<?php
/**
* DbSimple_Ibase: Interbase/Firebird database.
* (C) 2005 Dmitry Koterov, http://forum.dklab.ru/users/DmitryKoterov/
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* See http://www.gnu.org/copyleft/lesser.html
*
* Placeholders are emulated because of logging purposes.
*
* @version 2.x $Id: Ibase.php 63 2006-12-18 09:39:26Z tit $
*/
require_once dirname(__FILE__) . '/Generic.php';
/**
* Best transaction parameters for script queries.
* They never give us update conflicts (unlike others)!
* Used by default.
*/
define('IBASE_BEST_TRANSACTION', IBASE_COMMITTED + IBASE_WAIT + IBASE_REC_VERSION);
define('IBASE_BEST_FETCH', IBASE_UNIXTIME);
/**
* Database class for Interbase/Firebird.
*/
class DbSimple_Ibase extends DbSimple_Generic_Database
{
var $DbSimple_Ibase_BEST_TRANSACTION = IBASE_BEST_TRANSACTION;
var $DbSimple_Ibase_USE_NATIVE_PHOLDERS = true;
var $fetchFlags = IBASE_BEST_FETCH;
var $link;
var $trans;
var $prepareCache = array();
/**
* constructor(string $dsn)
* Connect to Interbase/Firebird.
*/
function DbSimple_Ibase($dsn)
{
$p = DbSimple_Generic::parseDSN($dsn);
if (!is_callable('ibase_connect')) {
return $this->_setLastError("-1", "Interbase/Firebird extension is not loaded", "ibase_connect");
}
$ok = $this->link = ibase_connect(
$p['host'] . (empty($p['port'])? "" : ":".$p['port']) .':'.preg_replace('{^/}s', '', $p['path']),
$p['user'],
$p['pass'],
isset($p['CHARSET']) ? $p['CHARSET'] : 'win1251',
isset($p['BUFFERS']) ? $p['BUFFERS'] : 0,
isset($p['DIALECT']) ? $p['DIALECT'] : 3,
isset($p['ROLE']) ? $p['ROLE'] : ''
);
if (isset($p['TRANSACTION'])) $this->DbSimple_Ibase_BEST_TRANSACTION = eval($p['TRANSACTION'].";");
$this->_resetLastError();
if (!$ok) return $this->_setDbError('ibase_connect()');
}
function _performEscape($s, $isIdent=false)
{
if (!$isIdent)
return "'" . str_replace("'", "''", $s) . "'";
else
return '"' . str_replace('"', '_', $s) . '"';
}
function _performTransaction($parameters=null)
{
if ($parameters === null) $parameters = $this->DbSimple_Ibase_BEST_TRANSACTION;
$this->trans = @ibase_trans($parameters, $this->link);
}
function& _performNewBlob($blobid=null)
{
$obj =& new DbSimple_Ibase_Blob($this, $blobid);
return $obj;
}
function _performGetBlobFieldNames($result)
{
$blobFields = array();
for ($i=ibase_num_fields($result)-1; $i>=0; $i--) {
$info = ibase_field_info($result, $i);
if ($info['type'] === "BLOB") $blobFields[] = $info['name'];
}
return $blobFields;
}
function _performGetPlaceholderIgnoreRe()
{
return '
" (?> [^"\\\\]+|\\\\"|\\\\)* " |
\' (?> [^\'\\\\]+|\\\\\'|\\\\)* \' |
` (?> [^`]+ | ``)* ` | # backticks
/\* .*? \*/ # comments
';
}
function _performCommit()
{
if (!is_resource($this->trans)) return false;
return @ibase_commit($this->trans);
}
function _performRollback()
{
if (!is_resource($this->trans)) return false;
return @ibase_rollback($this->trans);
}
function _performTransformQuery(&$queryMain, $how)
{
// If we also need to calculate total number of found rows...
switch ($how) {
// Prepare total calculation (if possible)
case 'CALC_TOTAL':
// Not possible
return true;
// Perform total calculation.
case 'GET_TOTAL':
// TODO: GROUP BY ... -> COUNT(DISTINCT ...)
