mcs/class/Mono.Data.Tds/Mono.Data.Tds.Protocol/Tds70.cs

   1 //
   2 // Mono.Data.Tds.Protocol.Tds70.cs
   3 //
   4 // Author:
   5 //   Tim Coleman (tim@timcoleman.com)
   6 //   Diego Caravana (diego@toth.it)
   7 //   Sebastien Pouliot (sebastien@ximian.com)
   8 //   Daniel Morgan (danielmorgan@verizon.net)
   9 //   Gert Driesen (drieseng@users.sourceforge.net)
  10 //   Veerapuram Varadhan  (vvaradhan@novell.com)
  11 //
  12 // Copyright (C) 2002 Tim Coleman
  13 // Portions (C) 2003 Motus Technologies Inc. (http://www.motus.com)
  14 // Portions (C) 2003 Daniel Morgan
  15 //
  16 //
  17 // Permission is hereby granted, free of charge, to any person obtaining
  18 // a copy of this software and associated documentation files (the
  19 // "Software"), to deal in the Software without restriction, including
  20 // without limitation the rights to use, copy, modify, merge, publish,
  21 // distribute, sublicense, and/or sell copies of the Software, and to
  22 // permit persons to whom the Software is furnished to do so, subject to
  23 // the following conditions:
  24 //
  25 // The above copyright notice and this permission notice shall be
  26 // included in all copies or substantial portions of the Software.
  27 //
  28 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  32 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  33 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  34 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  35 //
  36
  37 using System;
  38 using System.Globalization;
  39 using System.Text;
  40
  41 using Mono.Security.Protocol.Ntlm;
  42
  43 namespace Mono.Data.Tds.Protocol
  44 {
  45         public class Tds70 : Tds
  46         {
  47                 #region Fields
  48
  49                 //public readonly static TdsVersion Version = TdsVersion.tds70;
  50                 static readonly decimal SMALLMONEY_MIN = -214748.3648m;
  51                 static readonly decimal SMALLMONEY_MAX = 214748.3647m;
  52
  53                 #endregion // Fields
  54
  55                 #region Constructors
  56
  57                 public Tds70 (string server, int port)
  58                         : this (server, port, 512, 15)
  59                 {
  60                 }
  61
  62                 public Tds70 (string server, int port, int packetSize, int timeout)
  63                         : base (server, port, packetSize, timeout, TdsVersion.tds70)
  64                 {
  65                 }
  66
  67                 public Tds70 (string server, int port, int packetSize, int timeout, TdsVersion version)
  68                         : base (server, port, packetSize, timeout, version)
  69                 {
  70                 }
  71
  72                 #endregion // Constructors
  73
  74                 #region Properties
  75
  76                 protected virtual byte[] ClientVersion {
  77                         get { return new byte[] {0x00, 0x0, 0x0, 0x70};}
  78                 }
  79                 #endregion // Properties
  80
  81                 #region Methods
  82
  83                 private string BuildExec (string sql)
  84                 {
  85                         string esql = sql.Replace ("'", "''"); // escape single quote
  86                         if (Parameters != null && Parameters.Count > 0)
  87                                 return BuildProcedureCall (String.Format ("sp_executesql N'{0}', N'{1}', ", esql, BuildPreparedParameters ()));
  88                         else
  89                                 return BuildProcedureCall (String.Format ("sp_executesql N'{0}'", esql));
  90                 }
  91
  92                 private string BuildParameters ()
  93                 {
  94                         if (Parameters == null || Parameters.Count == 0)
  95                                 return String.Empty;
  96
  97                         StringBuilder result = new StringBuilder ();
  98                         foreach (TdsMetaParameter p in Parameters) {
  99                                 string parameterName = p.ParameterName;
 100                                 if (parameterName [0] == '@') {
 101                                         parameterName = parameterName.Substring (1);
 102                                 }
 103                                 if (p.Direction != TdsParameterDirection.ReturnValue) {
 104                                         if (result.Length > 0)
 105                                                 result.Append (", ");
 106                                         if (p.Direction == TdsParameterDirection.InputOutput)
 107                                                 result.AppendFormat ("@{0}={0} output", parameterName);
 108                                         else
 109                                                 result.Append (FormatParameter (p));
 110                                 }
 111                         }
 112                         return result.ToString ();
 113                 }
 114
 115                 private string BuildPreparedParameters ()
 116                 {
 117                         StringBuilder parms = new StringBuilder ();
 118                         foreach (TdsMetaParameter p in Parameters) {
 119                                 if (parms.Length > 0)
 120                                         parms.Append (", ");
 121                                 parms.Append (p.Prepare ());
 122                                 if (p.Direction == TdsParameterDirection.Output)
 123                                         parms.Append (" output");
 124                         }
 125                         return parms.ToString ();
 126                 }
 127
 128                 private string BuildPreparedQuery (string id)
 129                 {
 130                         return BuildProcedureCall (String.Format ("sp_execute {0},", id));
 131                 }
 132
 133                 private string BuildProcedureCall (string procedure)
 134                 {
 135                         string exec = String.Empty;
 136
 137                         StringBuilder declare = new StringBuilder ();
 138                         StringBuilder select = new StringBuilder ();
 139                         StringBuilder set = new StringBuilder ();
 140
 141                         int count = 0;
 142                         if (Parameters != null) {
 143                                 foreach (TdsMetaParameter p in Parameters) {
 144                                         string parameterName = p.ParameterName;
 145                                         if (parameterName [0] == '@') {
 146                                                 parameterName = parameterName.Substring (1);
 147                                         }
 148
 149                                         if (p.Direction != TdsParameterDirection.Input) {
 150                                                 if (count == 0)
