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                 [Obsolete ("Use the constructor that receives a lifetime parameter")]
  58                 public Tds70 (string server, int port)
  59                         : this (server, port, 512, 15, 0)
  60                 {
  61                 }
  62
  63                 [Obsolete ("Use the constructor that receives a lifetime parameter")]
  64                 public Tds70 (string server, int port, int packetSize, int timeout)
  65                         : this (server, port, packetSize, timeout, 0, TdsVersion.tds70)
  66                 {
  67                 }
  68
  69                 [Obsolete ("Use the constructor that receives a lifetime parameter")]
  70                 public Tds70 (string server, int port, int packetSize, int timeout, TdsVersion version)
  71                         : this (server, port, packetSize, timeout, 0, version)
  72                 {
  73                 }
  74
  75                 public Tds70 (string server, int port, int lifetime)
  76                         : this (server, port, 512, 15, lifetime)
  77                 {
  78                 }
  79
  80                 public Tds70 (string server, int port, int packetSize, int timeout, int lifeTime)
  81                         : base (server, port, packetSize, timeout, lifeTime, TdsVersion.tds70)
  82                 {
  83                 }
  84
  85                 public Tds70 (string server, int port, int packetSize, int timeout, int lifeTime, TdsVersion version)
  86                         : base (server, port, packetSize, timeout, lifeTime, version)
  87                 {
  88                 }
  89
  90                 #endregion // Constructors
  91
  92                 #region Properties
  93
  94                 protected virtual byte[] ClientVersion {
  95                         get { return new byte[] {0x00, 0x0, 0x0, 0x70};}
  96                 }
  97
  98                 // Default precision is 28 for a 7.0 server. Unless and
  99                 // otherwise the server is started with /p option - which would be 38
 100                 protected virtual byte Precision {
 101                         get { return 28; }
 102                 }
 103
 104                 #endregion // Properties
 105
 106                 #region Methods
 107
 108                 protected string BuildExec (string sql)
 109                 {
 110                         string esql = sql.Replace ("'", "''"); // escape single quote
 111                         if (Parameters != null && Parameters.Count > 0)
 112                                 return BuildProcedureCall (String.Format ("sp_executesql N'{0}', N'{1}', ", esql, BuildPreparedParameters ()));
 113                         else
 114                                 return BuildProcedureCall (String.Format ("sp_executesql N'{0}'", esql));
 115                 }
 116
 117                 private string BuildParameters ()
 118                 {
 119                         if (Parameters == null || Parameters.Count == 0)
 120                                 return String.Empty;
 121
 122                         StringBuilder result = new StringBuilder ();
 123                         foreach (TdsMetaParameter p in Parameters) {
 124                                 string parameterName = p.ParameterName;
 125                                 if (parameterName [0] == '@') {
 126                                         parameterName = parameterName.Substring (1);
 127                                 }
 128                                 if (p.Direction != TdsParameterDirection.ReturnValue) {
 129                                         if (result.Length > 0)
 130                                                 result.Append (", ");
 131                                         if (p.Direction == TdsParameterDirection.InputOutput)
 132                                                 result.AppendFormat ("@{0}={0} output", parameterName);
 133                                         else
 134                                                 result.Append (FormatParameter (p));
 135                                 }
 136                         }
 137                         return result.ToString ();
 138                 }
 139
 140                 private string BuildPreparedParameters ()
 141                 {
 142                         StringBuilder parms = new StringBuilder ();
 143                         foreach (TdsMetaParameter p in Parameters) {
 144                                 if (parms.Length > 0)
 145                                         parms.Append (", ");
 146
 147                                 // Set default precision according to the TdsVersion
 148                                 // Current default is 29 for Tds80
 149                                 if (p.TypeName == "decimal")
 150                                         p.Precision = (p.Precision !=0  ? p.Precision : (byte) Precision);
 151
 152                                 parms.Append (p.Prepare ());
 153                                 if (p.Direction == TdsParameterDirection.Output)
 154                                         parms.Append (" output");
 155                         }
 156                         return parms.ToString ();
 157                 }
 158
 159                 private string BuildPreparedQuery (string id)
 160                 {
 161                         return BuildProcedureCall (String.Format ("sp_execute {0},", id));
 162                 }
 163
 164                 private string BuildProcedureCall (string procedure)
 165                 {
 166                         string exec = String.Empty;
 167
 168                         StringBuilder declare = new StringBuilder ();
 169                         StringBuilder select = new StringBuilder ();
 170                         StringBuilder set = new StringBuilder ();
 171
 172                         int count = 0;
 173                         if (Parameters != null) {
 174                                 foreach (TdsMetaParameter p in Parameters) {
 175                                         string parameterName = p.ParameterName;
 176                                         if (parameterName [0] == '@') {
 177                                                 parameterName = parameterName.Substring (1);
 178                                         }
 179
 180                                         if (p.Direction != TdsParameterDirection.Input) {
 181                                                 if (count == 0)
 182                                                         select.Append ("select ");
 183                                                 else
 184                                                         select.Append (", ");
 185                                                 select.Append ("@" + parameterName);
 186
 187                                                 if (p.TypeName == "decimal")
 188                                                         p.Precision = (p.Precision !=0 ? p.Precision : (byte) Precision);
