<?php
/**
 * Firebird driver.
 *
 * Requires firebird client. Works on Windows and Unix.
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

// security - hide paths
if (!defined('ADODB_DIR')) die();

class ADODB_firebird extends ADOConnection {
	var $databaseType = "firebird";
	var $dataProvider = "firebird";
	var $replaceQuote = "''"; // string to use to replace quotes
	var $fbird_datefmt = '%Y-%m-%d'; // For hours,mins,secs change to '%Y-%m-%d %H:%M:%S';
	var $fmtDate = "'Y-m-d'";
	var $fbird_timestampfmt = "%Y-%m-%d %H:%M:%S";
	var $fbird_timefmt = "%H:%M:%S";
	var $fmtTimeStamp = "'Y-m-d, H:i:s'";
	var $concat_operator='||';
	var $_transactionID;
	var $metaTablesSQL = "select lower(rdb\$relation_name) from rdb\$relations where rdb\$relation_name not like 'RDB\$%'";
	//OPN STUFF start
	var $metaColumnsSQL = "select lower(a.rdb\$field_name), a.rdb\$null_flag, a.rdb\$default_source, b.rdb\$field_length, b.rdb\$field_scale, b.rdb\$field_sub_type, b.rdb\$field_precision, b.rdb\$field_type from rdb\$relation_fields a, rdb\$fields b where a.rdb\$field_source = b.rdb\$field_name and a.rdb\$relation_name = '%s' order by a.rdb\$field_position asc";
	//OPN STUFF end
	var $ibasetrans;
	var $hasGenID = true;
	var $_bindInputArray = true;
	var $buffers = 0;
	var $dialect = 3;
	var $sysDate = "cast('TODAY' as timestamp)";
	var $sysTimeStamp = "CURRENT_TIMESTAMP"; //"cast('NOW' as timestamp)";
	var $ansiOuter = true;
	var $hasAffectedRows = true;
	var $poorAffectedRows = false;
	var $blobEncodeType = 'C';
	var $role = false;
	var $nameQuote = '';		/// string to use to quote identifiers and names

	function __construct()
	{
	// Ignore IBASE_DEFAULT we want a more practical transaction!
	//	if (defined('IBASE_DEFAULT')) $this->ibasetrans = IBASE_DEFAULT;
	//	else
		$this->ibasetrans = IBASE_WAIT | IBASE_REC_VERSION | IBASE_COMMITTED;
	}


	// returns true or false
	function _connect($argHostname, $argUsername, $argPassword, $argDatabasename,$persist=false)
	{
		if (!function_exists('fbird_pconnect')) return null;
		if ($argDatabasename) $argHostname .= ':'.$argDatabasename;
		$fn = ($persist) ? 'fbird_pconnect':'fbird_connect';
		if ($this->role)
			$this->_connectionID = $fn($argHostname,$argUsername,$argPassword,
					$this->charSet,$this->buffers,$this->dialect,$this->role);
		else
			$this->_connectionID = $fn($argHostname,$argUsername,$argPassword,
					$this->charSet,$this->buffers,$this->dialect);

		if ($this->dialect != 1) { // http://www.ibphoenix.com/ibp_60_del_id_ds.php
			$this->replaceQuote = "''";
		}
		if ($this->_connectionID === false) {
			$this->_handleerror();
			return false;
		}

		// PHP5 change.
		if (function_exists('fbird_timefmt')) {
			fbird_timefmt($this->fbird_datefmt,fbird_DATE );
			if ($this->dialect == 1) {
				fbird_timefmt($this->fbird_datefmt,fbird_TIMESTAMP );
			} else {
				fbird_timefmt($this->fbird_timestampfmt,fbird_TIMESTAMP );
			}
			fbird_timefmt($this->fbird_timefmt,fbird_TIME );

		} else {
			ini_set("ibase.timestampformat", $this->fbird_timestampfmt);
			ini_set("ibase.dateformat", $this->fbird_datefmt);
			ini_set("ibase.timeformat", $this->fbird_timefmt);
		}
		return true;
	}