 151                                                         select.Append ("select ");
 152                                                 else
 153                                                         select.Append (", ");
 154                                                 select.Append ("@" + parameterName);
 155
 156                                                 declare.Append (String.Format ("declare {0}\n", p.Prepare ()));
 157
 158                                                 if (p.Direction != TdsParameterDirection.ReturnValue) {
 159                                                         if (p.Direction == TdsParameterDirection.InputOutput)
 160                                                                 set.Append (String.Format ("set {0}\n", FormatParameter(p)));
 161                                                         else
 162                                                                 set.Append (String.Format ("set @{0}=NULL\n", parameterName));
 163                                                 }
 164
 165                                                 count++;
 166                                         }
 167                                         if (p.Direction == TdsParameterDirection.ReturnValue)
 168                                                 exec = "@" + parameterName + "=";
 169                                 }
 170                         }
 171                         exec = "exec " + exec;
 172
 173                         return String.Format ("{0}{1}{2}{3} {4}\n{5}",
 174                                 declare.ToString (), set.ToString (), exec,
 175                                 procedure, BuildParameters (), select.ToString ());
 176                 }
 177
 178                 public override bool Connect (TdsConnectionParameters connectionParameters)
 179                 {
 180                         if (IsConnected)
 181                                 throw new InvalidOperationException ("The connection is already open.");
 182
 183                         connectionParms = connectionParameters;
 184
 185                         SetLanguage (connectionParameters.Language);
 186                         SetCharset ("utf-8");
 187
 188                         byte[] empty = new byte[0];
 189                         short authLen = 0;
 190                         byte pad = (byte) 0;
 191
 192                         byte[] domainMagic = { 6, 0x7d, 0x0f, 0xfd, 0xff, 0x0, 0x0, 0x0,
 193                                                                         0x0, 0xe0, 0x83, 0x0, 0x0,
 194                                                                         0x68, 0x01, 0x00, 0x00, 0x09, 0x04, 0x00, 0x00 };
 195                         byte[] sqlserverMagic = { 6, 0x0, 0x0, 0x0,
 196                                                                                 0x0, 0x0, 0x0, 0x0,
 197                                                                                 0x0, 0xe0, 0x03, 0x0,
 198                                                                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 199                                                                                 0x0, 0x0, 0x0 };
 200                         byte[] magic = null;
 201
 202                         if (connectionParameters.DomainLogin)
 203                                 magic = domainMagic;
 204                         else
 205                                 magic = sqlserverMagic;
 206
 207                         string username = connectionParameters.User;
 208                         string domain = null;
 209
 210                         int idx = username.IndexOf ("\\");
 211                         if (idx != -1) {
 212                                 domain = username.Substring (0, idx);
 213                                 username = username.Substring (idx + 1);
 214
 215                                 connectionParameters.DefaultDomain = domain;
 216                                 connectionParameters.User = username;
 217                         } else {
 218                                 domain = Environment.UserDomainName;
 219                                 connectionParameters.DefaultDomain = domain;
 220                         }
 221
 222                         short partialPacketSize = (short) (86 + (
 223                                 connectionParameters.Hostname.Length +
 224                                 connectionParameters.ApplicationName.Length +
 225                                 DataSource.Length +
 226                                 connectionParameters.LibraryName.Length +
 227                                 Language.Length +
 228                                 connectionParameters.Database.Length +
 229                                 connectionParameters.AttachDBFileName.Length) * 2);
 230
 231                         if (connectionParameters.DomainLogin) {
 232                                 authLen = ((short) (32 + (connectionParameters.Hostname.Length +
 233                                         domain.Length)));
 234                                 partialPacketSize += authLen;
 235                         } else
 236                                 partialPacketSize += ((short) ((username.Length + connectionParameters.Password.Length) * 2));
 237
 238                         int totalPacketSize = partialPacketSize;
 239
 240                         Comm.StartPacket (TdsPacketType.Logon70);
 241
 242                         Comm.Append (totalPacketSize);
 243
 244                         //Comm.Append (empty, 3, pad);
 245                         //byte[] version = {0x00, 0x0, 0x0, 0x71};
 246                         //Console.WriteLine ("Version: {0}", ClientVersion[3]);
 247                         Comm.Append (ClientVersion); // TDS Version 7
 248                         Comm.Append ((int)this.PacketSize); // Set the Block Size
 249                         Comm.Append (empty, 3, pad);
 250                         Comm.Append (magic);
 251
 252                         short curPos = 86;
 253
 254                         // Hostname
 255                         Comm.Append (curPos);
 256                         Comm.Append ((short) connectionParameters.Hostname.Length);
 257                         curPos += (short) (connectionParameters.Hostname.Length * 2);
 258
 259                         if (connectionParameters.DomainLogin) {
 260                                 Comm.Append((short)0);
 261                                 Comm.Append((short)0);
 262                                 Comm.Append((short)0);
 263                                 Comm.Append((short)0);
 264                         } else {
 265                                 // Username
 266                                 Comm.Append (curPos);
 267                                 Comm.Append ((short) username.Length);
 268                                 curPos += ((short) (username.Length * 2));
