mcs/class/Mono.Data.SybaseClient/Mono.Data.SybaseClient/SybaseDataReader.cs

   1 //
   2 // Mono.Data.SybaseClient.SybaseDataReader.cs
   3 //
   4 // Author:
   5 //   Rodrigo Moya (rodrigo@ximian.com)
   6 //   Daniel Morgan (danmorg@sc.rr.com)
   7 //   Tim Coleman (tim@timcoleman.com)
   8 //
   9 // (C) Ximian, Inc 2002
  10 // (C) Daniel Morgan 2002
  11 // Copyright (C) Tim Coleman, 2002
  12 //
  13
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using Mono.Data.SybaseTypes;
  36 using Mono.Data.Tds.Protocol;
  37 using System;
  38 using System.Collections;
  39 using System.ComponentModel;
  40 using System.Data;
  41 using System.Data.Common;
  42
  43 namespace Mono.Data.SybaseClient {
  44         public sealed class SybaseDataReader : MarshalByRefObject, IEnumerable, IDataReader, IDisposable, IDataRecord
  45         {
  46                 #region Fields
  47
  48                 SybaseCommand command;
  49                 ArrayList dataTypeNames;
  50                 bool disposed = false;
  51                 int fieldCount;
  52                 bool isClosed;
  53                 bool isSelect;
  54                 bool moreResults;
  55                 int resultsRead;
  56                 int rowsRead;
  57                 DataTable schemaTable;
  58
  59                 #endregion // Fields
  60
  61                 #region Constructors
  62
  63                 internal SybaseDataReader (SybaseCommand command)
  64                 {
  65                         this.command = command;
  66                         schemaTable = ConstructSchemaTable ();
  67                         resultsRead = 0;
  68                         fieldCount = 0;
  69                         isClosed = false;
  70                         isSelect = (command.CommandText.Trim ().ToUpper ().StartsWith ("SELECT"));
  71                         command.Tds.RecordsAffected = 0;
  72                         NextResult ();
  73                 }
  74
  75                 #endregion // Constructors
  76
  77                 #region Properties
  78
  79                 public int Depth {
  80                         get { return 0; }
  81                 }
  82
  83                 public int FieldCount {
  84                         get { return fieldCount; }
  85                 }
  86
  87                 public bool IsClosed {
  88                         get { return isClosed; }
  89                 }
  90
  91                 public object this [int i] {
  92                         get { return GetValue (i); }
  93                 }
  94
  95                 public object this [string name] {
  96                         get { return GetValue (GetOrdinal (name)); }
  97                 }
  98
  99                 public int RecordsAffected {
 100                         get {
 101                                 if (isSelect)
 102                                         return -1;
 103                                 else
 104                                         return command.Tds.RecordsAffected;
 105                         }
 106                 }
 107
 108                 #endregion // Properties
 109
 110                 #region Methods
 111
 112                 public void Close ()
 113                 {
 114                         isClosed = true;
 115                         command.CloseDataReader (moreResults);
 116                 }
 117
 118                 private static DataTable ConstructSchemaTable ()
 119                 {
 120                         Type booleanType = Type.GetType ("System.Boolean");
 121                         Type stringType = Type.GetType ("System.String");
 122                         Type intType = Type.GetType ("System.Int32");
 123                         Type typeType = Type.GetType ("System.Type");
 124                         Type shortType = Type.GetType ("System.Int16");
 125
 126                         DataTable schemaTable = new DataTable ("SchemaTable");
 127                         schemaTable.Columns.Add ("ColumnName", stringType);
 128                         schemaTable.Columns.Add ("ColumnOrdinal", intType);
 129                         schemaTable.Columns.Add ("ColumnSize", intType);
 130                         schemaTable.Columns.Add ("NumericPrecision", shortType);
 131                         schemaTable.Columns.Add ("NumericScale", shortType);
 132                         schemaTable.Columns.Add ("IsUnique", booleanType);
 133                         schemaTable.Columns.Add ("IsKey", booleanType);
 134                         schemaTable.Columns.Add ("BaseServerName", stringType);
 135                         schemaTable.Columns.Add ("BaseCatalogName", stringType);
 136                         schemaTable.Columns.Add ("BaseColumnName", stringType);
 137                         schemaTable.Columns.Add ("BaseSchemaName", stringType);
 138                         schemaTable.Columns.Add ("BaseTableName", stringType);
 139                         schemaTable.Columns.Add ("DataType", typeType);
 140                         schemaTable.Columns.Add ("AllowDBNull", booleanType);
 141                         schemaTable.Columns.Add ("ProviderType", intType);
 142                         schemaTable.Columns.Add ("IsAliased", booleanType);
