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Source: /admin/includes/php/adodb/drivers/adodb-odbc.inc.php - 738 lines - 19508 bytes - Summary - Text - Print

   1  <?php
   2  /* 
   3  V4.98 13 Feb 2008  (c) 2000-2008 John Lim (jlim#natsoft.com.my). All rights reserved.
   4    Released under both BSD license and Lesser GPL library license. 
   5    Whenever there is any discrepancy between the two licenses, 
   6    the BSD license will take precedence. 
   7  Set tabs to 4 for best viewing.
   8    
   9    Latest version is available at http://adodb.sourceforge.net
  10    
  11    Requires ODBC. Works on Windows and Unix.
  12  */
  13  // security - hide paths
  14  if (!defined('ADODB_DIR')) die();
  15  
  16    define("_ADODB_ODBC_LAYER", 2 );
  17       
  18  /*--------------------------------------------------------------------------------------
  19  --------------------------------------------------------------------------------------*/
  20  
  21  
  22  class ADODB_odbc extends ADOConnection {
  23      var $databaseType = "odbc";    
  24      var $fmtDate = "'Y-m-d'";
  25      var $fmtTimeStamp = "'Y-m-d, h:i:sA'";
  26      var $replaceQuote = "''"; // string to use to replace quotes
  27      var $dataProvider = "odbc";
  28      var $hasAffectedRows = true;
  29      var $binmode = ODBC_BINMODE_RETURN;
  30      var $useFetchArray = false; // setting this to true will make array elements in FETCH_ASSOC mode case-sensitive
  31                                  // breaking backward-compat
  32      //var $longreadlen = 8000; // default number of chars to return for a Blob/Long field
  33      var $_bindInputArray = false;    
  34      var $curmode = SQL_CUR_USE_DRIVER; // See sqlext.h, SQL_CUR_DEFAULT == SQL_CUR_USE_DRIVER == 2L
  35      var $_genSeqSQL = "create table %s (id integer)";
  36      var $_autocommit = true;
  37      var $_haserrorfunctions = true;
  38      var $_has_stupid_odbc_fetch_api_change = true;
  39      var $_lastAffectedRows = 0;
  40      var $uCaseTables = true; // for meta* functions, uppercase table names
  41      
  42  	function ADODB_odbc() 
  43      {     
  44          $this->_haserrorfunctions = ADODB_PHPVER >= 0x4050;
  45          $this->_has_stupid_odbc_fetch_api_change = ADODB_PHPVER >= 0x4200;
  46      }
  47      
  48          // returns true or false
  49  	function _connect($argDSN, $argUsername, $argPassword, $argDatabasename)
  50      {
  51      global $php_errormsg;
  52          
  53          if (!function_exists('odbc_connect')) return null;
  54          
  55          if ($this->debug && $argDatabasename && $this->databaseType != 'vfp') {
  56              ADOConnection::outp("For odbc Connect(), $argDatabasename is not used. Place dsn in 1st parameter.");
  57          }
  58          if (isset($php_errormsg)) $php_errormsg = '';
  59          if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);
  60          else $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword,$this->curmode);
  61          $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
  62          if (isset($this->connectStmt)) $this->Execute($this->connectStmt);
  63          
  64          return $this->_connectionID != false;
  65      }
  66      
  67      // returns true or false
  68  	function _pconnect($argDSN, $argUsername, $argPassword, $argDatabasename)
  69      {
  70      global $php_errormsg;
  71      
  72          if (!function_exists('odbc_connect')) return null;
  73          
  74          if (isset($php_errormsg)) $php_errormsg = '';
  75          $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
  76          if ($this->debug && $argDatabasename) {
  77              ADOConnection::outp("For odbc PConnect(), $argDatabasename is not used. Place dsn in 1st parameter.");
  78          }
  79      //    print "dsn=$argDSN u=$argUsername p=$argPassword<br>"; flush();
  80          if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);
  81          else $this->_connectionID = odbc_pconnect($argDSN,$argUsername,$argPassword,$this->curmode);
  82          
  83          $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
  84          if ($this->_connectionID && $this->autoRollback) @odbc_rollback($this->_connectionID);
  85          if (isset($this->connectStmt)) $this->Execute($this->connectStmt);
  86          
  87          return $this->_connectionID != false;
  88      }
  89  
  90      
  91  	function ServerInfo()
  92      {
  93      
  94          if (!empty($this->host) && ADODB_PHPVER >= 0x4300) {
  95              $dsn = strtoupper($this->host);
  96              $first = true;
