public function getGoodsById($id)
 {
     $sql = sprintf("select * from t_goods where id=%d", $id);
     $goods = $this->g_db->getOne($sql);
     $goods_category_service = new GoodsCategoryService();
     $goods_category_id = $goods->goods_category_id;
     $goods_category = $goods_category_service->getGoodsCategoryById($goods_category_id);
     $goods_category_name = $goods_category->goods_category_name;
     $goods->goods_category_name = $goods_category_name;
     return $goods;
 }
     $goods_category = new GoodsCategory(null, $goods_category_name);
     $goods_category_service = new GoodsCategoryService();
     $id = $goods_category_service->addGoodsCategory($goods_category);
     $_SESSION['operation'] = true;
     $_SESSION['operation_msg'] = "添加产品类别:" . $goods_category_name . "成功";
     $log_service->addLog("insert", "产品类别", $id);
     header("Location: ./index.php?mod=goods_category&action=ls");
     break;
 case 'edit_get':
     if (isset($_GET['eid'])) {
         $id = $_GET['eid'];
         if (is_numeric($id)) {
             require_once './class/goods_category_service.class.php';
             require_once 'class/goods_category.class.php';
             $goods_category_service = new GoodsCategoryService();
             $goods_category = $goods_category_service->getGoodsCategoryById($id);
             $goods_category = serialize($goods_category);
             $_SESSION['goods_category'] = $goods_category;
             require_once './goods_category_view_edit_form.php';
         } else {
             header("Location: ./index.php?mod=goods_category&action=ls");
         }
     } else {
         header("Location: ./index.php?mod=goods_category&action=ls");
     }
     break;
 case 'edit_post':
     if (isset($_SESSION["id"])) {
         require_once './class/goods_category_service.class.php';
         require_once 'class/goods_category.class.php';
         $id = $_SESSION["id"];