 189
 190                                                 declare.Append (String.Format ("declare {0}\n", p.Prepare ()));
 191
 192                                                 if (p.Direction != TdsParameterDirection.ReturnValue) {
 193                                                         if (p.Direction == TdsParameterDirection.InputOutput)
 194                                                                 set.Append (String.Format ("set {0}\n", FormatParameter(p)));
 195                                                         else
 196                                                                 set.Append (String.Format ("set @{0}=NULL\n", parameterName));
 197                                                 }
 198
 199                                                 count++;
 200                                         }
 201                                         if (p.Direction == TdsParameterDirection.ReturnValue)
 202                                                 exec = "@" + parameterName + "=";
 203                                 }
 204                         }
 205                         exec = "exec " + exec;
 206
 207                         return String.Format ("{0}{1}{2}{3} {4}\n{5}",
 208                                 declare.ToString (), set.ToString (), exec,
 209                                 procedure, BuildParameters (), select.ToString ());
 210                 }
 211
 212                 public override bool Connect (TdsConnectionParameters connectionParameters)
 213                 {
 214                         if (IsConnected)
 215                                 throw new InvalidOperationException ("The connection is already open.");
 216
 217                         connectionParms = connectionParameters;
 218
 219                         SetLanguage (connectionParameters.Language);
 220                         SetCharset ("utf-8");
 221
 222                         byte[] empty = new byte[0];
 223                         short authLen = 0;
 224                         byte pad = (byte) 0;
 225
 226                         byte[] domainMagic = { 6, 0x7d, 0x0f, 0xfd, 0xff, 0x0, 0x0, 0x0,
 227                                                                         0x0, 0xe0, 0x83, 0x0, 0x0,
 228                                                                         0x68, 0x01, 0x00, 0x00, 0x09, 0x04, 0x00, 0x00 };
 229                         byte[] sqlserverMagic = { 6, 0x0, 0x0, 0x0,
 230                                                                                 0x0, 0x0, 0x0, 0x0,
 231                                                                                 0x0, 0xe0, 0x03, 0x0,
 232                                                                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 233                                                                                 0x0, 0x0, 0x0 };
 234                         byte[] magic = null;
 235
 236                         if (connectionParameters.DomainLogin)
 237                                 magic = domainMagic;
 238                         else
 239                                 magic = sqlserverMagic;
 240
 241                         string username = connectionParameters.User;
 242                         string domain = null;
 243
 244                         int idx = username.IndexOf ("\\");
 245                         if (idx != -1) {
 246                                 domain = username.Substring (0, idx);
 247                                 username = username.Substring (idx + 1);
 248
 249                                 connectionParameters.DefaultDomain = domain;
 250                                 connectionParameters.User = username;
 251                         } else {
 252                                 domain = Environment.UserDomainName;
 253                                 connectionParameters.DefaultDomain = domain;
 254                         }
 255
 256                         short partialPacketSize = (short) (86 + (
 257                                 connectionParameters.Hostname.Length +
 258                                 connectionParameters.ApplicationName.Length +
 259                                 DataSource.Length +
 260                                 connectionParameters.LibraryName.Length +
 261                                 Language.Length +
 262                                 connectionParameters.Database.Length +
 263                                 connectionParameters.AttachDBFileName.Length) * 2);
 264
 265                         if (connectionParameters.DomainLogin) {
 266                                 authLen = ((short) (32 + (connectionParameters.Hostname.Length +
 267                                         domain.Length)));
 268                                 partialPacketSize += authLen;
 269                         } else
 270                                 partialPacketSize += ((short) ((username.Length + connectionParameters.Password.Length) * 2));
 271
 272                         int totalPacketSize = partialPacketSize;
 273
 274                         Comm.StartPacket (TdsPacketType.Logon70);
 275
 276                         Comm.Append (totalPacketSize);
 277
 278                         //Comm.Append (empty, 3, pad);
 279                         //byte[] version = {0x00, 0x0, 0x0, 0x71};
 280                         //Console.WriteLine ("Version: {0}", ClientVersion[3]);
 281                         Comm.Append (ClientVersion); // TDS Version 7
 282                         Comm.Append ((int)this.PacketSize); // Set the Block Size
 283                         Comm.Append (empty, 3, pad);
 284                         Comm.Append (magic);
 285
 286                         short curPos = 86;
 287
 288                         // Hostname
 289                         Comm.Append (curPos);
 290                         Comm.Append ((short) connectionParameters.Hostname.Length);
 291                         curPos += (short) (connectionParameters.Hostname.Length * 2);
 292
 293                         if (connectionParameters.DomainLogin) {
 294                                 Comm.Append((short)0);
 295                                 Comm.Append((short)0);
 296                                 Comm.Append((short)0);
 297                                 Comm.Append((short)0);
 298                         } else {
 299                                 // Username
 300                                 Comm.Append (curPos);
 301                                 Comm.Append ((short) username.Length);
 302                                 curPos += ((short) (username.Length * 2));
 303
 304                                 // Password
 305                                 Comm.Append (curPos);
 306                                 Comm.Append ((short) connectionParameters.Password.Length);
 307                                 curPos += (short) (connectionParameters.Password.Length * 2);
 308                         }
 309
 310                         // AppName