 143                         schemaTable.Columns.Add ("IsExpression", booleanType);
 144                         schemaTable.Columns.Add ("IsIdentity", booleanType);
 145                         schemaTable.Columns.Add ("IsAutoIncrement", booleanType);
 146                         schemaTable.Columns.Add ("IsRowVersion", booleanType);
 147                         schemaTable.Columns.Add ("IsHidden", booleanType);
 148                         schemaTable.Columns.Add ("IsLong", booleanType);
 149                         schemaTable.Columns.Add ("IsReadOnly", booleanType);
 150
 151                         return schemaTable;
 152                 }
 153
 154                 private void Dispose (bool disposing)
 155                 {
 156                         if (!disposed) {
 157                                 if (disposing) {
 158                                         schemaTable.Dispose ();
 159                                         Close ();
 160                                 }
 161                                 disposed = true;
 162                         }
 163                 }
 164
 165                 public bool GetBoolean (int i)
 166                 {
 167                         object value = GetValue (i);
 168                         if (!(value is bool)) {
 169                                 if (value is DBNull) throw new SybaseNullValueException ();
 170                                 throw new InvalidCastException ();
 171                         }
 172                         return (bool) value;
 173                 }
 174
 175                 public byte GetByte (int i)
 176                 {
 177                         object value = GetValue (i);
 178                         if (!(value is byte)) {
 179                                 if (value is DBNull) throw new SybaseNullValueException ();
 180                                 throw new InvalidCastException ();
 181                         }
 182                         return (byte) value;
 183                 }
 184
 185                 public long GetBytes (int i, long dataIndex, byte[] buffer, int bufferIndex, int length)
 186                 {
 187                         object value = GetValue (i);
 188                         if (!(value is byte [])) {
 189                                 if (value is DBNull) throw new SybaseNullValueException ();
 190                                 throw new InvalidCastException ();
 191                         }
 192                         Array.Copy ((byte []) value, (int) dataIndex, buffer, bufferIndex, length);
 193                         return ((byte []) value).Length - dataIndex;
 194                 }
 195
 196                 public char GetChar (int i)
 197                 {
 198                         object value = GetValue (i);
 199                         if (!(value is char)) {
 200                                 if (value is DBNull) throw new SybaseNullValueException ();
 201                                 throw new InvalidCastException ();
 202                         }
 203                         return (char) value;
 204                 }
 205
 206                 public long GetChars (int i, long dataIndex, char[] buffer, int bufferIndex, int length)
 207                 {
 208                         object value = GetValue (i);
 209                         if (!(value is char[])) {
 210                                 if (value is DBNull) throw new SybaseNullValueException ();
 211                                 throw new InvalidCastException ();
 212                         }
 213                         Array.Copy ((char []) value, (int) dataIndex, buffer, bufferIndex, length);
 214                         return ((char []) value).Length - dataIndex;
 215                 }
 216
 217                 [MonoTODO ("Implement GetData")]
 218                 public IDataReader GetData (int i)
 219                 {
 220                         throw new NotImplementedException ();
 221                 }
 222
 223                 public string GetDataTypeName (int i)
 224                 {
 225                         return (string) dataTypeNames [i];
 226                 }
 227
 228                 public DateTime GetDateTime (int i)
 229                 {
 230                         object value = GetValue (i);
 231                         if (!(value is DateTime)) {
 232                                 if (value is DBNull) throw new SybaseNullValueException ();
 233                                 throw new InvalidCastException ();
 234                         }
 235                         return (DateTime) value;
 236                 }
 237
 238                 public decimal GetDecimal (int i)
 239                 {
 240                         object value = GetValue (i);
 241                         if (!(value is decimal)) {
 242                                 if (value is DBNull) throw new SybaseNullValueException ();
 243                                 throw new InvalidCastException ();
 244                         }
 245                         return (decimal) value;
 246                 }
 247
 248                 public double GetDouble (int i)
 249                 {
 250                         object value = GetValue (i);
