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