Subversion-Projekte lars-tiefland.prado

<?php
/**
 * TSqliteCommandBuilder class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TDbCommandBuilder.php 1863 2007-04-12 12:43:49Z wei $
 * @package System.Data.Common
 */

Prado::using('System.Data.Common.TDbCommandBuilder');

/**
 * TSqliteCommandBuilder provides specifics methods to create limit/offset query commands
 * for Sqlite database.
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id: TDbCommandBuilder.php 1863 2007-04-12 12:43:49Z wei $
 * @package System.Data.Common
 * @since 3.1
 */
class TSqliteCommandBuilder extends TDbCommandBuilder
{
        /**
         * Alters the sql to apply $limit and $offset.
         * @param string SQL query string.
         * @param integer maximum number of rows, -1 to ignore limit.
         * @param integer row offset, -1 to ignore offset.
         * @return string SQL with limit and offset.
         */
        public function applyLimitOffset($sql, $limit=-1, $offset=-1)
        {
                $limit = $limit!==null ? intval($limit) : -1;
                $offset = $offset!==null ? intval($offset) : -1;
                if($limit > 0 || $offset > 0)
                {
                        $limitStr = ' LIMIT '.$limit;
                        $offsetStr = $offset >= 0 ? ' OFFSET '.$offset : '';
                        return $sql.$limitStr.$offsetStr;
                }
                else
                        return $sql;
        }
}