 251                         if (!(value is double)) {
 252                                 if (value is DBNull) throw new SybaseNullValueException ();
 253                                 throw new InvalidCastException ();
 254                         }
 255                         return (double) value;
 256                 }
 257
 258                 public Type GetFieldType (int i)
 259                 {
 260                         return (Type) schemaTable.Rows[i]["DataType"];
 261                 }
 262
 263                 public float GetFloat (int i)
 264                 {
 265                         object value = GetValue (i);
 266                         if (!(value is float)) {
 267                                 if (value is DBNull) throw new SybaseNullValueException ();
 268                                 throw new InvalidCastException ();
 269                         }
 270                         return (float) value;
 271                 }
 272
 273                 public Guid GetGuid (int i)
 274                 {
 275                         object value = GetValue (i);
 276                         if (!(value is Guid)) {
 277                                 if (value is DBNull) throw new SybaseNullValueException ();
 278                                 throw new InvalidCastException ();
 279                         }
 280                         return (Guid) value;
 281                 }
 282
 283                 public short GetInt16 (int i)
 284                 {
 285                         object value = GetValue (i);
 286                         if (!(value is short)) {
 287                                 if (value is DBNull) throw new SybaseNullValueException ();
 288                                 throw new InvalidCastException ();
 289                         }
 290                         return (short) value;
 291                 }
 292
 293                 public int GetInt32 (int i)
 294                 {
 295                         object value = GetValue (i);
 296                         if (!(value is int)) {
 297                                 if (value is DBNull) throw new SybaseNullValueException ();
 298                                 throw new InvalidCastException ();
 299                         }
 300                         return (int) value;
 301                 }
 302
 303                 public long GetInt64 (int i)
 304                 {
 305                         object value = GetValue (i);
 306                         if (!(value is long)) {
 307                                 if (value is DBNull) throw new SybaseNullValueException ();
 308                                 throw new InvalidCastException ();
 309                         }
 310                         return (long) value;
 311                 }
 312
 313                 public string GetName (int i)
 314                 {
 315                         return (string) schemaTable.Rows[i]["ColumnName"];
 316                 }
 317
 318                 public int GetOrdinal (string name)
 319                 {
 320                         foreach (DataRow schemaRow in schemaTable.Rows)
 321                                 if (((string) schemaRow ["ColumnName"]).Equals (name))
 322                                         return (int) schemaRow ["ColumnOrdinal"];
 323                         foreach (DataRow schemaRow in schemaTable.Rows)
 324                                 if (String.Compare (((string) schemaRow ["ColumnName"]), name, true) == 0)
 325                                         return (int) schemaRow ["ColumnOrdinal"];
 326                         throw new IndexOutOfRangeException ();
 327                 }
 328
 329                 public DataTable GetSchemaTable ()
 330                 {
 331                         if (schemaTable.Rows != null && schemaTable.Rows.Count > 0)
 332                                 return schemaTable;
 333
 334                         if (!moreResults)
 335                                 return null;
 336
 337                         fieldCount = 0;
 338
 339                         dataTypeNames = new ArrayList ();
 340
 341                         foreach (TdsDataColumn schema in command.Tds.Columns) {
 342                                 DataRow row = schemaTable.NewRow ();
 343
 344                                 row ["ColumnName"]              = GetSchemaValue (schema, "ColumnName");
 345                                 row ["ColumnSize"]              = GetSchemaValue (schema, "ColumnSize");
 346                                 row ["ColumnOrdinal"]           = GetSchemaValue (schema, "ColumnOrdinal");
 347                                 row ["NumericPrecision"]        = GetSchemaValue (schema, "NumericPrecision");
 348                                 row ["NumericScale"]            = GetSchemaValue (schema, "NumericScale");
 349                                 row ["IsUnique"]                = GetSchemaValue (schema, "IsUnique");
 350                                 row ["IsKey"]                   = GetSchemaValue (schema, "IsKey");
 351                                 row ["BaseServerName"]          = GetSchemaValue (schema, "BaseServerName");
 352                                 row ["BaseCatalogName"]         = GetSchemaValue (schema, "BaseCatalogName");