	// returns true or false
	function _pconnect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		return $this->_connect($argHostname, $argUsername, $argPassword, $argDatabasename,true);
	}


	function MetaPrimaryKeys($table,$owner_notused=false,$internalKey=false)
	{
		if ($internalKey) {
			return array('RDB$DB_KEY');
		}

		$table = strtoupper($table);

		$sql = 'SELECT S.RDB$FIELD_NAME AFIELDNAME
	FROM RDB$INDICES I JOIN RDB$INDEX_SEGMENTS S ON I.RDB$INDEX_NAME=S.RDB$INDEX_NAME
	WHERE I.RDB$RELATION_NAME=\''.$table.'\' and I.RDB$INDEX_NAME like \'RDB$PRIMARY%\'
	ORDER BY I.RDB$INDEX_NAME,S.RDB$FIELD_POSITION';

		$a = $this->GetCol($sql,false,true);
		if ($a && sizeof($a)>0) return $a;
		return false;
	}

	function ServerInfo()
	{
		$arr['dialect'] = $this->dialect;
		switch($arr['dialect']) {
		case '':
		case '1': $s = 'Firebird Dialect 1'; break;
		case '2': $s = 'Firebird Dialect 2'; break;
		default:
		case '3': $s = 'Firebird Dialect 3'; break;
		}
		$arr['version'] = ADOConnection::_findvers($s);
		$arr['description'] = $s;
		return $arr;
	}

	function BeginTrans()
	{
		if ($this->transOff) return true;
		$this->transCnt += 1;
		$this->autoCommit = false;
		$this->_transactionID = fbird_trans( $this->ibasetrans, $this->_connectionID );
		return $this->_transactionID;
	}

	function CommitTrans($ok=true)
	{
		if (!$ok) {
			return $this->RollbackTrans();
		}
		if ($this->transOff) {
			return true;
		}
		if ($this->transCnt) {
			$this->transCnt -= 1;
		}
		$ret = false;
		$this->autoCommit = true;
		if ($this->_transactionID) {
			//print ' commit ';
			$ret = fbird_commit($this->_transactionID);
		}
		$this->_transactionID = false;
		return $ret;
	}

	function _affectedrows()
	{
			return fbird_affected_rows( $this->_transactionID ? $this->_transactionID : $this->_connectionID );
	}

	// there are some compat problems with ADODB_COUNTRECS=false and $this->_logsql currently.
	// it appears that ibase extension cannot support multiple concurrent queryid's
	function _Execute($sql,$inputarr=false) {
	global $ADODB_COUNTRECS;

		if ($this->_logsql) {
			$savecrecs = $ADODB_COUNTRECS;
			$ADODB_COUNTRECS = true; // force countrecs
			$ret =& ADOConnection::_Execute($sql,$inputarr);
			$ADODB_COUNTRECS = $savecrecs;
		} else {
			$ret = ADOConnection::_Execute($sql,$inputarr);
		}
		return $ret;
	}

	function RollbackTrans()
	{
		if ($this->transOff) return true;
		if ($this->transCnt) $this->transCnt -= 1;
		$ret = false;
		$this->autoCommit = true;
		if ($this->_transactionID) {
			$ret = fbird_rollback($this->_transactionID);
		}
		$this->_transactionID = false;

		return $ret;
	}

	function &MetaIndexes ($table, $primary = FALSE, $owner=false)
	{
		// save old fetch mode
		global $ADODB_FETCH_MODE;
		$false = false;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		if ($this->fetchMode !== FALSE) {
				$savem = $this->SetFetchMode(FALSE);
		}
		$table = strtoupper($table);
		$sql = "SELECT * FROM RDB\$INDICES WHERE RDB\$RELATION_NAME = '".$table."'";
		if (!$primary) {
			$sql .= " AND RDB\$INDEX_NAME NOT LIKE 'RDB\$%'";
		} else {
			$sql .= " AND RDB\$INDEX_NAME NOT LIKE 'RDB\$FOREIGN%'";
		}
		// get index details
		$rs = $this->Execute($sql);
		if (!is_object($rs)) {
			// restore fetchmode
			if (isset($savem)) {
				$this->SetFetchMode($savem);
			}
			$ADODB_FETCH_MODE = $save;
			return $false;
		}