 311                         Comm.Append (curPos);
 312                         Comm.Append ((short) connectionParameters.ApplicationName.Length);
 313                         curPos += (short) (connectionParameters.ApplicationName.Length * 2);
 314
 315                         // Server Name
 316                         Comm.Append (curPos);
 317                         Comm.Append ((short) DataSource.Length);
 318                         curPos += (short) (DataSource.Length * 2);
 319
 320                         // Unknown
 321                         Comm.Append ((short) curPos);
 322                         Comm.Append ((short) 0);
 323
 324                         // Library Name
 325                         Comm.Append (curPos);
 326                         Comm.Append ((short) connectionParameters.LibraryName.Length);
 327                         curPos += (short) (connectionParameters.LibraryName.Length * 2);
 328
 329                         // Language
 330                         Comm.Append (curPos);
 331                         Comm.Append ((short) Language.Length);
 332                         curPos += (short) (Language.Length * 2);
 333
 334                         // Database
 335                         Comm.Append (curPos);
 336                         Comm.Append ((short) connectionParameters.Database.Length);
 337                         curPos += (short) (connectionParameters.Database.Length * 2);
 338
 339                         // MAC Address
 340                         Comm.Append((byte) 0);
 341                         Comm.Append((byte) 0);
 342                         Comm.Append((byte) 0);
 343                         Comm.Append((byte) 0);
 344                         Comm.Append((byte) 0);
 345                         Comm.Append((byte) 0);
 346
 347                         // Authentication Stuff
 348                         Comm.Append ((short) curPos);
 349                         if (connectionParameters.DomainLogin) {
 350                                 Comm.Append ((short) authLen);
 351                                 curPos += (short) authLen;
 352                         } else
 353                                 Comm.Append ((short) 0);
 354
 355                         // Unknown
 356                         Comm.Append (curPos);
 357                         Comm.Append ((short)( connectionParameters.AttachDBFileName.Length));
 358                         curPos += (short)(connectionParameters.AttachDBFileName.Length*2);
 359
 360                         // Connection Parameters
 361                         Comm.Append (connectionParameters.Hostname);
 362                         if (!connectionParameters.DomainLogin) {
 363                                 // SQL Server Authentication
 364                                 Comm.Append (connectionParameters.User);
 365                                 string scrambledPwd = EncryptPassword (connectionParameters.Password);
 366                                 Comm.Append (scrambledPwd);
 367                         }
 368                         Comm.Append (connectionParameters.ApplicationName);
 369                         Comm.Append (DataSource);
 370                         Comm.Append (connectionParameters.LibraryName);
 371                         Comm.Append (Language);
 372                         Comm.Append (connectionParameters.Database);
 373
 374                         if (connectionParameters.DomainLogin) {
 375                                 // the rest of the packet is NTLMSSP authentication
 376                                 Type1Message msg = new Type1Message ();
 377                                 msg.Domain = domain;
 378                                 msg.Host = connectionParameters.Hostname;
 379                                 msg.Flags = NtlmFlags.NegotiateUnicode |
 380                                         NtlmFlags.NegotiateNtlm |
 381                                         NtlmFlags.NegotiateDomainSupplied |
 382                                         NtlmFlags.NegotiateWorkstationSupplied |
 383                                         NtlmFlags.NegotiateAlwaysSign; // 0xb201
 384                                 Comm.Append (msg.GetBytes ());
 385                         }
 386
 387                         Comm.Append (connectionParameters.AttachDBFileName);
 388                         Comm.SendPacket ();
 389                         MoreResults = true;
 390                         SkipToEnd ();
 391
 392                         return IsConnected;
 393                 }
 394
 395                 private static string EncryptPassword (string pass)
 396                 {
 397                         int xormask = 0x5a5a;
 398                         int len = pass.Length;
 399                         char[] chars = new char[len];
 400
 401                         for (int i = 0; i < len; ++i) {
 402                                 int c = ((int) (pass[i])) ^ xormask;
 403                                 int m1 = (c >> 4) & 0x0f0f;
 404                                 int m2 = (c << 4) & 0xf0f0;
 405                                 chars[i] = (char) (m1 | m2);
 406                         }
 407
 408                         return new String (chars);
 409                 }
 410
 411                 public override bool Reset ()
 412                 {
 413                         // Check validity of the connection - a false removes
 414                         // the connection from the pool
 415                         // NOTE: MS implementation will throw a connection-reset error as it will
 416                         // try to use the same connection
 417                         if (!Comm.IsConnected ())
 418                                 return false;
 419
 420                         // Set "reset-connection" bit for the next message packet
 421                         Comm.ResetConnection = true;
 422                         base.Reset ();
 423                         return true;
 424                 }
 425
 426                 public override void ExecPrepared (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 427                 {
 428                         Parameters = parameters;
 429                         ExecuteQuery (BuildPreparedQuery (commandText), timeout, wantResults);
 430                 }
 431
 432                 public override void ExecProc (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 433                 {
 434                         Parameters = parameters;
 435                         ExecRPC (commandText, parameters, timeout, wantResults);
 436                 }
 437
 438                 private void WriteRpcParameterInfo (TdsMetaParameterCollection parameters)
 439                 {
 440                         if (parameters != null) {
 441                                 foreach (TdsMetaParameter param in parameters) {
 442                                         if (param.Direction == TdsParameterDirection.ReturnValue)
 443                                                 continue;
 444                                         string pname = param.ParameterName;