 353                                 row ["BaseColumnName"]          = GetSchemaValue (schema, "BaseColumnName");
 354                                 row ["BaseSchemaName"]          = GetSchemaValue (schema, "BaseSchemaName");
 355                                 row ["BaseTableName"]           = GetSchemaValue (schema, "BaseTableName");
 356                                 row ["AllowDBNull"]             = GetSchemaValue (schema, "AllowDBNull");
 357                                 row ["IsAliased"]               = GetSchemaValue (schema, "IsAliased");
 358                                 row ["IsExpression"]            = GetSchemaValue (schema, "IsExpression");
 359                                 row ["IsIdentity"]              = GetSchemaValue (schema, "IsIdentity");
 360                                 row ["IsAutoIncrement"]         = GetSchemaValue (schema, "IsAutoIncrement");
 361                                 row ["IsRowVersion"]            = GetSchemaValue (schema, "IsRowVersion");
 362                                 row ["IsHidden"]                = GetSchemaValue (schema, "IsHidden");
 363                                 row ["IsReadOnly"]              = GetSchemaValue (schema, "IsReadOnly");
 364
 365                                 // We don't always get the base column name.
 366                                 if (row ["BaseColumnName"] == DBNull.Value)
 367                                         row ["BaseColumnName"] = row ["ColumnName"];
 368
 369                                 switch ((TdsColumnType) schema ["ColumnType"]) {
 370                                         case TdsColumnType.Image :
 371                                                 dataTypeNames.Add ("image");
 372                                                 row ["ProviderType"] = (int) SybaseType.Image;
 373                                                 row ["DataType"] = typeof (byte[]);
 374                                                 row ["IsLong"] = true;
 375                                                 break;
 376                                         case TdsColumnType.Text :
 377                                                 dataTypeNames.Add ("text");
 378                                                 row ["ProviderType"] = (int) SybaseType.Text;
 379                                                 row ["DataType"] = typeof (string);
 380                                                 row ["IsLong"] = true;
 381                                                 break;
 382                                         case TdsColumnType.UniqueIdentifier :
 383                                                 dataTypeNames.Add ("uniqueidentifier");
 384                                                 row ["ProviderType"] = (int) SybaseType.UniqueIdentifier;
 385                                                 row ["DataType"] = typeof (Guid);
 386                                                 row ["IsLong"] = false;
 387                                                 break;
 388                                         case TdsColumnType.VarBinary :
 389                                         case TdsColumnType.BigVarBinary :
 390                                                 dataTypeNames.Add ("varbinary");
 391                                                 row ["ProviderType"] = (int) SybaseType.VarBinary;
 392                                                 row ["DataType"] = typeof (byte[]);
 393                                                 row ["IsLong"] = true;
 394                                                 break;
 395                                         case TdsColumnType.IntN :
 396                                         case TdsColumnType.Int4 :
 397                                                 dataTypeNames.Add ("int");
 398                                                 row ["ProviderType"] = (int) SybaseType.Int;
 399                                                 row ["DataType"] = typeof (int);
 400                                                 row ["IsLong"] = false;
 401                                                 break;
 402                                         case TdsColumnType.VarChar :
 403                                         case TdsColumnType.BigVarChar :
 404                                                 dataTypeNames.Add ("varchar");
 405                                                 row ["ProviderType"] = (int) SybaseType.VarChar;
 406                                                 row ["DataType"] = typeof (string);
 407                                                 row ["IsLong"] = false;
 408                                                 break;
 409                                         case TdsColumnType.Binary :
 410                                         case TdsColumnType.BigBinary :
 411                                                 dataTypeNames.Add ("binary");
 412                                                 row ["ProviderType"] = (int) SybaseType.Binary;
 413                                                 row ["DataType"] = typeof (byte[]);
 414                                                 row ["IsLong"] = true;
 415                                                 break;