		$indexes = array();
		while ($row = $rs->FetchRow()) {
			$index = $row[0];
			if (!isset($indexes[$index])) {
				if (is_null($row[3])) {
					$row[3] = 0;
				}
				$indexes[$index] = array(
					'unique' => ($row[3] == 1),
					'columns' => array()
				);
			}
			$sql = "SELECT * FROM RDB\$INDEX_SEGMENTS WHERE RDB\$INDEX_NAME = '".$index."' ORDER BY RDB\$FIELD_POSITION ASC";
			$rs1 = $this->Execute($sql);
			while ($row1 = $rs1->FetchRow()) {
				$indexes[$index]['columns'][$row1[2]] = $row1[1];
			}
		}
		// restore fetchmode
		if (isset($savem)) {
			$this->SetFetchMode($savem);
		}
		$ADODB_FETCH_MODE = $save;

		return $indexes;
	}


	// See http://community.borland.com/article/0,1410,25844,00.php
	function RowLock($tables,$where,$col=false)
	{
		if ($this->autoCommit) {
			$this->BeginTrans();
		}
		$this->Execute("UPDATE $table SET $col=$col WHERE $where "); // is this correct - jlim?
		return 1;
	}


	function CreateSequence($seqname = 'adodbseq', $startID = 1)
	{
		$ok = $this->Execute(("CREATE GENERATOR $seqname" ));
		if (!$ok) return false;
		return $this->Execute("SET GENERATOR $seqname TO ".($startID-1));
	}

	function DropSequence($seqname = 'adodbseq')
	{
		$seqname = strtoupper($seqname);
		return $this->Execute("DROP GENERATOR $seqname");
	}

	function GenID($seqname='adodbseq',$startID=1)
	{
		$getnext = ("SELECT Gen_ID($seqname,1) FROM RDB\$DATABASE");
		$rs = @$this->Execute($getnext);
		if (!$rs) {
			$this->Execute(("CREATE GENERATOR $seqname" ));
			$this->Execute("SET GENERATOR $seqname TO ".($startID-1).';');
			$rs = $this->Execute($getnext);
		}
		if ($rs && !$rs->EOF) {
			$this->genID = (integer) reset($rs->fields);
		}
		else {
			$this->genID = 0; // false
		}

		if ($rs) {
			$rs->Close();
		}

		return $this->genID;
	}

	function SelectDB($dbName)
	{
		return false;
	}

	function _handleerror()
	{
		$this->_errorMsg = fbird_errmsg();
	}

	function ErrorNo()
	{
		if (preg_match('/error code = ([\-0-9]*)/i', $this->_errorMsg,$arr)) return (integer) $arr[1];
		else return 0;
	}

	function ErrorMsg()
	{
			return $this->_errorMsg;
	}

	function Prepare($sql)
	{
		$stmt = fbird_prepare($this->_connectionID,$sql);
		if (!$stmt) return false;
		return array($sql,$stmt);
	}

	   // returns query ID if successful, otherwise false
	   // there have been reports of problems with nested queries - the code is probably not re-entrant?
	function _query($sql,$iarr=false)
	{
		if ( !$this->isConnected() ) return false;
		if (!$this->autoCommit && $this->_transactionID) {
			$conn = $this->_transactionID;
			$docommit = false;
		} else {
			$conn = $this->_connectionID;
			$docommit = true;
		}
		if (is_array($sql)) {
			$fn = 'fbird_execute';
			$sql = $sql[1];
			if (is_array($iarr)) {
				if ( !isset($iarr[0]) ) 
					$iarr[0] = ''; // PHP5 compat hack
				$fnarr = array_merge( array($sql) , $iarr);
				$ret = call_user_func_array($fn,$fnarr);
			}
			else {
				$ret = $fn($sql);
			}
		} else {
			$fn = 'fbird_query';
			if (is_array($iarr)) 
			{
				if (sizeof($iarr) == 0) 
					$iarr[0] = ''; // PHP5 compat hack
				$fnarr = array_merge( array($conn,$sql) , $iarr);
				$ret = call_user_func_array($fn,$fnarr);
			}
			else {
				$ret = $fn($conn, $sql);
			}
		}
		if ($docommit && $ret === true) {
			fbird_commit($this->_connectionID);
		}

