_BROWSETABLE OFF;");
 498                                 }
 499                                 if (schemaOnly) {
 500                                         sql1.Append ("SET FMTONLY ON;");
 501                                         sql2.Append ("SET FMTONLY OFF;");
 502                                 }
 503
 504                                 switch (CommandType) {
 505                                 case CommandType.StoredProcedure:
 506                                         try {
 507                                                 if (keyInfo || schemaOnly)
 508                                                         Connection.Tds.Execute (sql1.ToString ());
 509                                                 Connection.Tds.ExecProc (CommandText, parms, CommandTimeout, wantResults);
 510                                                 if (keyInfo || schemaOnly)
 511                                                         Connection.Tds.Execute (sql2.ToString ());
 512                                         } catch (TdsTimeoutException ex) {
 513                                                 // If it is a timeout exception there can be many reasons:
 514                                                 // 1) Network is down/server is down/not reachable
 515                                                 // 2) Somebody has an exclusive lock on Table/DB
 516                                                 // In any of these cases, don't close the connection. Let the user do it
 517                                                 Connection.Tds.Reset ();
 518                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 519                                         } catch (TdsInternalException ex) {
 520                                                 Connection.Close ();
 521                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 522                                         }
 523                                         break;
 524                                 case CommandType.Text:
 525                                         string sql;
 526                                         if (sql2.Length > 0) {
 527                                                 sql = String.Format ("{0}{1};{2}", sql1.ToString (), CommandText, sql2.ToString ());
 528                                         } else {
 529                                                 sql = String.Format ("{0}{1}", sql1.ToString (), CommandText);
 530                                         }
 531                                         try {
 532                                                 Connection.Tds.Execute (sql, parms, CommandTimeout, wantResults);
 533                                         } catch (TdsTimeoutException ex) {
 534                                                 Connection.Tds.Reset ();
 535                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 536                                         } catch (TdsInternalException ex) {
 537                                                 Connection.Close ();
 538                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 539                                         }
 540                                         break;
 541                                 }
 542                         }
 543                         else {
 544                                 try {
 545                                         Connection.Tds.ExecPrepared (preparedStatement, parms, CommandTimeout, wantResults);
 546                                 } catch (TdsTimeoutException ex) {
 547                                         Connection.Tds.Reset ();
 548                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 549                                 } catch (TdsInternalException ex) {
 550                                         Connection.Close ();
 551                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 552                                 }
 553                         }
 554                 }
 555
 556                 public
 557 #if NET_2_0
 558                 override
 559 #endif // NET_2_0
 560                 int ExecuteNonQuery ()
 561                 {
 562                         ValidateCommand ("ExecuteNonQuery", false);
 563                         int result = 0;
 564                         behavior = CommandBehavior.Default;
 565
 566                         try {
 567                                 Execute (false);
 568                                 result = Connection.Tds.RecordsAffected;
 569                         } catch (TdsTimeoutException e) {
 570                                 Connection.Tds.Reset ();
 571                                 throw SqlException.FromTdsInternalException ((TdsInternalException) e);
 572                         }
 573
 574                         GetOutputParameters ();
 575                         return result;
 576                 }
 577
 578                 public new SqlDataReader ExecuteReader ()
 579                 {
 580                         return ExecuteReader (CommandBehavior.Default);
 581                 }
 582
 583                 public new SqlDataReader ExecuteReader (CommandBehavior behavior)
 584                 {
 585                         ValidateCommand ("ExecuteReader", false);
 586                         if ((behavior & CommandBehavior.SingleRow) != 0)
 587                                 behavior |= CommandBehavior.SingleResult;
 588                         this.behavior = behavior;
 589                         if ((behavior & CommandBehavior.SequentialAccess) != 0)
 590                                 Tds.SequentialAccess = true;
 591                         try {
 592                                 Execute (true);
 593                                 Connection.DataReader = new SqlDataReader (this);
