pembatalan trx simpanan

if($qbalance->num_rows()>0){
                $rbalance = $qbalance->row();

                if($r1->trx_type==1){
                    //cash in
                     $new_balance = $rbalance->balance - $r1->amount;
                } else {
                    //cash out
                     $new_balance = $rbalance->balance + $r1->amount;
                }


                $this->db->where('id_member_saving',$r1->id_member_saving);
                $this->db->update('member_saving',array(
                        'balance'=>$new_balance
                    ));
            } else {
                 $this->set_response(array(
                    'success'=>false,
                    'message'=>'Data simpanan tidak ditemukan'
                ), REST_Controller::HTTP_NOT_FOUND);
            }