		$this->_handleerror();
		return $ret;
	}

	// returns true or false
	function _close()
	{
		if (!$this->autoCommit) {
			@fbird_rollback($this->_connectionID);
		}
		return @fbird_close($this->_connectionID);
	}

	//OPN STUFF start
	function _ConvertFieldType(&$fld, $ftype, $flen, $fscale, $fsubtype, $fprecision, $dialect3)
	{
		$fscale = abs($fscale);
		$fld->max_length = $flen;
		$fld->scale = null;
		switch($ftype){
			case 7:
			case 8:
				if ($dialect3) {
					switch($fsubtype){
						case 0:
							$fld->type = ($ftype == 7 ? 'smallint' : 'integer');
							break;
						case 1:
							$fld->type = 'numeric';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
						case 2:
							$fld->type = 'decimal';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
					} // switch
				} else {
					if ($fscale !=0) {
						$fld->type = 'decimal';
						$fld->scale = $fscale;
						$fld->max_length = ($ftype == 7 ? 4 : 9);
					} else {
						$fld->type = ($ftype == 7 ? 'smallint' : 'integer');
					}
				}
				break;
			case 16:
				if ($dialect3) {
					switch($fsubtype){
						case 0:
							$fld->type = 'decimal';
							$fld->max_length = 18;
							$fld->scale = 0;
							break;
						case 1:
							$fld->type = 'numeric';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
						case 2:
							$fld->type = 'decimal';
							$fld->max_length = $fprecision;
							$fld->scale = $fscale;
							break;
					} // switch
				}
				break;
			case 10:
				$fld->type = 'float';
				break;
			case 14:
				$fld->type = 'char';
				break;
			case 27:
				if ($fscale !=0) {
					$fld->type = 'decimal';
					$fld->max_length = 15;
					$fld->scale = 5;
				} else {
					$fld->type = 'double';
				}
				break;
			case 35:
				if ($dialect3) {
					$fld->type = 'timestamp';
				} else {
					$fld->type = 'date';
				}
				break;
			case 12:
				$fld->type = 'date';
				break;
			case 13:
				$fld->type = 'time';
				break;
			case 37:
				$fld->type = 'varchar';
				break;
			case 40:
				$fld->type = 'cstring';
				break;
			case 261:
				$fld->type = 'blob';
				$fld->max_length = -1;
				break;
		} // switch
	}
	//OPN STUFF end

	// returns array of ADOFieldObjects for current table
	function MetaColumns($table, $normalize=true)
	{
	global $ADODB_FETCH_MODE;

		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

		$rs = $this->Execute(sprintf($this->metaColumnsSQL,strtoupper($table)));

		$ADODB_FETCH_MODE = $save;
		$false = false;
		if ($rs === false) {
			return $false;
		}

		$retarr = array();
		//OPN STUFF start
		$dialect3 = ($this->dialect==3 ? true : false);
		//OPN STUFF end
		while (!$rs->EOF) { //print_r($rs->fields);
			$fld = new ADOFieldObject();
			$fld->name = trim($rs->fields[0]);
			//OPN STUFF start
			$this->_ConvertFieldType($fld, $rs->fields[7], $rs->fields[3], $rs->fields[4], $rs->fields[5], $rs->fields[6], $dialect3);
			if (isset($rs->fields[1]) && $rs->fields[1]) {
				$fld->not_null = true;
			}
			if (isset($rs->fields[2])) {

