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通过网盘分享的文件：苍穹外卖
链接:
https://pan.baidu.com/s/1JJaFOodXOF_lNJSUiZ6qtw?pwd=ps2t
提取码: ps2t
目录
1、user/ShoppingCartController创建
1、添加购物车
（1）需求分析和设计
冗余字段的存在原因：减少联表查询，加快查询速度
（2）代码开发
1、user/ShoppingCartController创建
位置：sky-server/src/main/java/com/sky/controller/user/ShoppingCartController.java
代码：
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 lombok.extern.slf4j.Slf4j;
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
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
@Autowired
private ShoppingCartMapper shoppingCartMapper;
@Autowired
private DishMapper dishMapper;
@Autowired
private SetmealMapper setmealMapper;
/**
* 添加购物车
* @param shoppingCartDTO
*/
public void add(ShoppingCartDTO shoppingCartDTO) {
//检查购物车商品是否存在
ShoppingCart shoppingCart = new ShoppingCart();
BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//获取用户id
Long userId = BaseContext.getCurrentId();
shoppingCart.setUserId(userId);
//查询购物车商品是否存在
List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//如果购物车商品存在，则更新数据(商品数量+1)
if(list != null && list.size() > 0){
ShoppingCart cart = list.get(0);//取出第一个商品,也是唯一的
cart.setNumber(cart.getNumber() + 1);
shoppingCartMapper.updateNumberByID(cart);
}else {
//如果购物车商品不存在，则插入数据
//判断当前添加的商品是否是套餐还是菜品
Long dishId = shoppingCart.getDishId();
if (dishId != null){
//如果是菜品，则直接插入购物车
Dish dish = dishMapper.getByID(dishId);
shoppingCart.setUserId(userId);
shoppingCart.setName(dish.getName());
shoppingCart.setImage(dish.getImage());
shoppingCart.setAmount(dish.getPrice());
}else{
//如果是套餐，则查询套餐下的所有菜品，并插入购物车
Long setmealId = shoppingCart.getSetmealId();
Setmeal setmeal = setmealMapper.getByID(setmealId);
shoppingCart.setUserId(userId);
shoppingCart.setName(setmeal.getName());
shoppingCart.setImage(setmeal.getImage());
shoppingCart.setAmount(setmeal.getPrice());
}
//设置商品数量和创建时间
shoppingCart.setNumber(1);
shoppingCart.setCreateTime(LocalDateTime.now());
//插入购物车商品
shoppingCartMapper.insert(shoppingCart);
}
}
}示意图：
2、ShoppingCartService创建
位置：sky-server/src/main/java/com/sky/service/ShoppingCartService.java
代码：
package com.sky.service;
import com.sky.dto.ShoppingCartDTO;
public interface ShoppingCartService {
/**
* 添加购物车
* @param shoppingCartDTO
*/
void add(ShoppingCartDTO shoppingCartDTO);
}示意图：
3、ShoppingCartServiceImpl创建
位置：sky-server/src/main/java/com/sky/service/impl/ShoppingCartServiceImpl.java
代码：
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 lombok.extern.slf4j.Slf4j;
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
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
@Autowired
private ShoppingCartMapper shoppingCartMapper;
@Autowired
private DishMapper dishMapper;
@Autowired
private SetmealMapper setmealMapper;
/**
* 添加购物车
* @param shoppingCartDTO
*/
public void add(ShoppingCartDTO shoppingCartDTO) {
//检查购物车商品是否存在
ShoppingCart shoppingCart = new ShoppingCart();
BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//获取用户id
Long userId = BaseContext.getCurrentId();
shoppingCart.setUserId(userId);
//查询购物车商品是否存在
List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//如果购物车商品存在，则更新数据(商品数量+1)
if(list != null && list.size() > 0){
ShoppingCart cart = list.get(0);//取出第一个商品,也是唯一的
cart.setNumber(cart.getNumber() + 1);
shoppingCartMapper.updateNumberByID(cart);
}else {
//如果购物车商品不存在，则插入数据
//判断当前添加的商品是否是套餐还是菜品
Long dishId = shoppingCart.getDishId();
if (dishId != null){
//如果是菜品，则直接插入购物车
Dish dish = dishMapper.getByID(dishId);
shoppingCart.setUserId(userId);