 594                                 return Connection.DataReader;
 595                         } catch {
 596                                 if ((behavior & CommandBehavior.CloseConnection) != 0)
 597                                         Connection.Close ();
 598                                 throw;
 599                         }
 600                 }
 601
 602                 public
 603 #if NET_2_0
 604                 override
 605 #endif // NET_2_0
 606                 object ExecuteScalar ()
 607                 {
 608                         try {
 609                                 object result = null;
 610 #if NET_2_0
 611                                 ValidateCommand ("ExecuteScalar", false);
 612 #else
 613                                 ValidateCommand ("ExecuteReader", false);
 614 #endif
 615                                 behavior = CommandBehavior.Default;
 616                                 Execute (true);
 617
 618                                 try {
 619                                         if (Connection.Tds.NextResult () && Connection.Tds.NextRow ())
 620                                                 result = Connection.Tds.ColumnValues[0];
 621
 622                                         if (commandType == CommandType.StoredProcedure) {
 623                                                 Connection.Tds.SkipToEnd ();
 624                                                 GetOutputParameters ();
 625                                         }
 626                                 } catch (TdsTimeoutException ex) {
 627                                         Connection.Tds.Reset ();
 628                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 629                                 } catch (TdsInternalException ex) {
 630                                         Connection.Close ();
 631                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 632                                 }
 633
 634                                 return result;
 635                         } finally {
 636                                 CloseDataReader ();
 637                         }
 638                 }
 639
 640                 public XmlReader ExecuteXmlReader ()
 641                 {
 642                         ValidateCommand ("ExecuteXmlReader", false);
 643                         behavior = CommandBehavior.Default;
 644                         try {
 645                                 Execute (true);
 646                         } catch (TdsTimeoutException e) {
 647                                 Connection.Tds.Reset ();
 648                                 throw SqlException.FromTdsInternalException ((TdsInternalException) e);
 649                         }
 650
 651                         SqlDataReader dataReader = new SqlDataReader (this);
 652                         SqlXmlTextReader textReader = new SqlXmlTextReader (dataReader);
 653                         XmlReader xmlReader = new XmlTextReader (textReader);
 654                         return xmlReader;
 655                 }
 656
 657                 internal void GetOutputParameters ()
 658                 {
 659                         IList list = Connection.Tds.OutputParameters;
 660
 661                         if (list != null && list.Count > 0) {
 662
 663                                 int index = 0;
 664                                 foreach (SqlParameter parameter in parameters) {
 665                                         if (parameter.Direction != ParameterDirection.Input &&
 666                                             parameter.Direction != ParameterDirection.ReturnValue) {
 667                                                 parameter.Value = list [index];
 668                                                 index += 1;
 669                                         }
 670                                         if (index >= list.Count)
 671                                                 break;
 672                                 }
 673                         }
 674                 }
 675
 676                 object ICloneable.Clone ()
 677                 {
 678                         return new SqlCommand (commandText, connection, transaction, commandType, updatedRowSource, designTimeVisible, commandTimeout, parameters);
 679
 680                 }
 681
 682 #if !NET_2_0
 683                 IDbDataParameter IDbCommand.CreateParameter ()
 684                 {
 685                         return CreateParameter ();
 686                 }
 687
 688                 IDataReader IDbCommand.ExecuteReader ()
 689                 {
 690                         return ExecuteReader ();
 691                 }
 692
 693                 IDataReader IDbCommand.ExecuteReader (CommandBehavior behavior)
 694                 {
 695                         return ExecuteReader (behavior);
 696                 }
 697 #endif
 698
 699 #if NET_2_0
 700                 protected override void Dispose (bool disposing)
 701                 {
 702                         if (disposed) return;
 703                         if (disposing) {
 704                                 parameters.Clear();
 705                         }
 706                         base.Dispose (disposing);
 707                         disposed = true;
 708                 }
 709 #endif
 710
 711                 public
 712 #if NET_2_0
 713                 override
 714 #endif // NET_2_0
 715                 void Prepare ()
 716                 {
 717 #if NET_2_0
 718                         if (Connection == null)
 719                                 throw new NullReferenceException ();
 720 #endif
 721
 722                         if (CommandType == CommandType.StoredProcedure || CommandType == CommandType.Text && Parameters.Count == 0)