  97              $found = false;
  98              
  99              if (!function_exists('odbc_data_source')) return false;
 100              
 101              while(true) {
 102                  
 103                  $rez = @odbc_data_source($this->_connectionID,
 104                      $first ? SQL_FETCH_FIRST : SQL_FETCH_NEXT);
 105                  $first = false;
 106                  if (!is_array($rez)) break;
 107                  if (strtoupper($rez['server']) == $dsn) {
 108                      $found = true;
 109                      break;
 110                  }
 111              } 
 112              if (!$found) return ADOConnection::ServerInfo();
 113              if (!isset($rez['version'])) $rez['version'] = '';
 114              return $rez;
 115          } else {
 116              return ADOConnection::ServerInfo();
 117          }
 118      }
 119  
 120      
 121  	function CreateSequence($seqname='adodbseq',$start=1)
 122      {
 123          if (empty($this->_genSeqSQL)) return false;
 124          $ok = $this->Execute(sprintf($this->_genSeqSQL,$seqname));
 125          if (!$ok) return false;
 126          $start -= 1;
 127          return $this->Execute("insert into $seqname values($start)");
 128      }
 129      
 130      var $_dropSeqSQL = 'drop table %s';
 131  	function DropSequence($seqname)
 132      {
 133          if (empty($this->_dropSeqSQL)) return false;
 134          return $this->Execute(sprintf($this->_dropSeqSQL,$seqname));
 135      }
 136      
 137      /*
 138          This algorithm is not very efficient, but works even if table locking
 139          is not available.
 140          
 141          Will return false if unable to generate an ID after $MAXLOOPS attempts.
 142      */
 143  	function GenID($seq='adodbseq',$start=1)
 144      {    
 145          // if you have to modify the parameter below, your database is overloaded,
 146          // or you need to implement generation of id's yourself!
 147          $MAXLOOPS = 100;
 148          //$this->debug=1;
 149          while (--$MAXLOOPS>=0) {
 150              $num = $this->GetOne("select id from $seq");
 151              if ($num === false) {
 152                  $this->Execute(sprintf($this->_genSeqSQL ,$seq));    
 153                  $start -= 1;
 154                  $num = '0';
 155                  $ok = $this->Execute("insert into $seq values($start)");
 156                  if (!$ok) return false;
 157              } 
 158              $this->Execute("update $seq set id=id+1 where id=$num");
 159              
 160              if ($this->affected_rows() > 0) {
 161                  $num += 1;
 162                  $this->genID = $num;
 163                  return $num;
 164              }
 165          }
 166          if ($fn = $this->raiseErrorFn) {
 167              $fn($this->databaseType,'GENID',-32000,"Unable to generate unique id after $MAXLOOPS attempts",$seq,$num);
 168          }
 169          return false;
 170      }
 171  
 172  
 173  	function ErrorMsg()
 174      {
 175          if ($this->_haserrorfunctions) {
 176              if ($this->_errorMsg !== false) return $this->_errorMsg;
 177              if (empty($this->_connectionID)) return @odbc_errormsg();
 178              return @odbc_errormsg($this->_connectionID);
 179          } else return ADOConnection::ErrorMsg();
 180      }
 181      
 182  	function ErrorNo()
 183      {
 184          
 185          if ($this->_haserrorfunctions) {
 186              if ($this->_errorCode !== false) {
 187                  // bug in 4.0.6, error number can be corrupted string (should be 6 digits)
 188                  return (strlen($this->_errorCode)<=2) ? 0 : $this->_errorCode;
 189              }
 190  
 191              if (empty($this->_connectionID)) $e = @odbc_error(); 
 192              else $e = @odbc_error($this->_connectionID);
 193              
 194               // bug in 4.0.6, error number can be corrupted string (should be 6 digits)
 195               // so we check and patch
 196              if (strlen($e)<=2) return 0;
 197              return $e;
 198          } else return ADOConnection::ErrorNo();
 199      }
 200      
 201      
 202  
 203  	function BeginTrans()
 204      {    
 205          if (!$this->hasTransactions) return false;
 206          if ($this->transOff) return true; 
 207          $this->transCnt += 1;
 208          $this->_autocommit = false;
 209          return odbc_autocommit($this->_connectionID,false);
 210      }
 211      
 212  	function CommitTrans($ok=true) 
 213      { 
 214          if ($this->transOff) return true; 
 215          if (!$ok) return $this->RollbackTrans();
