查詢購物車中的商品

Controller層：

@RequestMapping("list.do")
    @ResponseBody
    public ServerResponse<CartVo> list(HttpSession session){
        User user = (User)session.getAttribute(Const.CURRENT_USER);
        if(user ==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.list(user.getId());
    }
 

interface ICartService：

public interface ICartService {
    
    ServerResponse<CartVo> list (Integer userId);
    
}

Service層：

 public ServerResponse<CartVo> list (Integer userId){
        CartVo cartVo = this.getCartVoLimit(userId);
        return ServerResponse.createBySuccess(cartVo);
 }
 

獲取購物車產品數量：

Controller層：

@RequestMapping("get_cart_product_count.do")
    @ResponseBody
    public ServerResponse<Integer> getCartProductCount(HttpSession session){
        User user = (User)session.getAttribute(Const.CURRENT_USER);
        if(user ==null){
            return ServerResponse.createBySuccess(0);
        }
        return iCartService.getCartProductCount(user.getId());
    }
 

Service層：

  public ServerResponse<Integer> getCartProductCount(Integer userId){
        if(userId == null){
            return ServerResponse.createBySuccess(0);
        }
        return ServerResponse.createBySuccess(cartMapper.selectCartProductCount(userId));
    }

mapper：

int selectCartProductCount(@Param("userId") Integer userId);

<select id="selectCartProductCount" parameterType="int" resultType="int">
    select IFNULL(sum(quantity),0) as count from mmall_cart where user_id = #{userId}
 </select>