 723                                 return;
 724
 725                         ValidateCommand ("Prepare", false);
 726
 727                         try {
 728                                 foreach (SqlParameter param in Parameters)
 729                                         param.CheckIfInitialized ();
 730                         } catch (Exception e) {
 731                                 throw new InvalidOperationException ("SqlCommand.Prepare requires " + e.Message);
 732                         }
 733
 734                         preparedStatement = Connection.Tds.Prepare (CommandText, Parameters.MetaParameters);
 735                 }
 736
 737                 public void ResetCommandTimeout ()
 738                 {
 739                         commandTimeout = DEFAULT_COMMAND_TIMEOUT;
 740                 }
 741
 742                 private void Unprepare ()
 743                 {
 744                         Connection.Tds.Unprepare (preparedStatement);
 745                         preparedStatement = null;
 746                 }
 747
 748                 private void ValidateCommand (string method, bool async)
 749                 {
 750                         if (Connection == null)
 751                                 throw new InvalidOperationException (String.Format ("{0}: A Connection object is required to continue.", method));
 752                         if (Transaction == null && Connection.Transaction != null)
 753                                 throw new InvalidOperationException (String.Format (
 754                                         "{0} requires a transaction if the command's connection is in a pending transaction.",
 755 #if NET_2_0
 756                                         method));
 757 #else
 758                                         "Execute"));
 759 #endif
 760                         if (Transaction != null && Transaction.Connection != Connection)
 761                                 throw new InvalidOperationException ("The connection does not have the same transaction as the command.");
 762                         if (Connection.State != ConnectionState.Open)
 763                                 throw new InvalidOperationException (String.Format ("{0} requires an open connection to continue. This connection is closed.", method));
 764                         if (CommandText.Length == 0)
 765                                 throw new InvalidOperationException (String.Format ("{0}: CommandText has not been set for this Command.", method));
 766                         if (Connection.DataReader != null)
 767                                 throw new InvalidOperationException ("There is already an open DataReader associated with this Connection which must be closed first.");
 768                         if (Connection.XmlReader != null)
 769                                 throw new InvalidOperationException ("There is already an open XmlReader associated with this Connection which must be closed first.");
 770 #if NET_2_0
 771                         if (async && !Connection.AsyncProcessing)
 772                                 throw new InvalidOperationException ("This Connection object is not " +
 773                                         "in Asynchronous mode. Use 'Asynchronous" +
 774                                         " Processing = true' to set it.");
 775 #endif // NET_2_0
 776                 }
 777
 778 #if NET_2_0
 779                 protected override DbParameter CreateDbParameter ()
 780                 {
 781                         return CreateParameter ();
 782                 }
 783
 784                 protected override DbDataReader ExecuteDbDataReader (CommandBehavior behavior)
 785                 {
 786                         return ExecuteReader (behavior);
 787                 }
 788
 789                 protected override DbConnection DbConnection {
 790                         get { return Connection; }
 791                         set { Connection = (SqlConnection) value; }
 792                 }
 793
 794                 protected override DbParameterCollection DbParameterCollection {
 795                         get { return Parameters; }
 796                 }
 797
 798                 protected override DbTransaction DbTransaction {
 799                         get { return Transaction; }
 800                         set { Transaction = (SqlTransaction) value; }
 801                 }
 802 #endif // NET_2_0
 803
 804                 #endregion // Methods
 805
 806 #if NET_2_0
 807                 #region Asynchronous Methods
 808
 809                 internal IAsyncResult BeginExecuteInternal (CommandBehavior behavior,
 810                                                                                                         bool wantResults,
 811                                                                                                         AsyncCallback callback,
 812                                                                                                         object state)
 813                 {
 814                         IAsyncResult ar = null;
 815                         Connection.Tds.RecordsAffected = -1;
 816                         TdsMetaParameterCollection parms = Parameters.MetaParameters;
 817                         if (preparedStatement == null) {
 818                                 bool schemaOnly = ((behavior & CommandBehavior.SchemaOnly) > 0);
 819                                 bool keyInfo = ((behavior & CommandBehavior.KeyInfo) > 0);
 820
 821                                 StringBuilder sql1 = new StringBuilder ();
 822                                 StringBuilder sql2 = new StringBuilder ();
 823
 824                                 if (schemaOnly || keyInfo)
 825                                         sql1.Append ("SET FMTONLY OFF;");