$re = '/^
(?> -- [^\r\n]* | \s+)*
(\s* SELECT \s+) #1
((?:FIRST \s+ \S+ \s+ (?:SKIP \s+ \S+ \s+)? )?) #2
(.*?) #3
(\s+ FROM \s+ .*?) #4
((?:\s+ ORDER \s+ BY \s+ .*)?) #5
$/six';
$m = null;
if (preg_match($re, $queryMain[0], $m)) {
$queryMain[0] = $m[1] . $this->_fieldList2Count($m[3]) . " AS C" . $m[4];
$skipHead = substr_count($m[2], '?');
if ($skipHead) array_splice($queryMain, 1, $skipHead);
$skipTail = substr_count($m[5], '?');
if ($skipTail) array_splice($queryMain, -$skipTail);
}
return true;
}
return false;
}
function _performQuery($queryMain)
{
$this->_lastQuery = $queryMain;
$this->_expandPlaceholders($queryMain, $this->DbSimple_Ibase_USE_NATIVE_PHOLDERS);
$hash = $queryMain[0];
if (!isset($this->prepareCache[$hash])) {
$this->prepareCache[$hash] = @ibase_prepare($this->link, $queryMain[0]);
} else {
// Prepare cache hit!
}
$prepared = $this->prepareCache[$hash];
if (!$prepared) return $this->_setDbError($queryMain[0]);
$queryMain[0] = $prepared;
$result = @call_user_func_array('ibase_execute', $queryMain);
// ATTENTION!!!
// WE MUST save prepared ID (stored in $prepared variable) somewhere
// before returning $result because of ibase destructor. Now it is done
// by $this->prepareCache. When variable $prepared goes out of scope, it
// is destroyed, and memory for result also freed by PHP. Totally we
// got "Invalud statement handle" error message.
if ($result === false) return $this->_setDbError($queryMain[0]);
if (!is_resource($result)) {
// Non-SELECT queries return number of affected rows, SELECT - resource.
return @ibase_affected_rows($this->link);
}
return $result;
}
function _performFetch($result)
{
// Select fetch mode.
$flags = $this->fetchFlags;
if (empty($this->attributes['BLOB_OBJ'])) $flags = $flags | IBASE_TEXT;
else $flags = $flags & ~IBASE_TEXT;
$row = @ibase_fetch_assoc($result, $flags);
if (ibase_errmsg()) return $this->_setDbError($this->_lastQuery);
if ($row === false) return null;
return $row;
}
function _setDbError($query)
{
return $this->_setLastError(ibase_errcode(), ibase_errmsg(), $query);
}
}
class DbSimple_Ibase_Blob extends DbSimple_Generic_Blob
{
var $blob; // resourse link
var $id;
var $database;
function DbSimple_Ibase_Blob(&$database, $id=null)
{
$this->database =& $database;
$this->id = $id;
$this->blob = null;
}
function read($len)
{
if ($this->id === false) return ''; // wr-only blob
if (!($e=$this->_firstUse())) return $e;
$data = @ibase_blob_get($this->blob, $len);
if ($data === false) return $this->_setDbError('read');
return $data;
}
function write($data)
{
if (!($e=$this->_firstUse())) return $e;
$ok = @ibase_blob_add($this->blob, $data);
if ($ok === false) return $this->_setDbError('add data to');
return true;
}
function close()
{
if (!($e=$this->_firstUse())) return $e;
if ($this->blob) {
$id = @ibase_blob_close($this->blob);
if ($id === false) return $this->_setDbError('close');
$this->blob = null;
} else {
$id = null;
}
return $this->id ? $this->id : $id;
}
function length()
{
if ($this->id === false) return 0; // wr-only blob
if (!($e=$this->_firstUse())) return $e;
$info = @ibase_blob_info($this->id);
if (!$info) return $this->_setDbError('get length of');
return $info[0];
}
function _setDbError($query)
{
$hId = $this->id === null ? "null" : ($this->id === false ? "false" : $this->id);
$query = "-- $query BLOB $hId";
$this->database->_setDbError($query);
}
// Called on each blob use (reading or writing).
function _firstUse()
{
// BLOB is opened - nothing to do.
if (is_resource($this->blob)) return true;
// Open or create blob.
if ($this->id !== null) {
$this->blob = @ibase_blob_open($this->id);
if ($this->blob === false) return $this->_setDbError('open');
} else {
$this->blob = @ibase_blob_create($this->database->link);
if ($this->blob === false) return $this->_setDbError('create');
}
return true;
}
}
?>
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