 416                                         case TdsColumnType.Char :
 417                                         case TdsColumnType.BigChar :
 418                                                 dataTypeNames.Add ("char");
 419                                                 row ["ProviderType"] = (int) SybaseType.Char;
 420                                                 row ["DataType"] = typeof (string);
 421                                                 row ["IsLong"] = false;
 422                                                 break;
 423                                         case TdsColumnType.Int1 :
 424                                                 dataTypeNames.Add ("tinyint");
 425                                                 row ["ProviderType"] = (int) SybaseType.TinyInt;
 426                                                 row ["DataType"] = typeof (byte);
 427                                                 row ["IsLong"] = false;
 428                                                 break;
 429                                         case TdsColumnType.Bit :
 430                                         case TdsColumnType.BitN :
 431                                                 dataTypeNames.Add ("bit");
 432                                                 row ["ProviderType"] = (int) SybaseType.Bit;
 433                                                 row ["DataType"] = typeof (bool);
 434                                                 row ["IsLong"] = false;
 435                                                 break;
 436                                         case TdsColumnType.Int2 :
 437                                                 dataTypeNames.Add ("smallint");
 438                                                 row ["ProviderType"] = (int) SybaseType.SmallInt;
 439                                                 row ["DataType"] = typeof (short);
 440                                                 row ["IsLong"] = false;
 441                                                 break;
 442                                         case TdsColumnType.DateTime4 :
 443                                         case TdsColumnType.DateTime :
 444                                         case TdsColumnType.DateTimeN :
 445                                                 dataTypeNames.Add ("datetime");
 446                                                 row ["ProviderType"] = (int) SybaseType.DateTime;
 447                                                 row ["DataType"] = typeof (DateTime);
 448                                                 row ["IsLong"] = false;
 449                                                 break;
 450                                         case TdsColumnType.Real :
 451                                                 dataTypeNames.Add ("real");
 452                                                 row ["ProviderType"] = (int) SybaseType.Real;
 453                                                 row ["DataType"] = typeof (float);
 454                                                 break;
 455                                         case TdsColumnType.Money :
 456                                         case TdsColumnType.MoneyN :
 457                                         case TdsColumnType.Money4 :
 458                                                 dataTypeNames.Add ("money");
 459                                                 row ["ProviderType"] = (int) SybaseType.Money;
 460                                                 row ["DataType"] = typeof (decimal);
 461                                                 row ["IsLong"] = false;
 462                                                 break;
 463                                         case TdsColumnType.Float8 :
 464                                         case TdsColumnType.FloatN :
 465                                                 dataTypeNames.Add ("float");
 466                                                 row ["ProviderType"] = (int) SybaseType.Float;
 467                                                 row ["DataType"] = typeof (double);
 468                                                 row ["IsLong"] = false;
 469                                                 break;
 470                                         case TdsColumnType.NText :
 471                                                 dataTypeNames.Add ("ntext");
 472                                                 row ["ProviderType"] = (int) SybaseType.NText;
 473                                                 row ["DataType"] = typeof (string);
 474                                                 row ["IsLong"] = true;
 475                                                 break;
 476                                         case TdsColumnType.NVarChar :
 477                                                 dataTypeNames.Add ("nvarchar");
 478                                                 row ["ProviderType"] = (int) SybaseType.NVarChar;
 479                                                 row ["DataType"] = typeof (string);
 480                                                 row ["IsLong"] = false;
 481                                                 break;
 482                                         case TdsColumnType.Decimal :