 445                                         if (pname != null && pname.Length > 0 && pname [0] == '@') {
 446                                                 Comm.Append ( (byte) pname.Length);
 447                                                 Comm.Append (pname);
 448                                         } else {
 449                                                 Comm.Append ( (byte) (pname.Length + 1));
 450                                                 Comm.Append ("@" + pname);
 451                                         }
 452                                         short status = 0; // unused
 453                                         if (param.Direction != TdsParameterDirection.Input)
 454                                                 status |= 0x01; // output
 455                                         Comm.Append ( (byte) status);
 456                                         WriteParameterInfo (param);
 457                                 }
 458                         }
 459                 }
 460
 461                 private void WritePreparedParameterInfo (TdsMetaParameterCollection parameters)
 462                 {
 463                         if (parameters == null)
 464                                 return;
 465
 466                         string param = BuildPreparedParameters ();
 467                         Comm.Append ((byte) 0x00); // no param meta data name
 468                         Comm.Append ((byte) 0x00); // no status flags
 469
 470                         // Type_info - parameter info
 471                         WriteParameterInfo (new TdsMetaParameter ("prep_params",
 472                                                                   param.Length > 4000 ? "ntext" : "nvarchar",
 473                                                                   param));
 474                 }
 475
 476                 protected void ExecRPC (TdsRpcProcId rpcId, string sql,
 477                                         TdsMetaParameterCollection parameters,
 478                                         int timeout, bool wantResults)
 479                 {
 480                         // clean up
 481                         InitExec ();
 482                         Comm.StartPacket (TdsPacketType.RPC);
 483
 484                         Comm.Append ((ushort) 0xFFFF);
 485                         Comm.Append ((ushort) rpcId);
 486                         Comm.Append ((short) 0x02); // no meta data
 487
 488                         Comm.Append ((byte) 0x00); // no param meta data name
 489                         Comm.Append ((byte) 0x00); // no status flags
 490
 491                         // Write sql as a parameter value - UCS2
 492                         TdsMetaParameter param = new TdsMetaParameter ("sql",
 493                                                                        sql.Length > 4000 ? "ntext":"nvarchar",
 494                                                                        sql);
 495                         WriteParameterInfo (param);
 496
 497                         // Write Parameter infos - name and type
 498                         WritePreparedParameterInfo (parameters);
 499
 500                         // Write parameter/value info
 501                         WriteRpcParameterInfo (parameters);
 502                         Comm.SendPacket ();
 503                         CheckForData (timeout);
 504                         if (!wantResults)
 505                                 SkipToEnd ();
 506                 }
 507
 508                 protected override void ExecRPC (string rpcName, TdsMetaParameterCollection parameters,
 509                                                  int timeout, bool wantResults)
 510                 {
 511                         // clean up
 512                         InitExec ();
 513                         Comm.StartPacket (TdsPacketType.RPC);
 514
 515                         Comm.Append ( (short) rpcName.Length);
 516                         Comm.Append (rpcName);
 517                         Comm.Append ( (short) 0); //no meta data
 518                         WriteRpcParameterInfo (parameters);
 519                         Comm.SendPacket ();
 520                         CheckForData (timeout);
 521                         if (!wantResults)
 522                                 SkipToEnd ();
 523                 }
 524
 525                 private void WriteParameterInfo (TdsMetaParameter param)
 526                 {
 527                         /*
 528                         Ms.net send non-nullable datatypes as nullable and allows setting null values
 529                         to int/float etc.. So, using Nullable form of type for all data
 530                         */
 531                         param.IsNullable = true;
 532                         TdsColumnType colType = param.GetMetaType ();
 533                         param.IsNullable = false;
 534
 535                         bool partLenType = false;
 536                         int size = param.Size;
 537                         if (size < 1) {
 538                                 if (size < 0)
 539                                         partLenType = true;
 540                                 size = param.GetActualSize ();
 541                         }
 542
 543                         /*
 544                          * If the value is null, not setting the size to 0 will cause varchar
 545                          * fields to get inserted as an empty string rather than an null.
 546                          */
 547                         if (param.Value == null || param.Value == DBNull.Value)
 548                                 size = 0;
 549
 550                         // Change colType according to the following table
 551                         /*
 552                          * Original Type        Maxlen          New Type
 553                          *
 554                          * NVarChar             4000 UCS2       NText
 555                          * BigVarChar           8000 ASCII      Text
 556                          * BigVarBinary         8000 bytes      Image
 557                          *
 558                          */
 559                         TdsColumnType origColType = colType;
 560                         if (colType == TdsColumnType.BigNVarChar) {
 561                                 // param.GetActualSize() returns len*2
 562                                 if (size == param.Size)
 563                                         size <<= 1;
 564                                 if ((size >> 1) > 4000)
 565                                         colType = TdsColumnType.NText;
 566                         } else if (colType == TdsColumnType.BigVarChar) {
 567                                 if (size > 8000)
 568                                         colType = TdsColumnType.Text;
 569                         } else if (colType == TdsColumnType.BigVarBinary) {
 570                                 if (size > 8000)