 216          if ($this->transCnt) $this->transCnt -= 1;
 217          $this->_autocommit = true;
 218          $ret = odbc_commit($this->_connectionID);
 219          odbc_autocommit($this->_connectionID,true);
 220          return $ret;
 221      }
 222      
 223  	function RollbackTrans()
 224      {
 225          if ($this->transOff) return true; 
 226          if ($this->transCnt) $this->transCnt -= 1;
 227          $this->_autocommit = true;
 228          $ret = odbc_rollback($this->_connectionID);
 229          odbc_autocommit($this->_connectionID,true);
 230          return $ret;
 231      }
 232      
 233  	function MetaPrimaryKeys($table)
 234      {
 235      global $ADODB_FETCH_MODE;
 236      
 237          if ($this->uCaseTables) $table = strtoupper($table);
 238          $schema = '';
 239          $this->_findschema($table,$schema);
 240  
 241          $savem = $ADODB_FETCH_MODE;
 242          $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
 243          $qid = @odbc_primarykeys($this->_connectionID,'',$schema,$table);
 244          
 245          if (!$qid) {
 246              $ADODB_FETCH_MODE = $savem;
 247              return false;
 248          }
 249          $rs = new ADORecordSet_odbc($qid);
 250          $ADODB_FETCH_MODE = $savem;
 251          
 252          if (!$rs) return false;
 253          $rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;
 254          
 255          $arr =& $rs->GetArray();
 256          $rs->Close();
 257          //print_r($arr);
 258          $arr2 = array();
 259          for ($i=0; $i < sizeof($arr); $i++) {
 260              if ($arr[$i][3]) $arr2[] = $arr[$i][3];
 261          }
 262          return $arr2;
 263      }
 264      
 265      
 266      
 267      function &MetaTables($ttype=false)
 268      {
 269      global $ADODB_FETCH_MODE;
 270      
 271          $savem = $ADODB_FETCH_MODE;
 272          $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
 273          $qid = odbc_tables($this->_connectionID);
 274          
 275          $rs = new ADORecordSet_odbc($qid);
 276          
 277          $ADODB_FETCH_MODE = $savem;
 278          if (!$rs) {
 279              $false = false;
 280              return $false;
 281          }
 282          $rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;
 283          
 284          $arr =& $rs->GetArray();
 285          //print_r($arr);
 286          
 287          $rs->Close();
 288          $arr2 = array();
 289          
 290          if ($ttype) {
 291              $isview = strncmp($ttype,'V',1) === 0;
 292          }
 293          for ($i=0; $i < sizeof($arr); $i++) {
 294              if (!$arr[$i][2]) continue;
 295              $type = $arr[$i][3];
 296              if ($ttype) { 
 297                  if ($isview) {
 298                      if (strncmp($type,'V',1) === 0) $arr2[] = $arr[$i][2];
 299                  } else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];
 300              } else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];
 301          }
 302          return $arr2;
 303      }
 304      
 305  /*
 306  See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odbc/htm/odbcdatetime_data_type_changes.asp
 307  / SQL data type codes /
 308  #define    SQL_UNKNOWN_TYPE    0
 309  #define SQL_CHAR            1
 310  #define SQL_NUMERIC         2
 311  #define SQL_DECIMAL         3
 312  #define SQL_INTEGER         4
 313  #define SQL_SMALLINT        5
 314  #define SQL_FLOAT           6
 315  #define SQL_REAL            7
 316  #define SQL_DOUBLE          8
 317  #if (ODBCVER >= 0x0300)
 318  #define SQL_DATETIME        9
 319  #endif
 320  #define SQL_VARCHAR        12
 321  
 322  
 323  / One-parameter shortcuts for date/time data types /
 324  #if (ODBCVER >= 0x0300)
 325  #define SQL_TYPE_DATE      91
 326  #define SQL_TYPE_TIME      92
 327  #define SQL_TYPE_TIMESTAMP 93
 328  
 329  #define SQL_UNICODE                             (-95)
 330  #define SQL_UNICODE_VARCHAR                     (-96)
 331  #define SQL_UNICODE_LONGVARCHAR                 (-97)
 332  */
 333  	function ODBCTypes($t)
 334      {
 335          switch ((integer)$t) {
 336          case 1:    
 337          case 12:
 338          case 0:
 339          case -95:
 340          case -96:
 341              return 'C';
 342          case -97:
 343          case -1: //text
 344              return 'X';
 345          case -4: //image
 346              return 'B';
 347                  
 348          case 9:    
 349          case 91:
 350              return 'D';
 351          
 352          case 10:
 353          case 11:
 354          case 92:
 355          case 93:
 356              return 'T';
 357              
 358          case 4:
 359          case 5:
 360          case -6:
 361              return 'I';
 362              
 363          case -11: // uniqidentifier
 364              return 'R';
 365          case -7: //bit
 366              return 'L';
 367          
 368          default:
 369              return 'N';
 370          }
 371      }
 372      
 373      function &MetaColumns($table)
 374      {
 375      global $ADODB_FETCH_MODE;
 376      
 377          $false = false;
 378          if ($this->uCaseTables) $table = strtoupper($table);
 379          $schema = '';
 380          $this->_findschema($table,$schema);
 381          
 382          $savem = $ADODB_FETCH_MODE;
 383          $ADODB_FETCH_MODE = ADODB_FETCH_NUM;
 384      
 385          /*if (false) { // after testing, confirmed that the following does not work becoz of a bug
 386              $qid2 = odbc_tables($this->_connectionID);
 387              $rs = new ADORecordSet_odbc($qid2);        
 388              $ADODB_FETCH_MODE = $savem;
 389              if (!$rs) return false;
 390              $rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;
 391              $rs->_fetch();
 392              
 393              while (!$rs->EOF) {
 394                  if ($table == strtoupper($rs->fields[2])) {
 395                      $q = $rs->fields[0];
 396                      $o = $rs->fields[1];
 397                      break;
 398                  }
 399                  $rs->MoveNext();
 400              }
 401              $rs->Close();
 402              
 403              $qid = odbc_columns($this->_connectionID,$q,$o,strtoupper($table),'%');
 404          } */
 405          
 406          switch ($this->databaseType) {
 407          case 'access':
 408          case 'vfp':
 409              $qid = odbc_columns($this->_connectionID);#,'%','',strtoupper($table),'%');
 410              break;
 411          
 412          
 413          case 'db2':
 414              $colname = "%";
 415              $qid = odbc_columns($this->_connectionID, "", $schema, $table, $colname);
 416              break;
 417              
 418          default:
 419              $qid = @odbc_columns($this->_connectionID,'%','%',strtoupper($table),'%');
 420              if (empty($qid)) $qid = odbc_columns($this->_connectionID);
 421              break;
 422          }
 423          if (empty($qid)) return $false;
 424          
 425          $rs =& new ADORecordSet_odbc($qid);
 426          $ADODB_FETCH_MODE = $savem;
 427          
 428          if (!$rs) return $false;
 429          $rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;
 430          $rs->_fetch();
 431          
 432          $retarr = array();
 433          
 434          /*
 435          $rs->fields indices
 436          0 TABLE_QUALIFIER
 437          1 TABLE_SCHEM
 438          2 TABLE_NAME
 439          3 COLUMN_NAME
 440          4 DATA_TYPE
 441          5 TYPE_NAME
 442          6 PRECISION
 443          7 LENGTH
 444          8 SCALE
 445          9 RADIX
 446          10 NULLABLE
 447          11 REMARKS
 448          */
 449          while (!$rs->EOF) {
 450          //    adodb_pr($rs->fields);
 451              if (strtoupper(trim($rs->fields[2])) == $table && (!$schema || strtoupper($rs->fields[1]) == $schema)) {
 452                  $fld = new ADOFieldObject();
 453                  $fld->name = $rs->fields[3];
 454                  $fld->type = $this->ODBCTypes($rs->fields[4]);
 455                  
 456                  // ref: http://msdn.microsoft.com/library/default.asp?url=/archive/en-us/dnaraccgen/html/msdn_odk.asp
 457                  // access uses precision to store length for char/varchar
 458                  if ($fld->type == 'C' or $fld->type == 'X') {
 459                      if ($this->databaseType == 'access') 
 460                          $fld->max_length = $rs->fields[6];
 461                      else if ($rs->fields[4] <= -95) // UNICODE
 462                          $fld->max_length = $rs->fields[7]/2;
 463                      else
 464                          $fld->max_length = $rs->fields[7];
 465                  } else 
 466                      $fld->max_length = $rs->fields[7];
 467                  $fld->not_null = !empty($rs->fields[10]);
 468                  $fld->scale = $rs->fields[8];
 469                  $retarr[strtoupper($fld->name)] = $fld;    
 470              } else if (sizeof($retarr)>0)
 471                  break;
 472              $rs->MoveNext();
 473          }
 474          $rs->Close(); //-- crashes 4.03pl1 -- why?