 269
 270                                 // Password
 271                                 Comm.Append (curPos);
 272                                 Comm.Append ((short) connectionParameters.Password.Length);
 273                                 curPos += (short) (connectionParameters.Password.Length * 2);
 274                         }
 275
 276                         // AppName
 277                         Comm.Append (curPos);
 278                         Comm.Append ((short) connectionParameters.ApplicationName.Length);
 279                         curPos += (short) (connectionParameters.ApplicationName.Length * 2);
 280
 281                         // Server Name
 282                         Comm.Append (curPos);
 283                         Comm.Append ((short) DataSource.Length);
 284                         curPos += (short) (DataSource.Length * 2);
 285
 286                         // Unknown
 287                         Comm.Append ((short) curPos);
 288                         Comm.Append ((short) 0);
 289
 290                         // Library Name
 291                         Comm.Append (curPos);
 292                         Comm.Append ((short) connectionParameters.LibraryName.Length);
 293                         curPos += (short) (connectionParameters.LibraryName.Length * 2);
 294
 295                         // Language
 296                         Comm.Append (curPos);
 297                         Comm.Append ((short) Language.Length);
 298                         curPos += (short) (Language.Length * 2);
 299
 300                         // Database
 301                         Comm.Append (curPos);
 302                         Comm.Append ((short) connectionParameters.Database.Length);
 303                         curPos += (short) (connectionParameters.Database.Length * 2);
 304
 305                         // MAC Address
 306                         Comm.Append((byte) 0);
 307                         Comm.Append((byte) 0);
 308                         Comm.Append((byte) 0);
 309                         Comm.Append((byte) 0);
 310                         Comm.Append((byte) 0);
 311                         Comm.Append((byte) 0);
 312
 313                         // Authentication Stuff
 314                         Comm.Append ((short) curPos);
 315                         if (connectionParameters.DomainLogin) {
 316                                 Comm.Append ((short) authLen);
 317                                 curPos += (short) authLen;
 318                         } else
 319                                 Comm.Append ((short) 0);
 320
 321                         // Unknown
 322                         Comm.Append (curPos);
 323                         Comm.Append ((short)( connectionParameters.AttachDBFileName.Length));
 324                         curPos += (short)(connectionParameters.AttachDBFileName.Length*2);
 325
 326                         // Connection Parameters
 327                         Comm.Append (connectionParameters.Hostname);
 328                         if (!connectionParameters.DomainLogin) {
 329                                 // SQL Server Authentication
 330                                 Comm.Append (connectionParameters.User);
 331                                 string scrambledPwd = EncryptPassword (connectionParameters.Password);
 332                                 Comm.Append (scrambledPwd);
 333                         }
 334                         Comm.Append (connectionParameters.ApplicationName);
 335                         Comm.Append (DataSource);
 336                         Comm.Append (connectionParameters.LibraryName);
 337                         Comm.Append (Language);
 338                         Comm.Append (connectionParameters.Database);
 339
 340                         if (connectionParameters.DomainLogin) {
 341                                 // the rest of the packet is NTLMSSP authentication
 342                                 Type1Message msg = new Type1Message ();
 343                                 msg.Domain = domain;
 344                                 msg.Host = connectionParameters.Hostname;
 345                                 msg.Flags = NtlmFlags.NegotiateUnicode |
 346                                         NtlmFlags.NegotiateNtlm |
 347                                         NtlmFlags.NegotiateDomainSupplied |
 348                                         NtlmFlags.NegotiateWorkstationSupplied |
 349                                         NtlmFlags.NegotiateAlwaysSign; // 0xb201
 350                                 Comm.Append (msg.GetBytes ());
 351                         }
 352
 353                         Comm.Append (connectionParameters.AttachDBFileName);
 354                         Comm.SendPacket ();
 355                         MoreResults = true;
 356                         SkipToEnd ();
 357
 358                         return IsConnected;
 359                 }
 360
 361                 private static string EncryptPassword (string pass)
 362                 {
 363                         int xormask = 0x5a5a;
 364                         int len = pass.Length;
 365                         char[] chars = new char[len];
 366
 367                         for (int i = 0; i < len; ++i) {
 368                                 int c = ((int) (pass[i])) ^ xormask;
 369                                 int m1 = (c >> 4) & 0x0f0f;
 370                                 int m2 = (c << 4) & 0xf0f0;
 371                                 chars[i] = (char) (m1 | m2);
 372                         }
 373
 374                         return new String (chars);
 375                 }
 376
 377                 public override bool Reset ()
 378                 {
 379                         // Check validity of the connection - a false removes
 380                         // the connection from the pool
 381                         // NOTE: MS implementation will throw a connection-reset error as it will
 382                         // try to use the same connection
 383                         if (!Comm.IsConnected ())
 384                                 return false;
 385
 386                         // Set "reset-connection" bit for the next message packet
 387                         Comm.ResetConnection = true;
 388                         base.Reset ();
 389                         return true;
 390                 }
 391
 392                 public override void ExecPrepared (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 393                 {
 394                         Parameters = parameters;
 395                         if (Parameters != null && Parameters.Count > 0)
 396                                 ExecRPC (TdsRpcProcId.ExecuteSql, commandText, parameters, timeout, wantResults);
 397                         else
 398                                 ExecuteQuery (BuildPreparedQuery (commandText), timeout, wantResults);
