业务需求：

在小程序用户端购物车页面能查到当前用户的所有菜品或者套餐

代码实现

controller层

@GetMapping("/list")
    public Result<List<ShoppingCart>> list(){
        List<ShoppingCart> list = shoppingCartService.shopShoppingCart();
        return Result.success(list);
    }

实现类

获取当前用户的userId,组装成一个shoppingcart对象，调用后台sql进行查询，将查询的list返回。

    @Override
    public List<ShoppingCart> shopShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart cart = ShoppingCart.builder()
                .userId(userId)
                .build();

        List<ShoppingCart> list = shoppingCartMapper.list(cart);

        return list;
    }

清空购物车

@DeleteMapping("/clean")
    public Result clean(){
        shoppingCartService.deleteShoppingCart();
        return Result.success();
    }

 

@Override
    public void deleteShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

 

@Delete("delete * from shopping_cart where id=#{userId}")
    void deleteByUserId(Long userId);