 571                                         colType = TdsColumnType.Image;
 572                         }
 573                         // Calculation of TypeInfo field
 574                         /*
 575                          * orig size value              TypeInfo field
 576                          *
 577                          * >= 0 <= Maxlen               origColType + content len
 578                          * > Maxlen             NewType as per above table + content len
 579                          * -1           origColType + USHORTMAXLEN (0xFFFF) + content len (TDS 9)
 580                          *
 581                          */
 582                         // Write updated colType, iff partLenType == false
 583                         if (TdsVersion > TdsVersion.tds81 && partLenType) {
 584                                 Comm.Append ((byte)origColType);
 585                                 Comm.Append ((short)-1);
 586                         } else if (ServerTdsVersion > TdsVersion.tds70
 587                                    && origColType == TdsColumnType.Decimal) {
 588                                 Comm.Append ((byte)TdsColumnType.Numeric);
 589                         } else {
 590                                 Comm.Append ((byte)colType);
 591                         }
 592
 593                         if (IsLargeType (colType))
 594                                 Comm.Append ((short)size); // Parameter size passed in SqlParameter
 595                         else if (IsBlobType (colType))
 596                                 Comm.Append (size); // Parameter size passed in SqlParameter
 597                         else
 598                                 Comm.Append ((byte)size);
 599
 600                         // Precision and Scale are non-zero for only decimal/numeric
 601                         if ( param.TypeName == "decimal" || param.TypeName == "numeric") {
 602                                 Comm.Append ((param.Precision !=0 ) ? param.Precision : Precision);
 603                                 Comm.Append (param.Scale);
 604                                 // Convert the decimal value according to Scale
 605                                 if (param.Value != null && param.Value != DBNull.Value &&
 606                                     ((decimal)param.Value) != Decimal.MaxValue &&
 607                                     ((decimal)param.Value) != Decimal.MinValue &&
 608                                     ((decimal)param.Value) != long.MaxValue &&
 609                                     ((decimal)param.Value) != long.MinValue &&
 610                                     ((decimal)param.Value) != ulong.MaxValue &&
 611                                     ((decimal)param.Value) != ulong.MinValue) {
 612                                         long expo = (long)new Decimal (System.Math.Pow (10, (double)param.Scale));
 613                                         long pVal = (long)(((decimal)param.Value) * expo);
 614                                         param.Value = pVal;
 615                                 }
 616                         }
 617
 618
 619                         /* VARADHAN: TDS 8 Debugging */
 620                         /*
 621                         if (Collation != null) {
 622                                 Console.WriteLine ("Collation is not null");
 623                                 Console.WriteLine ("Column Type: {0}", colType);
 624                                 Console.WriteLine ("Collation bytes: {0} {1} {2} {3} {4}", Collation[0], Collation[1], Collation[2],
 625                                                    Collation[3], Collation[4]);
 626                         } else {
 627                                 Console.WriteLine ("Collation is null");
 628                         }
 629                         */
 630
 631                         // Tds > 7.0 uses collation
 632                         if (Collation != null &&
 633                             (colType == TdsColumnType.BigChar || colType == TdsColumnType.BigNVarChar ||
 634                              colType == TdsColumnType.BigVarChar || colType == TdsColumnType.NChar ||
 635                              colType == TdsColumnType.NVarChar || colType == TdsColumnType.Text ||
 636                              colType == TdsColumnType.NText))
 637                                 Comm.Append (Collation);
 638
 639                         // LAMESPEC: size should be 0xFFFF for any bigvarchar, bignvarchar and bigvarbinary
 640                         // types if param value is NULL
 641                         if ((colType == TdsColumnType.BigVarChar ||
 642                              colType == TdsColumnType.BigNVarChar ||
 643                              colType == TdsColumnType.BigVarBinary ||
 644                              colType == TdsColumnType.Image) &&
 645                             (param.Value == null || param.Value == DBNull.Value))
 646                                 size = -1;
 647                         else
 648                                 size = param.GetActualSize ();
 649
 650                         if (IsLargeType (colType))
 651                                 Comm.Append ((short)size);
 652                         else if (IsBlobType (colType))
 653                                 Comm.Append (size);
 654                         else
 655                                 Comm.Append ((byte)size);
 656
 657                         if (size > 0) {
 658                                 switch (param.TypeName) {
 659                                 case "money" : {
 660                                         // 4 == SqlMoney::MoneyFormat.NumberDecimalDigits
 661                                         Decimal val = Decimal.Round ((decimal) param.Value, 4);
 662                                         int[] arr = Decimal.GetBits (val);
 663
 664                                         if (val >= 0) {
 665                                                 Comm.Append (arr[1]);
 666                                                 Comm.Append (arr[0]);
 667                                         } else {
 668                                                 Comm.Append (~arr[1]);
 669                                                 Comm.Append (~arr[0] + 1);
 670                                         }
 671                                         break;
 672                                 }
 673                                 case "smallmoney": {
 674                                         // 4 == SqlMoney::MoneyFormat.NumberDecimalDigits
 675                                         Decimal val = Decimal.Round ((decimal) param.Value, 4);
 676                                         if (val < SMALLMONEY_MIN || val > SMALLMONEY_MAX)
 677                                                 throw new OverflowException (string.Format (
 678                                                         CultureInfo.InvariantCulture,
 679                                                         "Value '{0}' is not valid for SmallMoney."