 826                                 if (keyInfo) {
 827                                         sql1.Append ("SET NO_BROWSETABLE ON;");
 828                                         sql2.Append ("SET NO_BROWSETABLE OFF;");
 829                                 }
 830                                 if (schemaOnly) {
 831                                         sql1.Append ("SET FMTONLY ON;");
 832                                         sql2.Append ("SET FMTONLY OFF;");
 833                                 }
 834                                 switch (CommandType) {
 835                                 case CommandType.StoredProcedure:
 836                                         string prolog = "";
 837                                         string epilog = "";
 838                                         if (keyInfo || schemaOnly)
 839                                                 prolog = sql1.ToString ();
 840                                         if (keyInfo || schemaOnly)
 841                                                 epilog = sql2.ToString ();
 842                                         try {
 843                                                 Connection.Tds.BeginExecuteProcedure (prolog,
 844                                                                                       epilog,
 845                                                                                       CommandText,
 846                                                                                       !wantResults,
 847                                                                                       parms,
 848                                                                                       callback,
 849                                                                                       state);
 850                                         } catch (TdsTimeoutException ex) {
 851                                                 Connection.Tds.Reset ();
 852                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 853                                         } catch (TdsInternalException ex) {
 854                                                 Connection.Close ();
 855                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 856                                         }
 857                                         break;
 858                                 case CommandType.Text:
 859                                         string sql = String.Format ("{0}{1};{2}", sql1.ToString (), CommandText, sql2.ToString ());
 860                                         try {
 861                                                 if (wantResults)
 862                                                         ar = Connection.Tds.BeginExecuteQuery (sql, parms, callback, state);
 863                                                 else
 864                                                         ar = Connection.Tds.BeginExecuteNonQuery (sql, parms, callback, state);
 865                                         } catch (TdsTimeoutException ex) {
 866                                                 Connection.Tds.Reset ();
 867                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 868                                         } catch (TdsInternalException ex) {
 869                                                 Connection.Close ();
 870                                                 throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 871                                         }
 872                                         break;
 873                                 }
 874                         }
 875                         else {
 876                                 try {
 877                                         Connection.Tds.ExecPrepared (preparedStatement, parms, CommandTimeout, wantResults);
 878                                 } catch (TdsTimeoutException ex) {
 879                                         Connection.Tds.Reset ();
 880                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 881                                 } catch (TdsInternalException ex) {
 882                                         Connection.Close ();
 883                                         throw SqlException.FromTdsInternalException ((TdsInternalException) ex);
 884                                 }
 885                         }
 886                         return ar;
 887                 }
 888
 889                 internal void EndExecuteInternal (IAsyncResult ar)
 890                 {
 891                         SqlAsyncResult sqlResult = ( (SqlAsyncResult) ar);
 892                         Connection.Tds.WaitFor (sqlResult.InternalResult);
 893                         Connection.Tds.CheckAndThrowException (sqlResult.InternalResult);
 894                 }
 895
 896                 public IAsyncResult BeginExecuteNonQuery ()
 897                 {
 898                         return BeginExecuteNonQuery (null, null);
 899                 }
 900
 901                 public IAsyncResult BeginExecuteNonQuery (AsyncCallback callback, object stateObject)
 902                 {
 903                         ValidateCommand ("BeginExecuteNonQuery", true);
 904                         SqlAsyncResult ar = new SqlAsyncResult (callback, stateObject);
 905                         ar.EndMethod = "EndExecuteNonQuery";
 906                         ar.InternalResult = BeginExecuteInternal (CommandBehavior.Default, false, ar.BubbleCallback, ar);
 907                         return ar;
 908                 }
 909
 910                 public int EndExecuteNonQuery (IAsyncResult asyncResult)
 911                 {
 912                         ValidateAsyncResult (asyncResult, "EndExecuteNonQuery");
 913                         EndExecuteInternal (asyncResult);
