苍穹外卖--菜品管理-删除功能实现

sky-server/src/main/java/com/sky/controller/admin/DishController.java

@@ -11,6 +11,8 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
+
 @RestController
 @Slf4j
 @Api(tags = "菜品相关接口")
@@ -40,4 +42,14 @@ public class DishController {
 
         return Result.success(pageResult);
     }
+
+
+    @DeleteMapping
+    @ApiOperation("菜品批量删除")
+    public Result delete(@RequestParam List<Long> ids){ //@RequestParam：能够使用springmvc框架，对1,2,3 参数进行切割
+        log.info("菜品批量删除：{}",ids);
+        //调用业务层的菜品批量删除功能
+        dishService.deleteBath(ids);
+        return Result.success();
+    }
 }

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

@@ -12,4 +12,10 @@ public interface DishFlavorMapper {
      * @param flavors
      */
     void insertBath(List<DishFlavor> flavors);
+
+    /**
+     * 菜品口味的批量删除
+     * @param ids
+     */
+    void deleteBath(List<Long> ids);
 }

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

@@ -10,6 +10,8 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Options;
 import org.apache.ibatis.annotations.Select;
 
+import java.util.List;
+
 @Mapper
 public interface DishMapper {
 
@@ -34,4 +36,18 @@ public interface DishMapper {
      * @return
      */
     Page<DishVO> pageQuery(DishPageQueryDTO dto);
+
+    /**
+     * 根据菜品id，查询菜品数据
+     * @param id
+     * @return
+     */
+    @Select("select * from dish where id = #{id}")
+    Dish getById(Long id);
+
+    /**
+     * 批量删除菜品
+     * @param ids
+     */
+    void deleteBath(List<Long> ids);
 }

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

@@ -0,0 +1,20 @@
+package com.sky.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+/**
+ * 菜品--套餐--中间表setmeal_dish
+ */
+@Mapper
+public interface SetmealDishMapper {
+
+
+    /**
+     * 根据多个菜品id，查询关联的套餐id
+     * @param ids
+     * @return
+     */
+    List<Long> getSetmealIdsByDishIds(List<Long> ids);
+}

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

@@ -4,6 +4,8 @@ import com.sky.dto.DishDTO;
 import com.sky.dto.DishPageQueryDTO;
 import com.sky.result.PageResult;
 
+import java.util.List;
+
 public interface DishService {
     /*
     新增菜品和它的口味
@@ -16,4 +18,10 @@ public interface DishService {
      * @return
      */
     PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO);
+
+    /**
+     * 菜品批量删除
+     * @param ids
+     */
+    void deleteBath(List<Long> ids);
 }

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

@@ -2,12 +2,16 @@ package com.sky.service.impl;
 
 import com.github.pagehelper.Page;
 import com.github.pagehelper.PageHelper;
+import com.sky.constant.MessageConstant;
+import com.sky.constant.StatusConstant;
 import com.sky.dto.DishDTO;
 import com.sky.dto.DishPageQueryDTO;
 import com.sky.entity.Dish;
 import com.sky.entity.DishFlavor;
+import com.sky.exception.DeletionNotAllowedException;
 import com.sky.mapper.DishFlavorMapper;
 import com.sky.mapper.DishMapper;
+import com.sky.mapper.SetmealDishMapper;
 import com.sky.result.PageResult;
 import com.sky.service.DishService;
 import com.sky.vo.DishVO;
@@ -25,6 +29,8 @@ public class DishServiceImpl implements DishService {
 
     @Autowired
     private DishFlavorMapper dishFlavorMapper;
+    @Autowired
+    private SetmealDishMapper setmealDishMapper;
 
 
     /*
@@ -63,4 +69,32 @@ public class DishServiceImpl implements DishService {
         Page<DishVO> page = dishMapper.pageQuery(dto);
         return new PageResult(page.getTotal(),page.getResult());
     }
+
+    /**
+     * 菜品批量删除
+     * @param ids
+     */
+    @Override
+    @Transactional
+    public void deleteBath(List<Long> ids) {
+        //1.判断菜品的起售状态，如果是起售中，不能删除，程序立马停止，并提示用户
+        //todo 当前是遍历查询菜品，执行了多次select语句，效率低，我们可以使用一条sql查询出所有菜品，再遍历菜品对象是否有起售状态
+        ids.forEach(id->{
+            Dish dish = dishMapper.getById(id);
+            if (dish.getStatus() == StatusConstant.ENABLE) {
+                //不能删除，程序立马停止，并提示用户
+                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
+            }
+        });
+        //2.判断菜品是否被套餐关联，如果被关联了那么不能删除，程序立马停止，并提示用户
+        List<Long> setmealIds =  setmealDishMapper.getSetmealIdsByDishIds(ids);
+        if (setmealIds != null && setmealIds.size() > 0) {
+            //不能删除，程序立马停止，并提示用户
+            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
+        }
+        //3.如果菜品可以删除，那么相关的口味也要删除掉
+        //根据菜品id删除菜品和口味数据
+        dishMapper.deleteBath(ids);
+        dishFlavorMapper.deleteBath(ids);
+    }
 }

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

@@ -10,4 +10,10 @@
         (#{flavor.dishId},#{flavor.name},#{flavor.value})
         </foreach>
     </insert>
+    <delete id="deleteBath">
+        delete from dish_flavor where dish_id in
+        <foreach collection="ids" item="id" separator="," open="(" close=")">
+            #{id}
+        </foreach>
+    </delete>
 </mapper>

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

@@ -7,6 +7,7 @@
         insert into dish (name, category_id, price, image, description, create_time, update_time, create_user, update_user,status)
         values (#{name},#{categoryId},#{price},#{image},#{description},#{createTime},#{updateTime},#{createUser},#{updateUser},#{status})
     </insert>
+
     <select id="pageQuery" resultType="com.sky.vo.DishVO">
         SELECT d.*,c.name categoryName FROM dish d LEFT JOIN category c ON d.category_id = c.id
            <where>
@@ -23,4 +24,12 @@
 
         ORDER BY d.create_time DESC
     </select>
+
+
+    <delete id="deleteBath">
+        delete from dish where id in
+        <foreach collection="ids" item="id" separator="," open="(" close=")">
+            #{id}
+        </foreach>
+    </delete>
 </mapper>

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

@@ -0,0 +1,10 @@
+<?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.SetmealDishMapper">
+    <select id="getSetmealIdsByDishIds" resultType="java.lang.Long">
+        SELECT setmeal_id FROM setmeal_dish WHERE dish_id  IN
+        <foreach collection="ids" item="id" separator="," open="(" close=")">
+            #{id}
+        </foreach>
+    </select>
+</mapper>