 399                 }
 400
 401                 public override void ExecProc (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 402                 {
 403                         Parameters = parameters;
 404                         ExecRPC (commandText, parameters, timeout, wantResults);
 405                 }
 406
 407                 private void WriteRpcParameterInfo (TdsMetaParameterCollection parameters)
 408                 {
 409                         if (parameters != null) {
 410                                 foreach (TdsMetaParameter param in parameters) {
 411                                         if (param.Direction == TdsParameterDirection.ReturnValue)
 412                                                 continue;
 413                                         string pname = param.ParameterName;
 414                                         if (pname != null && pname.Length > 0 && pname [0] == '@') {
 415                                                 Comm.Append ( (byte) pname.Length);
 416                                                 Comm.Append (pname);
 417                                         } else {
 418                                                 Comm.Append ( (byte) (pname.Length + 1));
 419                                                 Comm.Append ("@" + pname);
 420                                         }
 421                                         short status = 0; // unused
 422                                         if (param.Direction != TdsParameterDirection.Input)
 423                                                 status |= 0x01; // output
 424                                         Comm.Append ( (byte) status);
 425                                         WriteParameterInfo (param);
 426                                 }
 427                         }
 428                 }
 429
 430                 private void WritePreparedParameterInfo (TdsMetaParameterCollection parameters)
 431                 {
 432                         if (parameters == null)
 433                                 return;
 434
 435                         string param = BuildPreparedParameters ();
 436                         Comm.Append ((byte) 0x00); // no param meta data name
 437                         Comm.Append ((byte) 0x00); // no status flags
 438
 439                         // Type_info - parameter info
 440                         WriteParameterInfo (new TdsMetaParameter ("prep_params",
 441                                                                   param.Length > 4000 ? "ntext" : "nvarchar",
 442                                                                   param));
 443                 }
 444
 445                 private void ExecRPC (TdsRpcProcId rpcId, string sql,
 446                                       TdsMetaParameterCollection parameters,
 447                                       int timeout, bool wantResults)
 448                 {
 449                         // clean up
 450                         InitExec ();
 451                         Comm.StartPacket (TdsPacketType.RPC);
 452
 453                         Comm.Append ((ushort) 0xFFFF);
 454                         Comm.Append ((ushort) rpcId);
 455                         Comm.Append ((short) 0x02); // no meta data
 456
 457                         Comm.Append ((byte) 0x00); // no param meta data name
 458                         Comm.Append ((byte) 0x00); // no status flags
 459
 460                         // Write sql as a parameter value - UCS2
 461                         TdsMetaParameter param = new TdsMetaParameter ("sql",
 462                                                                        sql.Length > 4000 ? "ntext":"nvarchar",
 463                                                                        sql);
 464                         WriteParameterInfo (param);
 465
 466                         // Write Parameter infos - name and type
 467                         WritePreparedParameterInfo (parameters);
 468
 469                         // Write parameter/value info
 470                         WriteRpcParameterInfo (parameters);
 471                         Comm.SendPacket ();
 472                         CheckForData (timeout);
 473                         if (!wantResults)
 474                                 SkipToEnd ();
 475                 }
 476
 477                 protected override void ExecRPC (string rpcName, TdsMetaParameterCollection parameters,
 478                                                  int timeout, bool wantResults)
 479                 {
 480                         // clean up
 481                         InitExec ();
 482                         Comm.StartPacket (TdsPacketType.RPC);
 483
 484                         Comm.Append ( (short) rpcName.Length);
 485                         Comm.Append (rpcName);
 486                         Comm.Append ( (short) 0); //no meta data
 487                         WriteRpcParameterInfo (parameters);
 488                         Comm.SendPacket ();
 489                         CheckForData (timeout);
 490                         if (!wantResults)
 491                                 SkipToEnd ();
 492                 }
 493
 494                 private void WriteParameterInfo (TdsMetaParameter param)
 495                 {
 496                         /*
 497                         Ms.net send non-nullable datatypes as nullable and allows setting null values
 498                         to int/float etc.. So, using Nullable form of type for all data
 499                         */
 500                         param.IsNullable = true;
 501                         TdsColumnType colType = param.GetMetaType ();
 502                         param.IsNullable = false;
 503
 504                         bool partLenType = false;
 505                         int size = param.Size;
 506                         if (size < 1) {
 507                                 if (size < 0)
 508                                         partLenType = true;
 509                                 size = param.GetActualSize ();
 510                         }
 511
 512                         // Change colType according to the following table
 513                         /*
 514                          * Original Type        Maxlen          New Type
 515                          *
 516                          * NVarChar             4000 UCS2       NText
 517                          * BigVarChar           8000 ASCII      Text
 518                          * BigVarBinary         8000 bytes      Image
 519                          *
 520                          */
 521                         TdsColumnType origColType = colType;
 522                         if (colType == TdsColumnType.BigNVarChar) {
 523                                 // param.GetActualSize() returns len*2
 524                                 if (size == param.Size)
 525                                         size <<= 1;
