pencarian datatable

//if (!isset($filter['show_all'])) {

//============DATATABLE
        if (isset($filter['datatable_search'])){
            $this->db_main
                ->group_start()
                ->or_like('item_code',$filter['datatable_search'])
                ->or_like('item_title',$filter['datatable_search'])
                ->group_end();
        }