 475          
 476          if (empty($retarr)) $retarr = false;
 477          return $retarr;
 478      }
 479      
 480  	function Prepare($sql)
 481      {
 482          if (! $this->_bindInputArray) return $sql; // no binding
 483          $stmt = odbc_prepare($this->_connectionID,$sql);
 484          if (!$stmt) {
 485              // we don't know whether odbc driver is parsing prepared stmts, so just return sql
 486              return $sql;
 487          }
 488          return array($sql,$stmt,false);
 489      }
 490  
 491      /* returns queryID or false */
 492  	function _query($sql,$inputarr=false) 
 493      {
 494      GLOBAL $php_errormsg;
 495          if (isset($php_errormsg)) $php_errormsg = '';
 496          $this->_error = '';
 497          
 498          if ($inputarr) {
 499              if (is_array($sql)) {
 500                  $stmtid = $sql[1];
 501              } else {
 502                  $stmtid = odbc_prepare($this->_connectionID,$sql);
 503      
 504                  if ($stmtid == false) {
 505                      $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
 506                      return false;
 507                  }
 508              }
 509              
 510              if (! odbc_execute($stmtid,$inputarr)) {
 511                  //@odbc_free_result($stmtid);
 512                  if ($this->_haserrorfunctions) {
 513                      $this->_errorMsg = odbc_errormsg();
 514                      $this->_errorCode = odbc_error();
 515                  }
 516                  return false;
 517              }
 518          
 519          } else if (is_array($sql)) {
 520              $stmtid = $sql[1];
 521              if (!odbc_execute($stmtid)) {
 522                  //@odbc_free_result($stmtid);
 523                  if ($this->_haserrorfunctions) {
 524                      $this->_errorMsg = odbc_errormsg();
 525                      $this->_errorCode = odbc_error();
 526                  }
 527                  return false;
 528              }
 529          } else
 530              $stmtid = odbc_exec($this->_connectionID,$sql);
 531          
 532          $this->_lastAffectedRows = 0;
 533          if ($stmtid) {
 534              if (@odbc_num_fields($stmtid) == 0) {
 535                  $this->_lastAffectedRows = odbc_num_rows($stmtid);
 536                  $stmtid = true;
 537              } else {
 538                  $this->_lastAffectedRows = 0;
 539                  odbc_binmode($stmtid,$this->binmode);
 540                  odbc_longreadlen($stmtid,$this->maxblobsize);
 541              }
 542              
 543              if ($this->_haserrorfunctions) {
 544                  $this->_errorMsg = '';
 545                  $this->_errorCode = 0;
 546              } else
 547                  $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
 548          } else {
 549              if ($this->_haserrorfunctions) {
 550                  $this->_errorMsg = odbc_errormsg();
 551                  $this->_errorCode = odbc_error();
 552              } else
 553                  $this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
 554          }
 555          return $stmtid;
 556      }
 557  
 558      /*
 559          Insert a null into the blob field of the table first.
 560          Then use UpdateBlob to store the blob.
 561          
 562          Usage:
 563           
 564          $conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');
 565          $conn->UpdateBlob('blobtable','blobcol',$blob,'id=1');
 566      */
 567  	function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
 568      {
 569          return $this->Execute("UPDATE $table SET $column=? WHERE $where",array($val)) != false;
 570      }
 571      
 572      // returns true or false
 573  	function _close()
 574      {
 575          $ret = @odbc_close($this->_connectionID);
 576          $this->_connectionID = false;
 577          return $ret;
 578      }
 579  
 580  	function _affectedrows()
 581      {
 582          return $this->_lastAffectedRows;
 583      }
 584      
 585  }
 586      
 587  /*--------------------------------------------------------------------------------------
 588       Class Name: Recordset
 589  --------------------------------------------------------------------------------------*/
 590  
 591  class ADORecordSet_odbc extends ADORecordSet {    
 592      
 593      var $bind = false;
 594      var $databaseType = "odbc";        
 595      var $dataProvider = "odbc";
 596      var $useFetchArray;
 597      var $_has_stupid_odbc_fetch_api_change;
 598      
 599  	function ADORecordSet_odbc($id,$mode=false)
 600      {
 601          if ($mode === false) {  
 602              global $ADODB_FETCH_MODE;
 603              $mode = $ADODB_FETCH_MODE;
 604          }
 605          $this->fetchMode = $mode;
 606          
 607          $this->_queryID = $id;
 608          
 609          // the following is required for mysql odbc driver in 4.3.1 -- why?
