public function fetchByPk($pk)
 {
     static $tpls = array();
     if (!isset($tpls[$pk])) {
         $tpls[$pk] = parent::fetchByPk($pk);
     }
     return $tpls[$pk];
 }

 public static function model($className = "FlowFormType")
 {
     return parent::model($className);
 }

 public function fetchAllOrderDateline()
 {
     return parent::fetchAll(array("order" => "dateline DESC"));
 }

 public function afterDelete()
 {
     CacheUtil::update("position");
     CacheUtil::load("position");
     parent::afterDelete();
 }

 public function deleteById($ids)
 {
     $id = explode(",", trim($ids, ","));
     return parent::deleteByPk($id, "`system` = '0'");
 }