 680                                                         + "  Must be between {1:N4} and {2:N4}.",
 681 #if NET_2_0
 682                                                         val,
 683 #else
 684                                                         val.ToString (CultureInfo.CurrentCulture),
 685 #endif
 686                                                         SMALLMONEY_MIN, SMALLMONEY_MAX));
 687
 688                                         int[] arr = Decimal.GetBits (val);
 689                                         int sign = (val>0 ? 1: -1);
 690                                         Comm.Append (sign * arr[0]);
 691                                         break;
 692                                 }
 693                                 case "datetime":
 694                                         Comm.Append ((DateTime)param.Value, 8);
 695                                         break;
 696                                 case "smalldatetime":
 697                                         Comm.Append ((DateTime)param.Value, 4);
 698                                         break;
 699                                 case "varchar" :
 700                                 case "nvarchar" :
 701                                 case "char" :
 702                                 case "nchar" :
 703                                 case "text" :
 704                                 case "ntext" :
 705                                         byte [] tmp = param.GetBytes ();
 706                                         Comm.Append (tmp);
 707                                         break;
 708                                 case "uniqueidentifier" :
 709                                         Comm.Append (((Guid)param.Value).ToByteArray());
 710                                         break;
 711                                 default :
 712                                         Comm.Append (param.Value);
 713                                         break;
 714                                 }
 715                         }
 716                         return;
 717                 }
 718
 719                 public override void Execute (string commandText, TdsMetaParameterCollection parameters, int timeout, bool wantResults)
 720                 {
 721                         Parameters = parameters;
 722                         string sql = commandText;
 723                         if (wantResults || (Parameters != null && Parameters.Count > 0))
 724                                 sql = BuildExec (commandText);
 725                         ExecuteQuery (sql, timeout, wantResults);
 726                 }
 727
 728                 private string FormatParameter (TdsMetaParameter parameter)
 729                 {
 730                         string parameterName = parameter.ParameterName;
 731                         if (parameterName [0] == '@') {
 732                                 parameterName = parameterName.Substring (1);
 733                         }
 734                         if (parameter.Direction == TdsParameterDirection.Output)
 735                                 return String.Format ("@{0}=@{0} output", parameterName);
 736                         if (parameter.Value == null || parameter.Value == DBNull.Value)
 737                                 return String.Format ("@{0}=NULL", parameterName);
 738
 739                         string value = null;
 740                         switch (parameter.TypeName) {
 741                         case "smalldatetime":
 742                         case "datetime":
 743                                 DateTime d = Convert.ToDateTime (parameter.Value);
 744                                 value = String.Format (base.Locale,
 745                                         "'{0:MMM dd yyyy hh:mm:ss.fff tt}'", d);
 746                                 break;
 747                         case "bigint":
 748                         case "decimal":
 749                         case "float":
 750                         case "int":
 751                         case "money":
 752                         case "real":
 753                         case "smallint":
 754                         case "smallmoney":
 755                         case "tinyint":
 756                                 object paramValue = parameter.Value;
 757                                 Type paramType = paramValue.GetType ();
 758                                 if (paramType.IsEnum)
 759                                         paramValue = Convert.ChangeType (paramValue,
 760                                                 Type.GetTypeCode (paramType));
 761                                 value = paramValue.ToString ();
 762                                 break;
 763                         case "nvarchar":
 764                         case "nchar":
 765                                 value = String.Format ("N'{0}'", parameter.Value.ToString ().Replace ("'", "''"));
 766                                 break;
 767                         case "uniqueidentifier":
 768                                 value = String.Format ("'{0}'", ((Guid) parameter.Value).ToString (string.Empty));
 769                                 break;
 770                         case "bit":
 771                                 if (parameter.Value.GetType () == typeof (bool))
 772                                         value = (((bool) parameter.Value) ? "0x1" : "0x0");
 773                                 else
 774                                         value = parameter.Value.ToString ();
 775                                 break;
 776                         case "image":
 777                         case "binary":
 778                         case "varbinary":
 779                                 byte[] byteArray = (byte[]) parameter.Value;
 780                                 // In 1.0 profile, BitConverter.ToString() throws ArgumentOutOfRangeException when passed a 0-length
 781                                 // array, so handle that as a special case.
 782                                 if (byteArray.Length == 0)
 783                                         value = "0x";
 784                                 else
 785                                         value = String.Format ("0x{0}", BitConverter.ToString (byteArray).Replace ("-", string.Empty).ToLower ());
 786                                 break;
 787                         default:
 788                                 value = String.Format ("'{0}'", parameter.Value.ToString ().Replace ("'", "''"));
 789                                 break;
 790                         }
 791
 792                         return "@" + parameterName + "=" + value;
 793                 }
 794
 795                 public override string Prepare (string commandText, TdsMetaParameterCollection parameters)
 796                 {
 797                         Parameters = parameters;
 798
 799                         TdsMetaParameterCollection parms = new TdsMetaParameterCollection ();
 800                         // Tested with MS SQL 2008 RC2 Express and MS SQL 2012 Express:
 801                         // You may pass either -1 or 0, but not null as initial value of @Handle,
 802                         // which is an output parameter.
 803                         TdsMetaParameter parm = new TdsMetaParameter ("@Handle", "int", -1);
 804                         parm.Direction = TdsParameterDirection.Output;
 805                         parms.Add (parm);
 806
 807                         parms.Add (new TdsMetaParameter ("@VarDecl", "nvarchar", BuildPreparedParameters ()));
 808                         parms.Add (new TdsMetaParameter ("@Query", "nvarchar", commandText));
 809
 810                         ExecProc ("sp_prepare", parms, 0, true);
 811                         SkipToEnd ();
 812                         return OutputParameters[0].ToString () ;
 813                         //if (ColumnValues == null || ColumnValues [0] == null || ColumnValues [0] == DBNull.Value)
 814                         //      throw new TdsInternalException ();
 815                         //return string.Empty;
 816                         //return ColumnValues [0].ToString ();
