杂货品牌模型 - 数据库更新

Question

public function services()
    {
        $username=$this->session->userdata('username');
        if($username!='')
        {
            $crud = new grocery_CRUD();


            $crud->set_table('tbl_services');

            $crud->set_subject('Services');
            $crud->columns('s_id','s_companyname','s_type','s_country','s_state','s_district','s_email','s_mobile','s_photo','s_active');
            $crud->set_relation('s_type','tbl_service_cat','service_desc');
            $crud->set_relation('s_country','tbl_country','country');
            $crud->set_relation('s_state','tbl_state','state');

            $crud->set_relation('s_district','tbl_district','district');
            $crud->set_field_upload('s_photo','uploads');
            $crud->callback_after_update(array($this,'rename_serviceimg_db'));
            $crud->callback_after_insert(array($this,'rename_serviceimg_db'));

            //$crud->set_relation('q_id','tbl_discussionanswer','q_id');
            $output = $crud->render();
            $this->_admin_output($output);
            }
        else
        {
            $this->index();
        }

这是我的控制器功能。在这种类型中，country，dist，state作为数据库中的相应id插入。但我想要名字本身。