<?php
/**
* DbSimple_Mysql: MySQL 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 end blobs are emulated.
*
* @version 2.x $Id: Mysql.php 59 2006-12-17 21:16:54Z dk $
*/
require_once dirname(__FILE__) . '/Generic.php';
/**
* Database class for MySQL.
*/
class DbSimple_Mysql extends DbSimple_Generic_Database
{
var $link;
/**
* constructor(string $dsn)
* Connect to MySQL.
*/
function DbSimple_Mysql($dsn)
{
$p = DbSimple_Generic::parseDSN($dsn);
if (!is_callable('mysql_connect')) {
return $this->_setLastError("-1", "MySQL extension is not loaded", "mysql_connect");
}
$ok = $this->link = @mysql_connect(
$p['host'] . (empty($p['port'])? "" : ":".$p['port']),
$p['user'],
$p['pass'],
true
);
$this->_resetLastError();
if (!$ok) return $this->_setDbError('mysql_connect()');
$ok = @mysql_select_db(preg_replace('{^/}s', '', $p['path']), $this->link);
if (!$ok) return $this->_setDbError('mysql_select_db()');
}
function _performEscape($s, $isIdent=false)
{
if (!$isIdent) {
return "'" . mysql_real_escape_string($s, $this->link) . "'";
} else {
return "`" . str_replace('`', '``', $s) . "`";
}
}
function _performTransaction($parameters=null)
{
return $this->query('BEGIN');
}
function& _performNewBlob($blobid=null)
{
$obj =& new DbSimple_Mysql_Blob($this, $blobid);
return $obj;
}
function _performGetBlobFieldNames($result)
{
$blobFields = array();
for ($i=mysql_num_fields($result)-1; $i>=0; $i--) {
$type = mysql_field_type($result, $i);
if (strpos($type, "BLOB") !== false) $blobFields[] = mysql_field_name($result, $i);
}
return $blobFields;
}
function _performGetPlaceholderIgnoreRe()
{
return '
" (?> [^"\\\\]+|\\\\"|\\\\)* " |
\' (?> [^\'\\\\]+|\\\\\'|\\\\)* \' |
` (?> [^`]+ | ``)* ` | # backticks
/\* .*? \*/ # comments
';
}
function _performCommit()
{
return $this->query('COMMIT');
}
function _performRollback()
{
return $this->query('ROLLBACK');
}
function _performTransformQuery(&$queryMain, $how)
{
// If we also need to calculate total number of found rows...
switch ($how) {
// Prepare total calculation (if possible)
case 'CALC_TOTAL':
$m = null;
if (preg_match('/^(\s* SELECT)(.*)/six', $queryMain[0], $m)) {
if ($this->_calcFoundRowsAvailable()) {
$queryMain[0] = $m[1] . ' SQL_CALC_FOUND_ROWS' . $m[2];
}
}
return true;
// Perform total calculation.
case 'GET_TOTAL':
// Built-in calculation available?
if ($this->_calcFoundRowsAvailable()) {
$queryMain = array('SELECT FOUND_ROWS()');
}
// Else use manual calculation.
// TODO: GROUP BY ... -> COUNT(DISTINCT ...)
$re = '/^
(?> -- [^\r\n]* | \s+)*
(\s* SELECT \s+) #1
(.*?) #2
(\s+ FROM \s+ .*?) #3
((?:\s+ ORDER \s+ BY \s+ .*?)?) #4
((?:\s+ LIMIT \s+ \S+ \s* (?:, \s* \S+ \s*)? )?) #5
$/six';
$m = null;
if (preg_match($re, $queryMain[0], $m)) {
$query[0] = $m[1] . $this->_fieldList2Count($m[2]) . " AS C" . $m[3];
$skipTail = substr_count($m[4] . $m[5], '?');
if ($skipTail) array_splice($query, -$skipTail);
}
return true;
}
return false;
}
function _performQuery($queryMain)
{
$this->_lastQuery = $queryMain;
$this->_expandPlaceholders($queryMain, false);
$result = @mysql_query($queryMain[0], $this->link);
if ($result === false) return $this->_setDbError($queryMain[0]);
if (!is_resource($result)) {
if (preg_match('/^\s* INSERT \s+/six', $queryMain[0])) {
// INSERT queries return generated ID.
return @mysql_insert_id($this->link);
}
// Non-SELECT queries return number of affected rows, SELECT - resource.
return @mysql_affected_rows($this->link);
}
return $result;
}
function _performFetch($result)
{
$row = @mysql_fetch_assoc($result);
if (mysql_error()) return $this->_setDbError($this->_lastQuery);
if ($row === false) return null;
return $row;
}
function _setDbError($query)
{
return $this->_setLastError(mysql_errno(), mysql_error(), $query);
}
function _calcFoundRowsAvailable()
{
$ok = version_compare(mysql_get_server_info($this->link), '4.0') >= 0;
return $ok;
}
}
class DbSimple_Mysql_Blob extends DbSimple_Generic_Blob
{
// MySQL does not support separate BLOB fetching.
var $blobdata = null;
var $curSeek = 0;
function DbSimple_Mysql_Blob(&$database, $blobdata=null)
{
$this->blobdata = $blobdata;
$this->curSeek = 0;
}
function read($len)
{
$p = $this->curSeek;
$this->curSeek = min($this->curSeek + $len, strlen($this->blobdata));
return substr($this->blobdata, $this->curSeek, $len);
}
function write($data)
{
$this->blobdata .= $data;
}
function close()
{
return $this->blobdata;
}
function length()
{
return strlen($this->blobdata);
}
}
?>
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