 914
 915                         int ret = Connection.Tds.RecordsAffected;
 916
 917                         GetOutputParameters ();
 918                         ((SqlAsyncResult) asyncResult).Ended = true;
 919                         return ret;
 920                 }
 921
 922                 public IAsyncResult BeginExecuteReader ()
 923                 {
 924                         return BeginExecuteReader (null, null, CommandBehavior.Default);
 925                 }
 926
 927                 public IAsyncResult BeginExecuteReader (CommandBehavior behavior)
 928                 {
 929                         return BeginExecuteReader (null, null, behavior);
 930                 }
 931
 932                 public IAsyncResult BeginExecuteReader (AsyncCallback callback, object stateObject)
 933                 {
 934                         return BeginExecuteReader (callback, stateObject, CommandBehavior.Default);
 935                 }
 936
 937                 public IAsyncResult BeginExecuteReader (AsyncCallback callback, object stateObject, CommandBehavior behavior)
 938                 {
 939                         ValidateCommand ("BeginExecuteReader", true);
 940                         this.behavior = behavior;
 941                         SqlAsyncResult ar = new SqlAsyncResult (callback, stateObject);
 942                         ar.EndMethod = "EndExecuteReader";
 943                         IAsyncResult tdsResult = BeginExecuteInternal (behavior, true,
 944                                 ar.BubbleCallback, stateObject);
 945                         ar.InternalResult = tdsResult;
 946                         return ar;
 947                 }
 948
 949                 public SqlDataReader EndExecuteReader (IAsyncResult asyncResult)
 950                 {
 951                         ValidateAsyncResult (asyncResult, "EndExecuteReader");
 952                         EndExecuteInternal (asyncResult);
 953                         SqlDataReader reader = null;
 954                         try {
 955                                 reader = new SqlDataReader (this);
 956                         } catch (TdsTimeoutException e) {
 957                                 throw SqlException.FromTdsInternalException ((TdsInternalException) e);
 958                         } catch (TdsInternalException e) {
 959                                 // if behavior is closeconnection, even if it throws exception
 960                                 // the connection has to be closed.
 961                                 if ((behavior & CommandBehavior.CloseConnection) != 0)
 962                                         Connection.Close ();
 963                                 throw SqlException.FromTdsInternalException ((TdsInternalException) e);
 964                         }
 965
 966                         ((SqlAsyncResult) asyncResult).Ended = true;
 967                         return reader;
 968                 }
 969
 970                 public IAsyncResult BeginExecuteXmlReader (AsyncCallback callback, object stateObject)
 971                 {
 972                         ValidateCommand ("BeginExecuteXmlReader", true);
 973                         SqlAsyncResult ar = new SqlAsyncResult (callback, stateObject);
 974                         ar.EndMethod = "EndExecuteXmlReader";
 975                         ar.InternalResult = BeginExecuteInternal (behavior, true,
 976                                 ar.BubbleCallback, stateObject);
 977                         return ar;
 978                 }
 979
 980                 public IAsyncResult BeginExecuteXmlReader ()
 981                 {
 982                         return BeginExecuteXmlReader (null, null);
 983                 }
 984
 985
 986                 public XmlReader EndExecuteXmlReader (IAsyncResult asyncResult)
 987                 {
 988                         ValidateAsyncResult (asyncResult, "EndExecuteXmlReader");
 989                         EndExecuteInternal (asyncResult);
 990                         SqlDataReader reader = new SqlDataReader (this);
 991                         SqlXmlTextReader textReader = new SqlXmlTextReader (reader);
 992                         XmlReader xmlReader = new XmlTextReader (textReader);
 993                         ((SqlAsyncResult) asyncResult).Ended = true;
 994                         return xmlReader;
 995                 }
 996
 997                 internal void ValidateAsyncResult (IAsyncResult ar, string endMethod)
 998                 {
 999                         if (ar == null)
1000                                 throw new ArgumentException ("result passed is null!");
1001                         if (! (ar is SqlAsyncResult))
1002                                 throw new ArgumentException (String.Format ("cannot test validity of types {0}",
1003                                         ar.GetType ()));
1004                         SqlAsyncResult result = (SqlAsyncResult) ar;
1005                         if (result.EndMethod != endMethod)
1006                                 throw new InvalidOperationException (String.Format ("Mismatched {0} called for AsyncResult. " +
1007                                         "Expected call to {1} but {0} is called instead.",
1008                                         endMethod, result.EndMethod));
1009                         if (result.Ended)
1010                                 throw new InvalidOperationException (String.Format ("The method {0} cannot be called " +
1011                                         "more than once for the same AsyncResult.", endMethod));
1012                 }
1013
1014                 #endregion // Asynchronous Methods
1015
1016                 public event StatementCompletedEventHandler StatementCompleted;
1017 #endif // NET_2_0
1018         }
1019 }