 817                 }
 818
 819                 protected override void ProcessColumnInfo ()
 820                 {
 821                         int numColumns = Comm.GetTdsShort ();
 822                         for (int i = 0; i < numColumns; i += 1) {
 823                                 byte[] flagData = new byte[4];
 824                                 for (int j = 0; j < 4; j += 1)
 825                                         flagData[j] = Comm.GetByte ();
 826
 827                                 bool nullable = (flagData[2] & 0x01) > 0;
 828                                 //bool caseSensitive = (flagData[2] & 0x02) > 0;
 829                                 bool writable = (flagData[2] & 0x0c) > 0;
 830                                 bool autoIncrement = (flagData[2] & 0x10) > 0;
 831                                 bool isIdentity = (flagData[2] & 0x10) > 0;
 832
 833                                 TdsColumnType columnType = (TdsColumnType) ((Comm.GetByte () & 0xff));
 834
 835                                 byte xColumnType = 0;
 836                                 if (IsLargeType (columnType)) {
 837                                         xColumnType = (byte) columnType;
 838                                         if (columnType != TdsColumnType.NChar)
 839                                                 columnType -= 128;
 840                                 }
 841
 842                                 int columnSize;
 843                                 string tableName = null;
 844
 845                                 if (IsBlobType (columnType)) {
 846                                         columnSize = Comm.GetTdsInt ();
 847                                         tableName = Comm.GetString (Comm.GetTdsShort ());
 848                                 } else if (IsFixedSizeColumn (columnType)) {
 849                                         columnSize = LookupBufferSize (columnType);
 850                                 } else if (IsLargeType ((TdsColumnType) xColumnType)) {
 851                                         columnSize = Comm.GetTdsShort ();
 852                                 } else {
 853                                         columnSize = Comm.GetByte () & 0xff;
 854                                 }
 855
 856                                 if (IsWideType ((TdsColumnType) columnType))
 857                                         columnSize /= 2;
 858
 859                                 byte precision = 0;
 860                                 byte scale = 0;
 861
 862                                 if (columnType == TdsColumnType.Decimal || columnType == TdsColumnType.Numeric) {
 863                                         precision = Comm.GetByte ();
 864                                         scale = Comm.GetByte ();
 865                                 } else {
 866                                         precision = GetPrecision (columnType, columnSize);
 867                                         scale = GetScale (columnType, columnSize);
 868                                 }
 869
 870                                 string columnName = Comm.GetString (Comm.GetByte ());
 871
 872                                 TdsDataColumn col = new TdsDataColumn ();
 873                                 Columns.Add (col);
 874 #if NET_2_0
 875                                 col.ColumnType = columnType;
 876                                 col.ColumnName = columnName;
 877                                 col.IsAutoIncrement = autoIncrement;
 878                                 col.IsIdentity = isIdentity;
 879                                 col.ColumnSize = columnSize;
 880                                 col.NumericPrecision = precision;
 881                                 col.NumericScale = scale;
 882                                 col.IsReadOnly = !writable;
 883                                 col.AllowDBNull = nullable;
 884                                 col.BaseTableName = tableName;
 885                                 col.DataTypeName = Enum.GetName (typeof (TdsColumnType), xColumnType);
 886 #else
 887                                 col ["ColumnType"] = columnType;
 888                                 col ["ColumnName"] = columnName;
 889                                 col ["IsAutoIncrement"] = autoIncrement;
 890                                 col ["IsIdentity"] = isIdentity;
 891                                 col ["ColumnSize"] = columnSize;
 892                                 col ["NumericPrecision"] = precision;
 893                                 col ["NumericScale"] = scale;
 894                                 col ["IsReadOnly"] = !writable;
 895                                 col ["AllowDBNull"] = nullable;
 896                                 col ["BaseTableName"] = tableName;
 897                                 col ["DataTypeName"] = Enum.GetName (typeof (TdsColumnType), xColumnType);
 898 #endif
 899                         }
 900                 }
 901
 902                 public override void Unprepare (string statementId)
 903                 {
 904                         TdsMetaParameterCollection parms = new TdsMetaParameterCollection ();
 905                         parms.Add (new TdsMetaParameter ("@P1", "int", Int32.Parse (statementId)));
 906                         ExecProc ("sp_unprepare", parms, 0, false);
 907                 }
 908
 909                 protected override bool IsValidRowCount (byte status, byte op)
 910                 {
 911                         if ((status & (byte)0x10) == 0 || op == (byte)0xc1)
 912                                 return false;
 913                         return true;
 914                 }
 915
 916                 protected override void ProcessReturnStatus ()
 917                 {
 918                         int result = Comm.GetTdsInt ();
 919                         if (Parameters != null) {
 920                                 foreach (TdsMetaParameter param in Parameters) {
 921                                         if (param.Direction == TdsParameterDirection.ReturnValue) {
 922                                                 param.Value = result;
 923                                                 break;
 924                                         }
 925                                 }
 926                         }
 927                 }
 928
 929                 byte GetScale (TdsColumnType type, int columnSize)
 930                 {
 931                         switch (type) {
 932                         case TdsColumnType.DateTime:
 933                                 return 0x03;
 934                         case TdsColumnType.DateTime4:
 935                                 return 0x00;
 936                         case TdsColumnType.DateTimeN:
 937                                 switch (columnSize) {
 938                                 case 4:
 939                                         return 0x00;
 940                                 case 8:
 941                                         return 0x03;
 942                                 }
 943                                 break;
 944                         default:
 945                                 return 0xff;
 946                         }
 947
 948                         throw new NotSupportedException (string.Format (
 949                                 CultureInfo.InvariantCulture,
 950                                 "Fixed scale not defined for column " +
 951                                 "type '{0}' with size {1}.", type, columnSize));
 952                 }
 953
 954                 byte GetPrecision (TdsColumnType type, int columnSize)
 955                 {
 956                         switch (type) {
 957                         case TdsColumnType.Binary:
 958                                 return 0xff;
 959                         case TdsColumnType.Bit:
 960                                 return 0xff;
 961                         case TdsColumnType.Char:
 962                                 return 0xff;
 963                         case TdsColumnType.DateTime:
 964                                 return 0x17;
 965                         case TdsColumnType.DateTime4:
 966                                 return 0x10;
 967                         case TdsColumnType.DateTimeN:
 968                                 switch (columnSize) {
 969                                 case 4:
 970                                         return 0x10;
 971                                 case 8:
 972                                         return 0x17;
 973                                 }
 974                                 break;
 975                         case TdsColumnType.Real:
 976                                 return 0x07;
 977                         case TdsColumnType.Float8:
 978                                 return 0x0f;
 979                         case TdsColumnType.FloatN:
 980                                 switch (columnSize) {
 981                                 case 4:
 982                                         return 0x07;
 983                                 case 8:
 984                                         return 0x0f;
 985                                 }
 986                                 break;
 987                         case TdsColumnType.Image:
 988                                 return 0xff;
 989                         case TdsColumnType.Int1:
 990                                 return 0x03;
 991                         case TdsColumnType.Int2:
 992                                 return 0x05;
 993                         case TdsColumnType.Int4:
 994                                 return 0x0a;
 995                         case TdsColumnType.IntN:
 996                                 switch (columnSize) {
 997                                 case 1:
 998                                         return 0x03;
 999                                 case 2:
1000                                         return 0x05;
1001                                 case 4:
1002                                         return 0x0a;
1003                                 }
1004                                 break;
1005                         case TdsColumnType.Void:
1006                                 return 0x01;
1007                         case TdsColumnType.Text:
1008                                 return 0xff;
1009                         case TdsColumnType.UniqueIdentifier:
1010                                 return 0xff;
1011                         case TdsColumnType.VarBinary:
1012                                 return 0xff;
1013                         case TdsColumnType.VarChar:
1014                                 return 0xff;
1015                         case TdsColumnType.Money:
1016                                 return 19;
1017                         case TdsColumnType.NText:
1018                                 return 0xff;
1019                         case TdsColumnType.NVarChar:
1020                                 return 0xff;
1021                         case TdsColumnType.BitN:
1022                                 return 0xff;
1023                         case TdsColumnType.MoneyN:
1024                                 switch (columnSize) {
1025                                 case 4:
1026                                         return 0x0a;
1027                                 case 8:
1028                                         return 0x13;
1029                                 }
1030                                 break;
1031                         case TdsColumnType.Money4:
1032                                 return 0x0a;
1033                         case TdsColumnType.NChar:
1034                                 return 0xff;
1035                         case TdsColumnType.BigBinary:
1036                                 return 0xff;
1037                         case TdsColumnType.BigVarBinary:
1038                                 return 0xff;
1039                         case TdsColumnType.BigVarChar:
1040                                 return 0xff;
1041                         case TdsColumnType.BigNVarChar:
1042                                 return 0xff;
1043                         case TdsColumnType.BigChar:
1044                                 return 0xff;
1045                         case TdsColumnType.SmallMoney:
1046                                 return 0x0a;
1047                         case TdsColumnType.Variant:
1048                                 return 0xff;
1049                         case TdsColumnType.BigInt:
1050                                 return 0xff;
1051                         }
1052
1053                         throw new NotSupportedException (string.Format (
1054                                 CultureInfo.InvariantCulture,
1055                                 "Fixed precision not defined for column " +
1056                                 "type '{0}' with size {1}.", type, columnSize));
1057                 }
1058
1059                 #endregion // Methods
1060
1061 #if NET_2_0
1062                 #region Asynchronous Methods
1063
1064                 public override IAsyncResult BeginExecuteNonQuery (string cmdText,
1065                                                           TdsMetaParameterCollection parameters,
1066                                                           AsyncCallback callback,
1067                                                           object state)
1068                 {
1069                         Parameters = parameters;
1070                         string sql = cmdText;
1071                         if (Parameters != null && Parameters.Count > 0)
1072                                 sql = BuildExec (cmdText);
1073
1074                         IAsyncResult ar = BeginExecuteQueryInternal (sql, false, callback, state);
1075                         return ar;
1076                 }
1077
1078                 public override void EndExecuteNonQuery (IAsyncResult ar)
1079                 {
1080                         EndExecuteQueryInternal (ar);
1081                 }
1082
1083                 public override IAsyncResult BeginExecuteQuery (string cmdText,
1084                                                                 TdsMetaParameterCollection parameters,
1085                                                                 AsyncCallback callback,
1086                                                                 object state)
1087                 {
1088                         Parameters = parameters;
1089                         string sql = cmdText;
1090                         if (Parameters != null && Parameters.Count > 0)
1091                                 sql = BuildExec (cmdText);
1092
1093                         IAsyncResult ar = BeginExecuteQueryInternal (sql, true, callback, state);
1094                         return ar;
1095                 }
1096
1097                 public override void EndExecuteQuery (IAsyncResult ar)
1098                 {
1099                         EndExecuteQueryInternal (ar);
1100                 }
1101
1102                 public override IAsyncResult BeginExecuteProcedure (string prolog,
1103                                                                     string epilog,
1104                                                                     string cmdText,
1105                                                                     bool IsNonQuery,
1106                                                                     TdsMetaParameterCollection parameters,
1107                                                                     AsyncCallback callback,
1108                                                                     object state)
1109                 {
1110                         Parameters = parameters;
1111                         string pcall = BuildProcedureCall (cmdText);
1112                         string sql = String.Format ("{0};{1};{2};", prolog, pcall, epilog);
1113
1114                         IAsyncResult ar = BeginExecuteQueryInternal (sql, !IsNonQuery, callback, state);
1115                         return ar;
1116                 }
1117
1118                 public override void EndExecuteProcedure (IAsyncResult ar)
1119                 {
1120                         EndExecuteQueryInternal (ar);
1121                 }
1122
1123                 #endregion // Asynchronous Methods
1124 #endif // NET_2_0
1125         }
1126 }