				$fld->has_default = true;
				$d = substr($rs->fields[2],strlen('default '));
				switch ($fld->type)
				{
				case 'smallint':
				case 'integer': $fld->default_value = (int) $d; break;
				case 'char':
				case 'blob':
				case 'text':
				case 'varchar': $fld->default_value = (string) substr($d,1,strlen($d)-2); break;
				case 'double':
				case 'float': $fld->default_value = (float) $d; break;
				default: $fld->default_value = $d; break;
				}
		//	case 35:$tt = 'TIMESTAMP'; break;
			}
			if ((isset($rs->fields[5])) && ($fld->type == 'blob')) {
				$fld->sub_type = $rs->fields[5];
			} else {
				$fld->sub_type = null;
			}
			//OPN STUFF end
			if ($ADODB_FETCH_MODE == ADODB_FETCH_NUM) $retarr[] = $fld;
			else $retarr[strtoupper($fld->name)] = $fld;

			$rs->MoveNext();
		}
		$rs->Close();
		if ( empty($retarr)) return $false;
		else return $retarr;
	}

	function BlobEncode( $blob )
	{
		$blobid = fbird_blob_create( $this->_connectionID);
		fbird_blob_add( $blobid, $blob );
		return fbird_blob_close( $blobid );
	}

	// since we auto-decode all blob's since 2.42,
	// BlobDecode should not do any transforms
	function BlobDecode($blob)
	{
		return $blob;
	}

	// old blobdecode function
	// still used to auto-decode all blob's
	function _BlobDecode_old( $blob )
	{
		$blobid = fbird_blob_open($this->_connectionID, $blob );
		$realblob = fbird_blob_get( $blobid,$this->maxblobsize); // 2nd param is max size of blob -- Kevin Boillet <kevinboillet@yahoo.fr>
		while($string = fbird_blob_get($blobid, 8192)){
			$realblob .= $string;
		}
		fbird_blob_close( $blobid );

		return( $realblob );
	}

	function _BlobDecode( $blob )
	{
		$blob_data = fbird_blob_info($this->_connectionID, $blob );
		$blobid    = fbird_blob_open($this->_connectionID, $blob );

		if( $blob_data[0] > $this->maxblobsize ) {
			$realblob = fbird_blob_get($blobid, $this->maxblobsize);

			while($string = fbird_blob_get($blobid, 8192)) {
				$realblob .= $string;
			}
		} else {
			$realblob = fbird_blob_get($blobid, $blob_data[0]);
		}

		fbird_blob_close( $blobid );
		return( $realblob );
	}

	function UpdateBlobFile($table,$column,$path,$where,$blobtype='BLOB')
	{
		$fd = fopen($path,'rb');
		if ($fd === false) return false;
		$blob_id = fbird_blob_create($this->_connectionID);

		/* fill with data */

		while ($val = fread($fd,32768)){
			fbird_blob_add($blob_id, $val);
		}

		/* close and get $blob_id_str for inserting into table */
		$blob_id_str = fbird_blob_close($blob_id);

		fclose($fd);
		return $this->Execute("UPDATE $table SET $column=(?) WHERE $where",array($blob_id_str)) != false;
	}

	/*
		Insert a null into the blob field of the table first.
		Then use UpdateBlob to store the blob.

		Usage:

		$conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');
		$conn->UpdateBlob('blobtable','blobcol',$blob,'id=1');
	*/
	function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
	{
	$blob_id = fbird_blob_create($this->_connectionID);

	// fbird_blob_add($blob_id, $val);

	// replacement that solves the problem by which only the first modulus 64K /
	// of $val are stored at the blob field ////////////////////////////////////
	// Thx Abel Berenstein  aberenstein#afip.gov.ar
	$len = strlen($val);
	$chunk_size = 32768;
	$tail_size = $len % $chunk_size;
	$n_chunks = ($len - $tail_size) / $chunk_size;

	for ($n = 0; $n < $n_chunks; $n++) {
		$start = $n * $chunk_size;
		$data = substr($val, $start, $chunk_size);
		fbird_blob_add($blob_id, $data);
	}

	if ($tail_size) {
		$start = $n_chunks * $chunk_size;
		$data = substr($val, $start, $tail_size);
		fbird_blob_add($blob_id, $data);
	}
	// end replacement /////////////////////////////////////////////////////////

