苍穹外卖--菜品管理-删除功能实现

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);
+    }
 }