 526                                 if ((size >> 1) > 4000)
 527                                         colType = TdsColumnType.NText;
 528                         } else if (colType == TdsColumnType.BigVarChar) {
 529                                 if (size > 8000)
 530                                         colType = TdsColumnType.Text;
 531                         } else if (colType == TdsColumnType.BigVarBinary) {
 532                                 if (size > 8000)
 533                                         colType = TdsColumnType.Image;
 534                         }
 535                         // Calculation of TypeInfo field
 536                         /*
 537                          * orig size value              TypeInfo field
 538                          *
 539                          * >= 0 <= Maxlen               origColType + content len
 540                          * > Maxlen             NewType as per above table + content len
 541                          * -1           origColType + USHORTMAXLEN (0xFFFF) + content len (TDS 9)
 542                          *
 543                          */
 544                         // Write updated colType, iff partLenType == false
 545                         if (TdsVersion > TdsVersion.tds81 && partLenType) {
 546                                 Comm.Append ((byte)origColType);
 547                                 Comm.Append ((short)-1);
 548                         } else if (ServerTdsVersion > TdsVersion.tds70
 549                                    && origColType == TdsColumnType.Decimal) {
 550                                 Comm.Append ((byte)TdsColumnType.Numeric);
 551                         } else {
 552                                 Comm.Append ((byte)colType);
 553                         }
 554
 555                         if (IsLargeType (colType))
 556                                 Comm.Append ((short)size); // Parameter size passed in SqlParameter
 557                         else if (IsBlobType (colType))
 558                                 Comm.Append (size); // Parameter size passed in SqlParameter
 559                         else
 560                                 Comm.Append ((byte)size);
 561
 562                         // Precision and Scale are non-zero for only decimal/numeric
 563                         if ( param.TypeName == "decimal" || param.TypeName == "numeric") {
 564                                 Comm.Append ((param.Precision !=0 ) ? param.Precision : (byte) 29);
 565                                 Comm.Append (param.Scale);
 566                                 // Convert the decimal value according to Scale
 567                                 if (param.Value != null && param.Value != DBNull.Value &&
 568                                     ((decimal)param.Value) != Decimal.MaxValue &&
 569                                     ((decimal)param.Value) != Decimal.MinValue) {
 570                                         decimal expo = new Decimal (System.Math.Pow (10, (double)param.Scale));
 571                                         int pVal = (int)(((decimal)param.Value) * expo);
 572                                         param.Value = (decimal)pVal;
 573                                 }
 574                         }
 575
 576
 577                         /* VARADHAN: TDS 8 Debugging */
 578                         /*
 579                         if (Collation != null) {
 580                                 Console.WriteLine ("Collation is not null");
 581                                 Console.WriteLine ("Column Type: {0}", colType);
 582                                 Console.WriteLine ("Collation bytes: {0} {1} {2} {3} {4}", Collation[0], Collation[1], Collation[2],
 583                                                    Collation[3], Collation[4]);
 584                         } else {
 585                                 Console.WriteLine ("Collation is null");
 586                         }
 587                         */
 588
 589                         // Tds > 7.0 uses collation
 590                         if (Collation != null &&
 591                             (colType == TdsColumnType.BigChar || colType == TdsColumnType.BigNVarChar ||
 592                              colType == TdsColumnType.BigVarChar || colType == TdsColumnType.NChar ||
 593                              colType == TdsColumnType.NVarChar || colType == TdsColumnType.Text ||
 594                              colType == TdsColumnType.NText))
 595                                 Comm.Append (Collation);
 596
 597                         // LAMESPEC: size should be 0xFFFF for any bigvarchar, bignvarchar and bigvarbinary
 598                         // types if param value is NULL
 599                         if ((colType == TdsColumnType.BigVarChar ||
 600                              colType == TdsColumnType.BigNVarChar ||
 601                              colType == TdsColumnType.BigVarBinary) &&
 602                             (param.Value == null || param.Value == DBNull.Value))
 603                                 size = -1;
 604                         else
 605                                 size = param.GetActualSize ();
 606
 607                         if (IsLargeType (colType))
 608                                 Comm.Append ((short)size);
 609                         else if (IsBlobType (colType))
 610                                 Comm.Append (size);
 611                         else
 612                                 Comm.Append ((byte)size);
 613
 614                         if (size > 0) {
 615                                 switch (param.TypeName) {
 616                                 case "money" : {
 617                                         Decimal val = (decimal) param.Value;
 618                                         int[] arr = Decimal.GetBits (val);
 619
 620                                         if (val >= 0) {
 621                                                 Comm.Append (arr[1]);
 622                                                 Comm.Append (arr[0]);
 623                                         } else {
 624                                                 Comm.Append (~arr[1]);
 625                                                 Comm.Append (~arr[0] + 1);
 626                                         }
 627                                         break;
 628                                 }
 629                                 case "smallmoney": {
 630                                         Decimal val = (decimal) param.Value;
 631                                         if (val < SMALLMONEY_MIN || val > SMALLMONEY_MAX)
 632                                                 throw new OverflowException (string.Format (
 633                                                         CultureInfo.InvariantCulture,
 634                                                         "Value '{0}' is not valid for SmallMoney."
