業務需求：

在小程序用戶端購物車頁面能查到當前用戶的所有菜品或者套餐

代碼實現

controller層

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

實現類

獲取當前用戶的userId,組裝成一個shoppingcart對象，調用后臺sql進行查詢，將查詢的list返回。

@Overridepublic List<ShoppingCart> shopShoppingCart() {Long userId = BaseContext.getCurrentId();ShoppingCart cart = ShoppingCart.builder().userId(userId).build();List<ShoppingCart> list = shoppingCartMapper.list(cart);return list;}

清空購物車

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

?

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

?

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