shoppingCart.setName(dish.getName());
shoppingCart.setImage(dish.getImage());
shoppingCart.setAmount(dish.getPrice());
}else{
//如果是套餐，则查询套餐下的所有菜品，并插入购物车
Long setmealId = shoppingCart.getSetmealId();
Setmeal setmeal = setmealMapper.getByID(setmealId);
shoppingCart.setUserId(userId);
shoppingCart.setName(setmeal.getName());
shoppingCart.setImage(setmeal.getImage());
shoppingCart.setAmount(setmeal.getPrice());
}
//设置商品数量和创建时间
shoppingCart.setNumber(1);
shoppingCart.setCreateTime(LocalDateTime.now());
//插入购物车商品
shoppingCartMapper.insert(shoppingCart);
}
}
}示意图：
4、ShoppingCartMapper创建
位置：sky-server/src/main/java/com/sky/mapper/ShoppingCartMapper.java
代码：
package com.sky.mapper;
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 {
/**
* 购物车
* @param shoppingCart
* @return
*/
List<ShoppingCart> list(ShoppingCart shoppingCart);
/**
* 根据ID更新商品数量
* @param shoppingCart
*/
@Update("UPDATE shopping_cart SET number = #{number} WHERE id = #{id}")
void updateNumberByID(ShoppingCart shoppingCart);
/**
* 插入商品数据
* @param shoppingCart
*/
@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 shoppingCart);
}示意图：
5、ShoppingCartMapper.xml创建
位置：sky-server/src/main/resources/mapper/ShoppingCartMapper.xml
代码：
<?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="userId!= null">
and user_id = #{userId}
</if>
<if test="dishId!= null">
and dish_id = #{dishId}
</if>
<if test="setmealId!= null">
and setmeal_id = #{setmealId}
</if>
<if test="dishFlavor != null">
and dish_flavor = #{dishFlavor}
</if>
</where>
</select>
</mapper>示意图：
（3）功能测试
在微信小程序端添加菜品、添加套餐、添加菜品并添加口味数据、重复添加菜品套餐、添加不同口味的菜品，若数据库出现相应的数据，则代表功能完成！
2、查看购物车
（1）需求分析和设计
（2）代码开发
1、ShoppingCartController添加
位置：sky-server/src/main/java/com/sky/controller/user/ShoppingCartController.java
代码：
/**
* 查看购物车列表
* @return
*/
@GetMapping("/list")
@ApiOperation("获取购物车列表")
public Result<List<ShoppingCart>> list(){
log.info("获取购物车列表");
List<ShoppingCart> list = shoppingCartService.showShoppingCart();
return Result.success(list);
}示意图：
2、ShoppingCartServiceImpl添加
位置：sky-server/src/main/java/com/sky/service/impl/ShoppingCartServiceImpl.java
代码：
/**
* 查看购物车
* @return
*/
public List<ShoppingCart> showShoppingCart() {
Long userId = BaseContext.getCurrentId();
ShoppingCart shoppingCart = ShoppingCart.builder()
.userId(userId)
.build();
List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
return list;
}示意图：
3、ShoppingCartService添加
位置：sky-server/src/main/java/com/sky/service/ShoppingCartService.java
代码：
/**
* 查看购物车
*/
List<ShoppingCart> showShoppingCart();示意图：
（3）功能测试
点击购物车出现数据，即代表成功
3、清空购物车
（1）需求分析和设计
（2）代码开发
1、ShoppingCartController
位置：sky-server/src/main/java/com/sky/controller/user/ShoppingCartController.java
代码：
/**
* 清空购物车
* @return
*/
@ApiOperation("清空购物车")
@DeleteMapping("/clean")
public Result clean(){
log.info("删除购物车商品：id为");
shoppingCartService.clean();
return Result.success();
}示意图：
2、ShoppingCartService
位置：sky-server/src/main/java/com/sky/service/ShoppingCartService.java
代码：
/**
* 删除购物车
* @param
*/
void clean();示意图：
3、ShoppingCartServiceImpl
位置：sky-server/src/main/java/com/sky/service/impl/ShoppingCartServiceImpl.java
代码：
//清空购物车
public void clean() {
Long userId = BaseContext.getCurrentId();
shoppingCartMapper.deleteByUserId(userId);
}示意图：
4、ShoppingCartMapper
位置：sky-server/src/main/java/com/sky/mapper/ShoppingCartMapper.java
代码：
/**
* 根据ID删除购物车数据
* @param userId
* @return
*/
@Delete("delete from shopping_cart where user_id = #{userId}")
void deleteByUserId(Long userId);示意图：
（3）功能测试
点击清空，购物车数据消除，即代表功能成功！