 635                                                         + "  Must be between {1:N4} and {2:N4}.",
 636 #if NET_2_0
 637                                                         val,
 638 #else
 639                                                         val.ToString (CultureInfo.CurrentCulture),
 640 #endif
 641                                                         SMALLMONEY_MIN, SMALLMONEY_MAX));
 642
 643                                         int[] arr = Decimal.GetBits (val);
 644                                         int sign = (val>0 ? 1: -1);
 645                                         Comm.Append (sign * arr[0]);
 646                                         break;
 647                                 }
 648                                 case "datetime":
 649                                         Comm.Append ((DateTime)param.Value, 8);
 650                                         break;
 651                                 case "smalldatetime":
 652                                         Comm.Append ((DateTime)param.Value, 4);
 653                                         break;
 654                                 case "varchar" :
 655                                 case "nvarchar" :
 656                                 case "char" :
 657                                 case "nchar" :
 658                                 case "text" :
 659                                 case "ntext" :
 660                                         byte [] tmp = param.GetBytes ();
 661                                         Comm.Append (tmp);
 662                                         break;
 663                                 case "uniqueidentifier" :
 664                                         Comm.Append (((Guid)param.Value).ToByteArray());
 665                                         break;
 666                                 default :
 667                                         Comm.Append (param.Value);
 668                                         break;
 669                                 }
 670                         }
 671                         return;
 672                 }
 673
 674                 public override void Execute (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 675                 {
 676                         Parameters = parameters;
 677                         string sql = commandText;
 678
 679                         if (Parameters != null && Parameters.Count > 0) {
 680                                 ExecRPC (TdsRpcProcId.ExecuteSql, commandText, parameters, timeout, wantResults);
 681                         } else {
 682                                 if (wantResults)
 683                                         sql = BuildExec (commandText);
 684                                 ExecuteQuery (sql, timeout, wantResults);
 685                         }
 686                 }
 687
 688                 private string FormatParameter (TdsMetaParameter parameter)
 689                 {
 690                         string parameterName = parameter.ParameterName;
 691                         if (parameterName [0] == '@') {
 692                                 parameterName = parameterName.Substring (1);
 693                         }
 694                         if (parameter.Direction == TdsParameterDirection.Output)
 695                                 return String.Format ("@{0}=@{0} output", parameterName);
 696                         if (parameter.Value == null || parameter.Value == DBNull.Value)
 697                                 return String.Format ("@{0}=NULL", parameterName);
 698
 699                         string value = null;
 700                         switch (parameter.TypeName) {
 701                         case "smalldatetime":
 702                         case "datetime":
 703                                 DateTime d = Convert.ToDateTime (parameter.Value);
 704                                 value = String.Format (base.Locale,
 705                                         "'{0:MMM dd yyyy hh:mm:ss.fff tt}'", d);
 706                                 break;
 707                         case "bigint":
 708                         case "decimal":
 709                         case "float":
 710                         case "int":
 711                         case "money":
 712                         case "real":
 713                         case "smallint":
 714                         case "smallmoney":
 715                         case "tinyint":
 716                                 object paramValue = parameter.Value;
 717                                 Type paramType = paramValue.GetType ();
 718                                 if (paramType.IsEnum)
 719                                         paramValue = Convert.ChangeType (paramValue,
 720                                                 Type.GetTypeCode (paramType));
 721                                 value = paramValue.ToString ();
 722                                 break;
 723                         case "nvarchar":
 724                         case "nchar":
 725                                 value = String.Format ("N'{0}'", parameter.Value.ToString ().Replace ("'", "''"));
 726                                 break;
 727                         case "uniqueidentifier":
 728                                 value = String.Format ("'{0}'", ((Guid) parameter.Value).ToString (string.Empty));
 729                                 break;
 730                         case "bit":
 731                                 if (parameter.Value.GetType () == typeof (bool))
 732                                         value = (((bool) parameter.Value) ? "0x1" : "0x0");
 733                                 else
 734                                         value = parameter.Value.ToString ();
 735                                 break;
 736                         case "image":
 737                         case "binary":
 738                         case "varbinary":
 739                                 byte[] byteArray = (byte[]) parameter.Value;
 740                                 // In 1.0 profile, BitConverter.ToString() throws ArgumentOutOfRangeException when passed a 0-length
 741                                 // array, so handle that as a special case.
 742                                 if (byteArray.Length == 0)
 743                                         value = "0x";
 744                                 else
 745                                         value = String.Format ("0x{0}", BitConverter.ToString (byteArray).Replace ("-", string.Empty).ToLower ());
 746                                 break;
 747                         default:
 748                                 value = String.Format ("'{0}'", parameter.Value.ToString ().Replace ("'", "''"));
 749                                 break;
 750                         }
 751
 752                         return "@" + parameterName + "=" + value;
 753                 }
 754
 755                 public override string Prepare (string commandText, TdsMetaParameterCollection parameters)
 756                 {
 757                         Parameters = parameters;
 758
 759                         TdsMetaParameterCollection parms = new TdsMetaParameterCollection ();
 760                         TdsMetaParameter parm = new TdsMetaParameter ("@Handle", "int", null);
 761                         parm.Direction = TdsParameterDirection.Output;
 762                         parms.Add (parm);
 763
 764                         parms.Add (new TdsMetaParameter ("@VarDecl", "nvarchar", BuildPreparedParameters ()));
 765                         parms.Add (new TdsMetaParameter ("@Query", "nvarchar", commandText));
 766
 767                         ExecProc ("sp_prepare", parms, 0, true);
 768                         SkipToEnd ();
 769                         return OutputParameters[0].ToString () ;
 770                         //if (ColumnValues == null || ColumnValues [0] == null || ColumnValues [0] == DBNull.Value)
 771                         //      throw new TdsInternalException ();
 772                         //return string.Empty;
 773                         //return ColumnValues [0].ToString ();
 774                 }
 775
