苍穹外卖--添加购物车代码实现

sky-server/src/main/java/com/sky/controller/user/ShoppingCartController.java

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+package com.sky.controller.user;
+
+import com.sky.dto.ShoppingCartDTO;
+import com.sky.result.Result;
+import com.sky.service.ShoppingCartService;
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RequestMapping("/user/shoppingCart")
+@RestController
+@Slf4j
+@Api(tags = "C端购物车相关接口")
+public class ShoppingCartController {
+
+    @Autowired
+    private ShoppingCartService shoppingCartService;
+
+    @PostMapping("/add")
+    @ApiOperation("添加购物车")
+    public Result add(@RequestBody ShoppingCartDTO shoppingCartDTO){
+        log.info("添加购物车：商品信息：{}",shoppingCartDTO);
+        //调用购物车业务层的添加购物车功能
+        shoppingCartService.addShoppingCart(shoppingCartDTO);
+        return Result.success();
+    }
+}

sky-server/src/main/java/com/sky/mapper/ShoppingCartMapper.java

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+package com.sky.mapper;
+
+import com.sky.dto.ShoppingCartDTO;
+import com.sky.entity.ShoppingCart;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Update;
+
+import java.util.List;
+
+@Mapper
+public interface ShoppingCartMapper {
+    List<ShoppingCart> list(ShoppingCart shoppingCart);
+
+    /*
+    * 修改对应购物车商品的数量
+    * */
+    @Update("update shopping_cart set number = #{number} where id = #{id}")
+    void updateNumberById(ShoppingCart cart);
+
+    @Insert("insert into shopping_cart (name, user_id, dish_id, setmeal_id, dish_flavor, number, amount, image, create_time) " +
+            "values (#{name},#{userId},#{dishId},#{setmealId},#{dishFlavor},#{number},#{amount},#{image},#{createTime})")
+    void insert(ShoppingCart cart);
+}

sky-server/src/main/java/com/sky/service/ShoppingCartService.java

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+package com.sky.service;
+
+import com.sky.dto.ShoppingCartDTO;
+
+public interface ShoppingCartService {
+    /*
+    添加购物车
+     */
+    void addShoppingCart(ShoppingCartDTO shoppingCartDTO);
+}

sky-server/src/main/java/com/sky/service/impl/ShoppingCartServiceImpl.java

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+package com.sky.service.impl;
+
+import com.sky.context.BaseContext;
+import com.sky.dto.ShoppingCartDTO;
+import com.sky.entity.Dish;
+import com.sky.entity.Setmeal;
+import com.sky.entity.ShoppingCart;
+import com.sky.mapper.DishMapper;
+import com.sky.mapper.SetmealMapper;
+import com.sky.mapper.ShoppingCartMapper;
+import com.sky.service.ShoppingCartService;
+import org.springframework.beans.BeanUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Service
+public class ShoppingCartServiceImpl implements ShoppingCartService {
+
+    @Autowired
+    private ShoppingCartMapper shoppingCartMapper;
+
+    @Autowired
+    private SetmealMapper setmealMapper;
+
+    @Autowired
+    private DishMapper dishMapper;
+
+    /*
+    添加购物车
+     */
+    @Override
+    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
+        //封装一个用来查询购物车的实体类对象
+        ShoppingCart shoppingCart = new ShoppingCart();
+        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
+        //设置用户id进行区分
+        shoppingCart.setUserId(BaseContext.getCurrentId());
+
+        //1.判断当前用户的购物车中，是否有已经存在该商品（有可能是菜品或者套餐）（使用一条动态sql查询即可）
+        List<ShoppingCart> cartList =  shoppingCartMapper.list(shoppingCart);
+
+        //2. 如果已经存在，则数量+1(update)
+        ShoppingCart cart = null;
+        if (cartList != null && cartList.size() > 0) {
+            cart = cartList.get(0);
+            cart.setNumber(cart.getNumber()+1);
+            shoppingCartMapper.updateNumberById(cart);
+        }else{
+
+            //3.如果不存在，则向购物车表中插入一条数据（insert）
+            //判断当前添加的是菜品还是套餐
+            if (shoppingCartDTO.getSetmealId() != null) {
+                //添加的是套餐
+                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
+                //封装一个保存套餐的购物车对象
+                cart = ShoppingCart.builder()
+                        .name(setmeal.getName())
+                        .image(setmeal.getImage())
+//                        .userId(BaseContext.getCurrentId())
+                        .setmealId(shoppingCartDTO.getSetmealId())
+//                        .number(1)
+                        .amount(setmeal.getPrice())
+//                        .createTime(LocalDateTime.now())
+                        .build();
+//                shoppingCartMapper.insert(setmealCart);
+            }else{
+                //添加的是菜品
+
+                Dish dish = dishMapper.getById(shoppingCartDTO.getDishId());
+                //封装一个保存套餐的购物车对象
+                cart = ShoppingCart.builder()
+                        .name(dish.getName())
+                        .image(dish.getImage())
+//                        .userId(BaseContext.getCurrentId())
+                        .dishId(shoppingCartDTO.getDishId())
+                        .dishFlavor(shoppingCartDTO.getDishFlavor())
+//                        .number(1)
+                        .amount(dish.getPrice())
+//                        .createTime(LocalDateTime.now())
+                        .build();
+//                shoppingCartMapper.insert(dishCart);
+            }
+            //对不管是菜品还是套餐的相同操作，统一处理
+            cart.setNumber(1);
+            cart.setUserId(BaseContext.getCurrentId());
+            cart.setCreateTime(LocalDateTime.now());
+            shoppingCartMapper.insert(cart);
+        }
+
+
+    }
+}

sky-server/src/main/resources/mapper/ShoppingCartMapper.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
+<mapper namespace="com.sky.mapper.ShoppingCartMapper">
+    <select id="list" resultType="com.sky.entity.ShoppingCart">
+        select * from shopping_cart
+        <where>
+            <if test="dishId != null">
+                and dish_id = #{dishId}
+            </if>
+            <if test="dishFlavor != null">
+                and dish_flavor = #{dishFlavor}
+            </if>
+            <if test="setmealId != null">
+                and setmeal_id = #{setmealId}
+            </if>
+            <if test="userId != null">
+                and user_id = #{userId}
+            </if>
+        </where>
+    </select>
+</mapper>