64 lines
2.4 KiB
PHP
64 lines
2.4 KiB
PHP
<?php
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/*
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* $Id$
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.phpdoctrine.org>.
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*/
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Doctrine::autoload('Doctrine_Connection');
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/**
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* Doctrine_Connection_Db2
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*
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* @package Doctrine
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* @subpackage Connection
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link www.phpdoctrine.com
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* @since 1.0
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* @version $Revision$
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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*/
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class Doctrine_Connection_Db2 extends Doctrine_Connection
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{
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/**
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* Adds an driver-specific LIMIT clause to the query
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*
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* @param string $query query to modify
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* @param integer $limit limit the number of rows
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* @param integer $offset start reading from given offset
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* @return string the modified query
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*/
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public function modifyLimitQuery($query, $limit, $offset)
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{
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if ($limit <= 0)
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return $query;
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if ($offset == 0) {
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return $query . ' FETCH FIRST '. $limit .' ROWS ONLY';
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} else {
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$sqlPieces = explode('from', $query);
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$select = $sqlPieces[0];
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$table = $sqlPieces[1];
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$col = explode('select', $select);
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$sql = 'WITH OFFSET AS(' . $select . ', ROW_NUMBER() ' .
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'OVER(ORDER BY ' . $col[1] . ') AS dctrn_rownum FROM ' . $table . ')' .
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$select . 'FROM OFFSET WHERE dctrn_rownum BETWEEN ' . $offset .
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'AND ' . ($offset + $limit - 1);
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return $sql;
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}
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}
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} |