 776                 protected override void ProcessColumnInfo ()
 777                 {
 778                         int numColumns = Comm.GetTdsShort ();
 779                         for (int i = 0; i < numColumns; i += 1) {
 780                                 byte[] flagData = new byte[4];
 781                                 for (int j = 0; j < 4; j += 1)
 782                                         flagData[j] = Comm.GetByte ();
 783
 784                                 bool nullable = (flagData[2] & 0x01) > 0;
 785                                 //bool caseSensitive = (flagData[2] & 0x02) > 0;
 786                                 bool writable = (flagData[2] & 0x0c) > 0;
 787                                 bool autoIncrement = (flagData[2] & 0x10) > 0;
 788                                 bool isIdentity = (flagData[2] & 0x10) > 0;
 789
 790                                 TdsColumnType columnType = (TdsColumnType) ((Comm.GetByte () & 0xff));
 791
 792                                 byte xColumnType = 0;
 793                                 if (IsLargeType (columnType)) {
 794                                         xColumnType = (byte) columnType;
 795                                         if (columnType != TdsColumnType.NChar)
 796                                                 columnType -= 128;
 797                                 }
 798
 799                                 int columnSize;
 800                                 string tableName = null;
 801
 802                                 if (IsBlobType (columnType)) {
 803                                         columnSize = Comm.GetTdsInt ();
 804                                         tableName = Comm.GetString (Comm.GetTdsShort ());
 805                                 } else if (IsFixedSizeColumn (columnType)) {
 806                                         columnSize = LookupBufferSize (columnType);
 807                                 } else if (IsLargeType ((TdsColumnType) xColumnType)) {
 808                                         columnSize = Comm.GetTdsShort ();
 809                                 } else {
 810                                         columnSize = Comm.GetByte () & 0xff;
 811                                 }
 812
 813                                 if (IsWideType ((TdsColumnType) columnType))
 814                                         columnSize /= 2;
 815
 816                                 byte precision = 0;
 817                                 byte scale = 0;
 818
 819                                 if (columnType == TdsColumnType.Decimal || columnType == TdsColumnType.Numeric) {
 820                                         precision = Comm.GetByte ();
 821                                         scale = Comm.GetByte ();
 822                                 } else {
 823                                         precision = GetPrecision (columnType, columnSize);
 824                                         scale = GetScale (columnType, columnSize);
 825                                 }
 826
 827                                 string columnName = Comm.GetString (Comm.GetByte ());
 828
 829                                 TdsDataColumn col = new TdsDataColumn ();
 830                                 Columns.Add (col);
 831 #if NET_2_0
 832                                 col.ColumnType = columnType;
 833                                 col.ColumnName = columnName;
 834                                 col.IsAutoIncrement = autoIncrement;
 835                                 col.IsIdentity = isIdentity;
 836                                 col.ColumnSize = columnSize;
 837                                 col.NumericPrecision = precision;
 838                                 col.NumericScale = scale;
 839                                 col.IsReadOnly = !writable;
 840                                 col.AllowDBNull = nullable;
 841                                 col.BaseTableName = tableName;
 842                                 col.DataTypeName = Enum.GetName (typeof (TdsColumnType), xColumnType);
 843 #else
 844                                 col ["ColumnType"] = columnType;
 845                                 col ["ColumnName"] = columnName;
 846                                 col ["IsAutoIncrement"] = autoIncrement;
 847                                 col ["IsIdentity"] = isIdentity;
 848                                 col ["ColumnSize"] = columnSize;
 849                                 col ["NumericPrecision"] = precision;
 850                                 col ["NumericScale"] = scale;
 851                                 col ["IsReadOnly"] = !writable;
 852                                 col ["AllowDBNull"] = nullable;
 853                                 col ["BaseTableName"] = tableName;
 854                                 col ["DataTypeName"] = Enum.GetName (typeof (TdsColumnType), xColumnType);
 855 #endif
 856                         }
 857                 }
 858
 859                 public override void Unprepare (string statementId)
 860                 {
 861                         TdsMetaParameterCollection parms = new TdsMetaParameterCollection ();
 862                         parms.Add (new TdsMetaParameter ("@P1", "int", Int32.Parse (statementId)));
 863                         ExecProc ("sp_unprepare", parms, 0, false);
 864                 }
 865
 866                 protected override bool IsValidRowCount (byte status, byte op)
 867                 {
 868                         if ((status & (byte)0x10) == 0 || op == (byte)0xc1)
 869                                 return false;
 870                         return true;
 871                 }
 872
 873                 protected override void ProcessReturnStatus ()
 874                 {
 875                         int result = Comm.GetTdsInt ();
 876                         if (Parameters != null) {
 877                                 foreach (TdsMetaParameter param in Parameters) {
 878                                         if (param.Direction == TdsParameterDirection.ReturnValue) {
 879                                                 param.Value = result;
 880                                                 break;
 881                                         }
 882                                 }
 883                         }
 884                 }
 885
 886                 byte GetScale (TdsColumnType type, int columnSize)
 887                 {
 888                         switch (type) {
 889                         case TdsColumnType.DateTime:
 890                                 return 0x03;
 891                         case TdsColumnType.DateTime4:
 892                                 return 0x00;
 893                         case TdsColumnType.DateTimeN:
 894                                 switch (columnSize) {
 895                                 case 4:
 896                                         return 0x00;
 897                                 case 8:
 898                                         return 0x03;
 899                                 }
 900                                 break;
 901                         default:
 902                                 return 0xff;
 903                         }
 904
 905                         throw new NotSupportedException (string.Format (
 906                                 CultureInfo.InvariantCulture,
 907                                 "Fixed scale not defined for column " +
 908                                 "type '{0}' with size {1}.", type, columnSize));
 909                 }
 910
 911                 byte GetPrecision (TdsColumnType type, int columnSize)
 912                 {
 913                         switch (type) {
 914                         case TdsColumnType.Binary:
 915                                 return 0xff;
 916                         case TdsColumnType.Bit:
 917                                 return 0xff;
 918                         case TdsColumnType.Char:
 919                                 return 0xff;
 920                         case TdsColumnType.DateTime:
 921                                 return 0x17;
 922                         case TdsColumnType.DateTime4:
 923                                 return 0x10;