	$blob_id_str = fbird_blob_close($blob_id);

	return $this->Execute("UPDATE $table SET $column=(?) WHERE $where",array($blob_id_str)) != false;

	}


	function OldUpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
	{
		$blob_id = fbird_blob_create($this->_connectionID);
		fbird_blob_add($blob_id, $val);
		$blob_id_str = fbird_blob_close($blob_id);
		return $this->Execute("UPDATE $table SET $column=(?) WHERE $where",array($blob_id_str)) != false;
	}

	// Format date column in sql string given an input format that understands Y M D
	// Only since Interbase 6.0 - uses EXTRACT
	// problem - does not zero-fill the day and month yet
	function SQLDate($fmt, $col=false)
	{
		if (!$col) $col = $this->sysDate;
		$s = '';

		$len = strlen($fmt);
		for ($i=0; $i < $len; $i++) {
			if ($s) $s .= '||';
			$ch = $fmt[$i];
			switch($ch) {
			case 'Y':
			case 'y':
				$s .= "extract(year from $col)";
				break;
			case 'M':
			case 'm':
				$s .= "extract(month from $col)";
				break;
			case 'W':
			case 'w':
				// The more accurate way of doing this is with a stored procedure
				// See http://wiki.firebirdsql.org/wiki/index.php?page=DATE+Handling+Functions for details
				$s .= "((extract(yearday from $col) - extract(weekday from $col - 1) + 7) / 7)";
				break;
			case 'Q':
			case 'q':
				$s .= "cast(((extract(month from $col)+2) / 3) as integer)";
				break;
			case 'D':
			case 'd':
				$s .= "(extract(day from $col))";
				break;
			case 'H':
			case 'h':
				$s .= "(extract(hour from $col))";
				break;
			case 'I':
			case 'i':
				$s .= "(extract(minute from $col))";
				break;
			case 'S':
			case 's':
				$s .= "CAST((extract(second from $col)) AS INTEGER)";
				break;

			default:
				if ($ch == '\\') {
					$i++;
					$ch = substr($fmt,$i,1);
				}
				$s .= $this->qstr($ch);
				break;
			}
		}
		return $s;
	}

	// Note that Interbase 6.5 uses this ROWS instead - don't you love forking wars!
	// 		SELECT col1, col2 FROM table ROWS 5 -- get 5 rows
	//		SELECT col1, col2 FROM TABLE ORDER BY col1 ROWS 3 TO 7 -- first 5 skip 2
	function &SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false, $secs=0)
	{
		$nrows = (integer) $nrows;
		$offset = (integer) $offset;
		$str = 'SELECT ';
		if ($nrows >= 0) $str .= "FIRST $nrows ";
		$str .=($offset>=0) ? "SKIP $offset " : '';

		$sql = preg_replace('/^[ \t]*select/i',$str,$sql);
		if ($secs)
			$rs = $this->CacheExecute($secs,$sql,$inputarr);
		else
			$rs = $this->Execute($sql,$inputarr);

		return $rs;
	}

}

/*--------------------------------------------------------------------------------------
		 Class Name: Recordset
--------------------------------------------------------------------------------------*/

class  ADORecordset_firebird extends ADORecordSet
{

	var $databaseType = "firebird";
	var $bind=false;
	var $_cacheType;

	function __construct($id,$mode=false)
	{
	global $ADODB_FETCH_MODE;

			$this->fetchMode = ($mode === false) ? $ADODB_FETCH_MODE : $mode;
			parent::__construct($id);
	}

