/**
* 判断符合条件的记录是否存在
* <pre>
* $_where = "name=:name AND sex=:sex AND date >= :date";
* $_aryParams = array(
* ':name'=>'xx',
* ':sex'=>'man',
* ':date'=>'2010-06-15',
* );
* </pre>
* @param string $_where
* @param array $_aryParams
* @return bool
*/
public function exists($_where = "", $_aryParams = array())
{
$criteria = new CDbCriteria();
$criteria->from = $this->tableName();
$criteria->condition = $_where;
$criteria->offset = 0;
$criteria->limit = 1;
$aryRes = $this->getDb()->find($criteria->toSql(), $_aryParams);
return empty($aryRes) ? false : true;
}
