苍穹外卖-Day08(购物车)

1.添加

1.需求设计和分析

Path:/user/shoppingCart/add

Method:POST

数据库设计：

作用：暂时存放所选商品的地方
选的什么商品
每个商品的数量
不同用户的购物车需要区分

冗余字段会加快查询速度

2.代码开发

java 复制代码

  //判断当前加入购物车的商品是否在购物车中
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long uesrId = BaseContext.getCurrentId();
        shoppingCart.setUserId(uesrId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在，则增加数量
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else {

            //否则，插入新的购物车数据

            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null) {
                //添加到购物车中的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //添加到购物车中的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

2.查看

1.需求设计和分析

Path:/user/shoppingCart/list

Method:GET

2.代码开发

java 复制代码

   Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(shoppingCart);

3.清空

1.需求设计和分析

Path:/user/shoppingCart/clean

Method:DELETE

2.代码开发

复制代码

Long userId = BaseContext.getCurrentId();

shoppingCartMapper.deleteByUserId(userId);

4.删除

1.需求设计和分析

Path/user/shoppingCart/sub

Method:POST

2.代码开发

java 复制代码

 ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long uesrId = BaseContext.getCurrentId();
        shoppingCart.setUserId(uesrId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);


        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
           if(number == 1){
               shoppingCartMapper.deleteById(cart.getId());
           }else {
               cart.setNumber(number-1);
               shoppingCartMapper.updateNumberById(cart);
           }

        }