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