 924                         case TdsColumnType.DateTimeN:
 925                                 switch (columnSize) {
 926                                 case 4:
 927                                         return 0x10;
 928                                 case 8:
 929                                         return 0x17;
 930                                 }
 931                                 break;
 932                         case TdsColumnType.Real:
 933                                 return 0x07;
 934                         case TdsColumnType.Float8:
 935                                 return 0x0f;
 936                         case TdsColumnType.FloatN:
 937                                 switch (columnSize) {
 938                                 case 4:
 939                                         return 0x07;
 940                                 case 8:
 941                                         return 0x0f;
 942                                 }
 943                                 break;
 944                         case TdsColumnType.Image:
 945                                 return 0xff;
 946                         case TdsColumnType.Int1:
 947                                 return 0x03;
 948                         case TdsColumnType.Int2:
 949                                 return 0x05;
 950                         case TdsColumnType.Int4:
 951                                 return 0x0a;
 952                         case TdsColumnType.IntN:
 953                                 switch (columnSize) {
 954                                 case 1:
 955                                         return 0x03;
 956                                 case 2:
 957                                         return 0x05;
 958                                 case 4:
 959                                         return 0x0a;
 960                                 }
 961                                 break;
 962                         case TdsColumnType.Void:
 963                                 return 0x01;
 964                         case TdsColumnType.Text:
 965                                 return 0xff;
 966                         case TdsColumnType.UniqueIdentifier:
 967                                 return 0xff;
 968                         case TdsColumnType.VarBinary:
 969                                 return 0xff;
 970                         case TdsColumnType.VarChar:
 971                                 return 0xff;
 972                         case TdsColumnType.Money:
 973                                 return 19;
 974                         case TdsColumnType.NText:
 975                                 return 0xff;
 976                         case TdsColumnType.NVarChar:
 977                                 return 0xff;
 978                         case TdsColumnType.BitN:
 979                                 return 0xff;
 980                         case TdsColumnType.MoneyN:
 981                                 switch (columnSize) {
 982                                 case 4:
 983                                         return 0x0a;
 984                                 case 8:
 985                                         return 0x13;
 986                                 }
 987                                 break;
 988                         case TdsColumnType.Money4:
 989                                 return 0x0a;
 990                         case TdsColumnType.NChar:
 991                                 return 0xff;
 992                         case TdsColumnType.BigBinary:
 993                                 return 0xff;
 994                         case TdsColumnType.BigVarBinary:
 995                                 return 0xff;
 996                         case TdsColumnType.BigVarChar:
 997                                 return 0xff;
 998                         case TdsColumnType.BigNVarChar:
 999                                 return 0xff;
1000                         case TdsColumnType.BigChar:
1001                                 return 0xff;
1002                         case TdsColumnType.SmallMoney:
1003                                 return 0x0a;
1004                         case TdsColumnType.Variant:
1005                                 return 0xff;
1006                         case TdsColumnType.BigInt:
1007                                 return 0xff;
1008                         }
1009
1010                         throw new NotSupportedException (string.Format (
1011                                 CultureInfo.InvariantCulture,
1012                                 "Fixed precision not defined for column " +
1013                                 "type '{0}' with size {1}.", type, columnSize));
1014                 }
1015
1016                 #endregion // Methods
1017
1018 #if NET_2_0
1019                 #region Asynchronous Methods
1020
1021                 public override IAsyncResult BeginExecuteNonQuery (string cmdText,
1022                                                           TdsMetaParameterCollection parameters,
1023                                                           AsyncCallback callback,
1024                                                           object state)
1025                 {
1026                         Parameters = parameters;
1027                         string sql = cmdText;
1028                         if (Parameters != null && Parameters.Count > 0)
1029                                 sql = BuildExec (cmdText);
1030
1031                         IAsyncResult ar = BeginExecuteQueryInternal (sql, false, callback, state);
1032                         return ar;
1033                 }
1034
1035                 public override void EndExecuteNonQuery (IAsyncResult ar)
1036                 {
1037                         EndExecuteQueryInternal (ar);
1038                 }
1039
1040                 public override IAsyncResult BeginExecuteQuery (string cmdText,
1041                                                                 TdsMetaParameterCollection parameters,
1042                                                                 AsyncCallback callback,
1043                                                                 object state)
1044                 {
1045                         Parameters = parameters;
1046                         string sql = cmdText;
1047                         if (Parameters != null && Parameters.Count > 0)
1048                                 sql = BuildExec (cmdText);
1049
1050                         IAsyncResult ar = BeginExecuteQueryInternal (sql, true, callback, state);
1051                         return ar;
1052                 }
1053
1054                 public override void EndExecuteQuery (IAsyncResult ar)
1055                 {
1056                         EndExecuteQueryInternal (ar);
1057                 }
1058
1059                 public override IAsyncResult BeginExecuteProcedure (string prolog,
1060                                                                     string epilog,
1061                                                                     string cmdText,
1062                                                                     bool IsNonQuery,
1063                                                                     TdsMetaParameterCollection parameters,
1064                                                                     AsyncCallback callback,
1065                                                                     object state)
1066                 {
1067                         Parameters = parameters;
1068                         string pcall = BuildProcedureCall (cmdText);
1069                         string sql = String.Format ("{0};{1};{2};", prolog, pcall, epilog);
1070
1071                         IAsyncResult ar = BeginExecuteQueryInternal (sql, !IsNonQuery, callback, state);
1072                         return ar;
1073                 }
1074
1075                 public override void EndExecuteProcedure (IAsyncResult ar)
1076                 {
1077                         EndExecuteQueryInternal (ar);
1078                 }
1079
1080                 #endregion // Asynchronous Methods
1081 #endif // NET_2_0
1082         }
1083 }