 610          $this->EOF = false;
 611          $this->_currentRow = -1;
 612          //$this->ADORecordSet($id);
 613      }
 614  
 615  
 616      // returns the field object
 617      function &FetchField($fieldOffset = -1) 
 618      {
 619          
 620          $off=$fieldOffset+1; // offsets begin at 1
 621          
 622          $o= new ADOFieldObject();
 623          $o->name = @odbc_field_name($this->_queryID,$off);
 624          $o->type = @odbc_field_type($this->_queryID,$off);
 625          $o->max_length = @odbc_field_len($this->_queryID,$off);
 626          if (ADODB_ASSOC_CASE == 0) $o->name = strtolower($o->name);
 627          else if (ADODB_ASSOC_CASE == 1) $o->name = strtoupper($o->name);
 628          return $o;
 629      }
 630      
 631      /* Use associative array to get fields array */
 632  	function Fields($colname)
 633      {
 634          if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];
 635          if (!$this->bind) {
 636              $this->bind = array();
 637              for ($i=0; $i < $this->_numOfFields; $i++) {
 638                  $o = $this->FetchField($i);
 639                  $this->bind[strtoupper($o->name)] = $i;
 640              }
 641          }
 642  
 643           return $this->fields[$this->bind[strtoupper($colname)]];
 644      }
 645      
 646          
 647  	function _initrs()
 648      {
 649      global $ADODB_COUNTRECS;
 650          $this->_numOfRows = ($ADODB_COUNTRECS) ? @odbc_num_rows($this->_queryID) : -1;
 651          $this->_numOfFields = @odbc_num_fields($this->_queryID);
 652          // some silly drivers such as db2 as/400 and intersystems cache return _numOfRows = 0
 653          if ($this->_numOfRows == 0) $this->_numOfRows = -1;
 654          //$this->useFetchArray = $this->connection->useFetchArray;
 655          $this->_has_stupid_odbc_fetch_api_change = ADODB_PHPVER >= 0x4200;
 656      }    
 657      
 658  	function _seek($row)
 659      {
 660          return false;
 661      }
 662      
 663      // speed up SelectLimit() by switching to ADODB_FETCH_NUM as ADODB_FETCH_ASSOC is emulated
 664      function &GetArrayLimit($nrows,$offset=-1) 
 665      {
 666          if ($offset <= 0) {
 667              $rs =& $this->GetArray($nrows);
 668              return $rs;
 669          }
 670          $savem = $this->fetchMode;
 671          $this->fetchMode = ADODB_FETCH_NUM;
 672          $this->Move($offset);
 673          $this->fetchMode = $savem;
 674          
 675          if ($this->fetchMode & ADODB_FETCH_ASSOC) {
 676              $this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
 677          }
 678          
 679          $results = array();
 680          $cnt = 0;
 681          while (!$this->EOF && $nrows != $cnt) {
 682              $results[$cnt++] = $this->fields;
 683              $this->MoveNext();
 684          }
 685          
 686          return $results;
 687      }
 688      
 689      
 690  	function MoveNext() 
 691      {
 692          if ($this->_numOfRows != 0 && !$this->EOF) {        
 693              $this->_currentRow++;
 694              
 695              if ($this->_has_stupid_odbc_fetch_api_change)
 696                  $rez = @odbc_fetch_into($this->_queryID,$this->fields);
 697              else {
 698                  $row = 0;
 699                  $rez = @odbc_fetch_into($this->_queryID,$row,$this->fields);
 700              }
 701              if ($rez) {
 702                  if ($this->fetchMode & ADODB_FETCH_ASSOC) {
 703                      $this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
 704                  }
 705                  return true;
 706              }
 707          }
 708          $this->fields = false;
 709          $this->EOF = true;
 710          return false;
 711      }    
 712      
 713  	function _fetch()
 714      {
 715  
 716          if ($this->_has_stupid_odbc_fetch_api_change)
 717              $rez = @odbc_fetch_into($this->_queryID,$this->fields);
 718          else {
 719              $row = 0;
 720              $rez = @odbc_fetch_into($this->_queryID,$row,$this->fields);
 721          }
 722          if ($rez) {
 723              if ($this->fetchMode & ADODB_FETCH_ASSOC) {
 724                  $this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
 725              }
 726              return true;
 727          }
 728          $this->fields = false;
 729          return false;
 730      }
 731      
 732  	function _close() 
 733      {
 734          return @odbc_free_result($this->_queryID);        
 735      }
 736  
 737  }
 738  ?>

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