public function fetch_all() {
        $json_object;
        $json_objects = array();
        while($this->fetch_row()){
                $json_object=json_encode($this->row);
                $json_objects[]=$json_object;
         }
         for ($n=0; $n<count($json_objects); $n++){
                    $json_objects[$n]=json_decode($json_objects[$n],true);
         }

        return $json_objects;
    }