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|
<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_db_sqlsrv.php |
| |
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2012, The Roundcube Dev Team |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Database wrapper class that implements PHP PDO functions |
| for MS SQL Server database |
| |
+-----------------------------------------------------------------------+
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
/**
* Database independent query interface
*
* This is a wrapper for the PHP PDO
*
* @package Database
* @version 1.0
*/
class rcube_db_sqlsrv extends rcube_db
{
protected function init()
{
$this->options['identifier_start'] = '[';
$this->options['identifier_end'] = ']';
}
protected function set_charset($charset)
{
}
/**
* Return SQL function for current time and date
*
* @return string SQL function to use in query
*/
public function now()
{
return "getdate()";
}
/**
* Return SQL statement to convert a field value into a unix timestamp
*
* This method is deprecated and should not be used anymore due to limitations
* of timestamp functions in Mysql (year 2038 problem)
*
* @param string $field Field name
*
* @return string SQL statement to use in query
* @deprecated
*/
public function unixtimestamp($field)
{
return "DATEDIFF(second, '19700101', $field) + DATEDIFF(second, GETDATE(), GETUTCDATE())";
}
/**
* Abstract SQL statement for value concatenation
*
* @return string SQL statement to be used in query
*/
public function concat(/* col1, col2, ... */)
{
$args = func_get_args();
if (is_array($args[0])) {
$args = $args[0];
}
return '(' . join('+', $args) . ')';
}
/**
* Adds TOP (LIMIT,OFFSET) clause to the query
*
*/
protected function set_limit($query, $limit = 0, $offset = 0)
{
// code from MDB2 package
if ($limit > 0) {
$fetch = $offset + $limit;
return preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',
"\\1SELECT\\2 TOP $fetch", $query);
}
// @TODO: proper OFFSET handling i _fetch_row()
return $query;
}
/**
* Returns PDO DSN string from DSN array (parse_dsn() result)
*/
protected function dsn_string($dsn)
{
$params = array();
$result = 'sqlsrv:';
if ($dsn['hostspec']) {
$host = $dsn['hostspec'];
if ($dsn['port']) {
$host .= ',' . $dsn['port'];
}
$params[] = 'Server=' . $host;
}
if ($dsn['database']) {
$params[] = 'Database=' . $dsn['database'];
}
if (!empty($params)) {
$result .= implode(';', $params);
}
return $result;
}
}
|