 483                                         case TdsColumnType.Numeric :
 484                                                 dataTypeNames.Add ("decimal");
 485                                                 row ["ProviderType"] = (int) SybaseType.Decimal;
 486                                                 row ["DataType"] = typeof (decimal);
 487                                                 row ["IsLong"] = false;
 488                                                 break;
 489                                         case TdsColumnType.NChar :
 490                                                 dataTypeNames.Add ("nchar");
 491                                                 row ["ProviderType"] = (int) SybaseType.NChar;
 492                                                 row ["DataType"] = typeof (string);
 493                                                 row ["IsLong"] = false;
 494                                                 break;
 495                                         case TdsColumnType.SmallMoney :
 496                                                 dataTypeNames.Add ("smallmoney");
 497                                                 row ["ProviderType"] = (int) SybaseType.SmallMoney;
 498                                                 row ["DataType"] = typeof (decimal);
 499                                                 row ["IsLong"] = false;
 500                                                 break;
 501                                         default :
 502                                                 dataTypeNames.Add ("variant");
 503                                                 row ["ProviderType"] = (int) SybaseType.Variant;
 504                                                 row ["DataType"] = typeof (object);
 505                                                 row ["IsLong"] = false;
 506                                                 break;
 507                                 }
 508
 509                                 schemaTable.Rows.Add (row);
 510
 511                                 fieldCount += 1;
 512                         }
 513                         return schemaTable;
 514                 }
 515
 516                 private static object GetSchemaValue (TdsDataColumn schema, object key)
 517                 {
 518                         if (schema.ContainsKey (key) && schema [key] != null)
 519                                 return schema [key];
 520                         return DBNull.Value;
 521                 }
 522
 523                 public SybaseBinary GetSybaseBinary (int i)
 524                 {
 525                         throw new NotImplementedException ();
 526                 }
 527
 528                 public SybaseBoolean GetSybaseBoolean (int i)
 529                 {
 530                         object value = GetSybaseValue (i);
 531                         if (!(value is SybaseBoolean))
 532                                 throw new InvalidCastException ();
 533                         return (SybaseBoolean) value;
 534                 }
 535
 536                 public SybaseByte GetSybaseByte (int i)
 537                 {
 538                         object value = GetSybaseValue (i);
 539                         if (!(value is SybaseByte))
 540                                 throw new InvalidCastException ();
 541                         return (SybaseByte) value;
 542                 }
 543
 544                 public SybaseDateTime GetSybaseDateTime (int i)
 545                 {
 546                         object value = GetSybaseValue (i);
 547                         if (!(value is SybaseDateTime))
 548                                 throw new InvalidCastException ();
 549                         return (SybaseDateTime) value;
 550                 }
 551
 552                 public SybaseDecimal GetSybaseDecimal (int i)
 553                 {
 554                         object value = GetSybaseValue (i);
 555                         if (!(value is SybaseDecimal))
 556                                 throw new InvalidCastException ();
 557                         return (SybaseDecimal) value;
 558                 }
 559
 560                 public SybaseDouble GetSybaseDouble (int i)
 561                 {
 562                         object value = GetSybaseValue (i);
 563                         if (!(value is SybaseDouble))
 564                                 throw new InvalidCastException ();
 565                         return (SybaseDouble) value;
 566                 }
 567
 568                 public SybaseGuid GetSybaseGuid (int i)
 569                 {
 570                         object value = GetSybaseValue (i);
 571                         if (!(value is SybaseGuid))
 572                                 throw new InvalidCastException ();
 573                         return (SybaseGuid) value;
 574                 }
 575
 576                 public SybaseInt16 GetSybaseInt16 (int i)
 577                 {
 578                         object value = GetSybaseValue (i);
 579                         if (!(value is SybaseInt16))
 580                                 throw new InvalidCastException ();
 581                         return (SybaseInt16) value;
