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<?php
/**
* TMysqlMetaData class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2007 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.ActiveRecord.Vendor
*/
Prado::using('System.Data.ActiveRecord.Vendor.TDbMetaDataCommon');
/**
* TMysqlMetaData specialized command builder for Mysql database.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.ActiveRecord.Vendor
* @since 3.1
*/
class TMysqlMetaData extends TDbMetaDataCommon
{
/**
* Build the SQL search string from the criteria object for Postgress database.
* @param TDbConnection database connection.
* @param TActiveRecordCriteria search criteria.
* @return string SQL search.
*/
protected function getSqlFromCriteria($conn, $criteria)
{
if($criteria===null) return '';
$sql = '';
if(($condition = $criteria->getCondition())!==null)
$sql .= ' WHERE '.$condition;
$orders=array();
foreach($criteria->getOrdersBy() as $by=>$ordering)
$orders[] = $this->getOrdering($by, $ordering);
if(count($orders) > 0)
$sql .= ' ORDER BY '.implode(', ', $orders);
if(($limit = $criteria->getLimit())!==null)
{
$offset = $criteria->getOffset();
$offset = $offset===null?0:intval($offset); //assumes integer offset
$sql .= ' LIMIT '.$offset.', '.intval($limit); //assumes integer limit
}
return strlen($sql) > 0 ? $sql : '';
}
protected function getOrdering($by, $direction)
{
$dir = strtolower($direction) == 'desc' ? 'DESC' : 'ASC';
return $this->getColumn($by)->getName(). ' '.$dir;
}
}
?>
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