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rcube_db_mssql.php
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rcube_db_mssql.php
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<?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 Framework
* @subpackage Database
*/
class rcube_db_mssql extends rcube_db
{
public $db_provider = 'mssql';
/**
* Driver initialization
*/
protected function init()
{
$this->options['identifier_start'] = '[';
$this->options['identifier_end'] = ']';
}
/**
* Character setting
*/
protected function set_charset($charset)
{
// UTF-8 is default
}
/**
* 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
*
* @param string $query SQL query
* @param int $limit Number of rows
* @param int $offset Offset
*
* @return string SQL query
*/
protected function set_limit($query, $limit = 0, $offset = 0)
{
$limit = intval($limit);
$offset = intval($offset);
$end = $offset + $limit;
// query without OFFSET
if (!$offset) {
$query = preg_replace('/^SELECT\s/i', "SELECT TOP $limit ", $query);
return $query;
}
$orderby = stristr($query, 'ORDER BY');
$offset += 1;
if ($orderby !== false) {
$query = trim(substr($query, 0, -1 * strlen($orderby)));
}
else {
// it shouldn't happen, paging without sorting has not much sense
// @FIXME: I don't know how to build paging query without ORDER BY
$orderby = "ORDER BY 1";
}
$query = preg_replace('/^SELECT\s/i', '', $query);
$query = "WITH paging AS (SELECT ROW_NUMBER() OVER ($orderby) AS [RowNumber], $query)"
. " SELECT * FROM paging WHERE [RowNumber] BETWEEN $offset AND $end ORDER BY [RowNumber]";
return $query;
}
/**
* Returns PDO DSN string from DSN array
*/
protected function dsn_string($dsn)
{
$params = array();
$result = $dsn['phptype'] . ':';
if ($dsn['hostspec']) {
$host = $dsn['hostspec'];
if ($dsn['port']) {
$host .= ',' . $dsn['port'];
}
$params[] = 'host=' . $host;
}
if ($dsn['database']) {
$params[] = 'dbname=' . $dsn['database'];
}
if (!empty($params)) {
$result .= implode(';', $params);
}
return $result;
}
}

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