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1.新增接口

1.1 查看新增接口前端传递的参数格式

发现这里的前端请求体，主要关联数据库中的setmeal表和setmeal_dish表
因此后端接收数据需要自己定义一个DTO接收

1.2 设计Controller

SetMealController

@RestController
@Api(tags = "套餐相关接口")
@RequestMapping("/admin/setmeal")
@Slf4j
public class SetMealController {@AutowiredSetmealService setmealService;@PostMapping@ApiOperation("新增套餐")public Result save(@RequestBody SetmealDTO setmealDTO) {setmealService.saveWithDish(setmealDTO);return Result.success();}
}

这里的SetMealDTO和前端传递的参数一一对应，苍穹外卖项目已存在该DTO

1.3 设计Service接口实现类

接口

package com.sky.service;import com.sky.dto.SetmealDTO;public interface SetmealService {void saveWithDish(SetmealDTO setmealDTO);
}

实现类

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {@Autowiredprivate SetmealMapper setmealMapper;@Autowiredprivate SetmealDishMapper setmealDishMapper;@Override@Transactionalpublic void saveWithDish(SetmealDTO setmealDTO) {// 将前端数据插入套餐表Setmeal setmeal = new Setmeal();BeanUtils.copyProperties(setmealDTO, setmeal);setmealMapper.insert(setmeal);// 将前端数据插入setmeal_dish表Long id = setmeal.getId(); // 这里得到的id是套餐和菜品关联的idList<SetmealDish> setmealDishList = setmealDTO.getSetmealDishes();if (setmealDishList != null && setmealDishList.size() > 0) {setmealDishList.forEach(setmealDish -> {setmealDish.setSetmealId(id); // 菜品和套餐关联的id设置进去});// 向套餐表中插入n条数据setmealDishMapper.insertBatch(setmealDishList);}}
}

1.4 Mapper实现

SetmealMapper接口

@Mapper
public interface SetmealMapper {@AutoFill(value = OperationType.INSERT)void insert(Setmeal setmeal);
}

SetmealMapper实现

<?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.SetmealMapper"><insert id="insert" parameterType="Setmeal" useGeneratedKeys="true" keyProperty="id">insert into setmeal (category_id, name, price, description, image, create_time, update_time, create_user, update_user, status)values(#{categoryId}, #{name}, #{price}, #{description}, #{image}, #{createTime}, #{updateTime}, #{createUser}, #{updateUser}, #{status})</insert>
</mapper>

SetmealDishMapper接口

@Mapper
public interface SetmealDishMapper {void insertBatch(List<SetmealDish> setmealDishList);
}

SetmealDishMapper实现

    <insert id="insertBatch">insert into setmeal_dish (setmeal_id, dish_id, name, price, copies)  VALUES<foreach collection="setmealDishList" item="sd" separator=",">(#{sd.setmealId}, #{sd.dishId}, #{sd.name}, #{sd.price}, #{sd.copies})</foreach></insert>

2.根据分类id查询菜品接口

这个一开始没有考虑到，不写的话下面的数据无法渲染出来

2.1 Controller

/*** 根据分类id查询菜品* @param categoryId* @return
*/
@GetMapping("/list")
@ApiOperation("根据分类id查询菜品")
public Result<List<Dish>> list(Long categoryId){List<Dish> list = dishService.list(categoryId);return Result.success(list);
}

2.2 Service

/*** 根据分类id查询菜品* @param categoryId* @return
*/
List<Dish> list(Long categoryId);

Impl

    /*** 根据分类id查询菜品* @param categoryId* @return*/@Overridepublic List<Dish> findAllDish(Long categoryId) {List<Dish> list = dishMapper.queryAll(categoryId);return list;}

2.3 Mapper

/*** 动态条件查询菜品* @param dish* @return
*/
List<Dish> list(Dish dish);

xml

<select id="list" resultType="Dish" parameterType="Dish">select * from dish<where><if test="name != null">and name like concat('%',#{name},'%')</if><if test="categoryId != null">and category_id = #{categoryId}</if><if test="status != null">and status = #{status}</if></where>order by create_time desc
</select>

3 总结

先看接口文档，再看接口文档对应的数据库表，最后开始开发