 582                 }
 583
 584                 public SybaseInt32 GetSybaseInt32 (int i)
 585                 {
 586                         object value = GetSybaseValue (i);
 587                         if (!(value is SybaseInt32))
 588                                 throw new InvalidCastException ();
 589                         return (SybaseInt32) value;
 590                 }
 591
 592                 public SybaseInt64 GetSybaseInt64 (int i)
 593                 {
 594                         object value = GetSybaseValue (i);
 595                         if (!(value is SybaseInt64))
 596                                 throw new InvalidCastException ();
 597                         return (SybaseInt64) value;
 598                 }
 599
 600                 public SybaseMoney GetSybaseMoney (int i)
 601                 {
 602                         object value = GetSybaseValue (i);
 603                         if (!(value is SybaseMoney))
 604                                 throw new InvalidCastException ();
 605                         return (SybaseMoney) value;
 606                 }
 607
 608                 public SybaseSingle GetSybaseSingle (int i)
 609                 {
 610                         object value = GetSybaseValue (i);
 611                         if (!(value is SybaseSingle))
 612                                 throw new InvalidCastException ();
 613                         return (SybaseSingle) value;
 614                 }
 615
 616                 public SybaseString GetSybaseString (int i)
 617                 {
 618                         object value = GetSybaseValue (i);
 619                         if (!(value is SybaseString))
 620                                 throw new InvalidCastException ();
 621                         return (SybaseString) value;
 622                 }
 623
 624                 [MonoTODO ("Implement TdsBigDecimal conversion.  SybaseType.Real fails tests?")]
 625                 public object GetSybaseValue (int i)
 626                 {
 627                         SybaseType type = (SybaseType) (schemaTable.Rows [i]["ProviderType"]);
 628                         object value = GetValue (i);
 629
 630                         switch (type) {
 631                         case SybaseType.BigInt:
 632                                 if (value == DBNull.Value)
 633                                         return SybaseInt64.Null;
 634                                 return (SybaseInt64) ((long) value);
 635                         case SybaseType.Binary:
 636                         case SybaseType.Image:
 637                         case SybaseType.VarBinary:
 638                         case SybaseType.Timestamp:
 639                                 if (value == DBNull.Value)
 640                                         return SybaseBinary.Null;
 641                                 return (SybaseBinary) ((byte[]) value);
 642                         case SybaseType.Bit:
 643                                 if (value == DBNull.Value)
 644                                         return SybaseBoolean.Null;
 645                                 return (SybaseBoolean) ((bool) value);
 646                         case SybaseType.Char:
 647                         case SybaseType.NChar:
 648                         case SybaseType.NText:
 649                         case SybaseType.NVarChar:
 650                         case SybaseType.Text:
 651                         case SybaseType.VarChar:
 652                                 if (value == DBNull.Value)
 653                                         return SybaseString.Null;
 654                                 return (SybaseString) ((string) value);
 655                         case SybaseType.DateTime:
 656                         case SybaseType.SmallDateTime:
 657                                 if (value == DBNull.Value)
 658                                         return SybaseDateTime.Null;
 659                                 return (SybaseDateTime) ((DateTime) value);
 660                         case SybaseType.Decimal:
 661                                 if (value == DBNull.Value)
 662                                         return SybaseDecimal.Null;
 663                                 if (value is TdsBigDecimal)
 664                                         return SybaseDecimal.FromTdsBigDecimal ((TdsBigDecimal) value);
 665                                 return (SybaseDecimal) ((decimal) value);
 666                         case SybaseType.Float:
 667                                 if (value == DBNull.Value)
 668                                         return SybaseDouble.Null;
 669                                 return (SybaseDouble) ((double) value);
 670                         case SybaseType.Int:
 671                                 if (value == DBNull.Value)
 672                                         return SybaseInt32.Null;
 673                                 return (SybaseInt32) ((int) value);
 674                         case SybaseType.Money:
 675                         case SybaseType.SmallMoney:
 676                                 if (value == DBNull.Value)
 677                                         return SybaseMoney.Null;
 678                                 return (SybaseMoney) ((decimal) value);