	/**
	 * Get column information in the Recordset object.
	 * fetchField() can be used in order to obtain information about fields in
	 * a certain query result. If the field offset isn't specified, the next
	 * field that wasn't yet retrieved by fetchField() is retrieved.
	 * @return object containing field information.
	*/
	function FetchField($fieldOffset = -1)
	{
			$fld = new ADOFieldObject;
			 $ibf = fbird_field_info($this->_queryID,$fieldOffset);

			$name = empty($ibf['alias']) ? $ibf['name'] : $ibf['alias'];

			switch (ADODB_ASSOC_CASE) {
				case ADODB_ASSOC_CASE_UPPER:
					$fld->name = strtoupper($name);
					break;
				case ADODB_ASSOC_CASE_LOWER:
					$fld->name = strtolower($name);
					break;
				case ADODB_ASSOC_CASE_NATIVE:
				default:
					$fld->name = $name;
					break;
			}

			$fld->type = $ibf['type'];
			$fld->max_length = $ibf['length'];

			/*       This needs to be populated from the metadata */
			$fld->not_null = false;
			$fld->has_default = false;
			$fld->default_value = 'null';
			return $fld;
	}

	function _initrs()
	{
		$this->_numOfRows = -1;
		$this->_numOfFields = @fbird_num_fields($this->_queryID);

		// cache types for blob decode check
		for ($i=0, $max = $this->_numOfFields; $i < $max; $i++) {
			$f1 = $this->FetchField($i);
			$this->_cacheType[] = $f1->type;
		}
	}

	function _seek($row)
	{
		return false;
	}

	function _fetch()
	{
		$f = @fbird_fetch_row($this->_queryID);
		if ($f === false) {
			$this->fields = false;
			return false;
		}
		// OPN stuff start - optimized
		// fix missing nulls and decode blobs automatically

		global $ADODB_ANSI_PADDING_OFF;
		//$ADODB_ANSI_PADDING_OFF=1;
		$rtrim = !empty($ADODB_ANSI_PADDING_OFF);

		for ($i=0, $max = $this->_numOfFields; $i < $max; $i++) {
			if ($this->_cacheType[$i]=="BLOB") {
				if (isset($f[$i])) {
					$f[$i] = $this->connection->_BlobDecode($f[$i]);
				} else {
					$f[$i] = null;
				}
			} else {
				if (!isset($f[$i])) {
					$f[$i] = null;
				} else if ($rtrim && is_string($f[$i])) {
					$f[$i] = rtrim($f[$i]);
				}
			}
		}
		// OPN stuff end

		$this->fields = $f;
		if ($this->fetchMode == ADODB_FETCH_ASSOC) {
			$this->fields = $this->GetRowAssoc();
		} else if ($this->fetchMode == ADODB_FETCH_BOTH) {
			$this->fields = array_merge($this->fields,$this->GetRowAssoc());
		}
		return true;
	}

	/* Use associative array to get fields array */
	function Fields($colname)
	{
		if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];
		if (!$this->bind) {
			$this->bind = array();
			for ($i=0; $i < $this->_numOfFields; $i++) {
				$o = $this->FetchField($i);
				$this->bind[strtoupper($o->name)] = $i;
			}
		}

		return $this->fields[$this->bind[strtoupper($colname)]];

	}


	function _close()
	{
			return @fbird_free_result($this->_queryID);
	}

	function MetaType($t,$len=-1,$fieldobj=false)
	{
		if (is_object($t)) {
			$fieldobj = $t;
			$t = $fieldobj->type;
			$len = $fieldobj->max_length;
		}
		switch (strtoupper($t)) {
		case 'CHAR':
			return 'C';

		case 'TEXT':
		case 'VARCHAR':
		case 'VARYING':
		if ($len <= $this->blobSize) return 'C';
			return 'X';
		case 'BLOB':
			return 'B';

		case 'TIMESTAMP':
		case 'DATE': return 'D';
		case 'TIME': return 'T';
				//case 'T': return 'T';

				//case 'L': return 'L';
		case 'INT':
		case 'SHORT':
		case 'INTEGER': return 'I';
		default: return ADODB_DEFAULT_METATYPE;
		}
	}

}
