public function check_isset_view () {
        $query=  $this->mysql->q('SELECT table_name FROM INFORMATION_SCHEMA.VIEWS WHERE VIEW_DEFINITION LIKE  "%'.$this->tablename.'%" AND table_name="'.$this->tablename.'_view_all"');
        $num = $this->mysql->n($query);
        if($num==0){
            return false;
        }
        else
            return true;
    }