 679                         case SybaseType.Real:
 680                                 if (value == DBNull.Value)
 681                                         return SybaseSingle.Null;
 682                                 return (SybaseSingle) ((float) value);
 683                         case SybaseType.UniqueIdentifier:
 684                                 if (value == DBNull.Value)
 685                                         return SybaseGuid.Null;
 686                                 return (SybaseGuid) ((Guid) value);
 687                         case SybaseType.SmallInt:
 688                                 if (value == DBNull.Value)
 689                                         return SybaseInt16.Null;
 690                                 return (SybaseInt16) ((short) value);
 691                         case SybaseType.TinyInt:
 692                                 if (value == DBNull.Value)
 693                                         return SybaseByte.Null;
 694                                 return (SybaseByte) ((byte) value);
 695                         }
 696
 697                         throw new InvalidOperationException ("The type of this column is unknown.");
 698                 }
 699
 700                 public int GetSybaseValues (object[] values)
 701                 {
 702                         int count = 0;
 703                         int columnCount = schemaTable.Rows.Count;
 704                         int arrayCount = values.Length;
 705
 706                         if (arrayCount > columnCount)
 707                                 count = columnCount;
 708                         else
 709                                 count = arrayCount;
 710
 711                         for (int i = 0; i < count; i += 1)
 712                                 values [i] = GetSybaseValue (i);
 713
 714                         return count;
 715                 }
 716
 717                 public string GetString (int i)
 718                 {
 719                         object value = GetValue (i);
 720                         if (!(value is string)) {
 721                                 if (value is DBNull) throw new SybaseNullValueException ();
 722                                 throw new InvalidCastException ();
 723                         }
 724                         return (string) value;
 725                 }
 726
 727                 public object GetValue (int i)
 728                 {
 729                         return command.Tds.ColumnValues [i];
 730                 }
 731
 732                 public int GetValues (object[] values)
 733                 {
 734                         int len = values.Length;
 735                         int bigDecimalIndex = command.Tds.ColumnValues.BigDecimalIndex;
 736
 737                         // If a four-byte decimal is stored, then we can't convert to
 738                         // a native type.  Throw an OverflowException.
 739                         if (bigDecimalIndex >= 0 && bigDecimalIndex < len)
 740                                 throw new OverflowException ();
 741
 742                         command.Tds.ColumnValues.CopyTo (0, values, 0, len);
 743                         return (len > FieldCount ? len : FieldCount);
 744                 }
 745
 746                 void IDisposable.Dispose ()
 747                 {
 748                         Dispose (true);
 749                         GC.SuppressFinalize (this);
 750                 }
 751
 752                 IEnumerator IEnumerable.GetEnumerator ()
 753                 {
 754                         return new DbEnumerator (this);
 755                 }
 756
 757                 public bool IsDBNull (int i)
 758                 {
 759                         return GetValue (i) == DBNull.Value;
 760                 }
 761
 762                 public bool NextResult ()
 763                 {
 764                         if ((command.CommandBehavior & CommandBehavior.SingleResult) != 0 && resultsRead > 0)
 765                                 return false;
 766                         if (command.Tds.DoneProc)
 767                                 return false;
 768
 769                         schemaTable.Rows.Clear ();
 770
 771                         moreResults = command.Tds.NextResult ();
 772                         GetSchemaTable ();
 773
 774                         rowsRead = 0;
 775                         resultsRead += 1;
 776                         return moreResults;
 777                 }
 778
 779                 public bool Read ()
 780                 {
 781                         if ((command.CommandBehavior & CommandBehavior.SingleRow) != 0 && rowsRead > 0)
 782                                 return false;
 783                         if ((command.CommandBehavior & CommandBehavior.SchemaOnly) != 0)
 784                                 return false;
 785                         if (!moreResults)
 786                                 return false;
 787
 788                         bool result = command.Tds.NextRow ();
 789
 790                         rowsRead += 1;
 791
 792                         return result;
 793                 }
 794
 795                 #endregion // Methods
 796         }
 797 }