删除分类

reggie_server/src/main/java/com/reggie/controller/admin/CategoryController.java

@@ -51,5 +51,19 @@ public R<PageResult> page(CategoryPageQueryDTO categoryPageQueryDTO) {
         return R.success(page);
     }
 
+    /**
+     * 根据id删除分类
+     *
+     * @param id 要删除分类的id
+     * @return success
+     */
+    @DeleteMapping
+    @ApiOperation("删除分类")
+    public R<String> deleteById(Long id) {
+        log.info("删除分类:{}", id);
+        categoryService.deleteById(id);
+        return R.success("删除成功");
+    }
+
 
 }

reggie_server/src/main/java/com/reggie/mapper/CategoryMapper.java

@@ -17,4 +17,7 @@ public interface CategoryMapper {
 
     //分类信息分页查询
     Page<Category> pageQuery(CategoryPageQueryDTO categoryPageQueryDTO);
+
+    //删除分类
+    void deleteById(Long id);
 }

reggie_server/src/main/java/com/reggie/mapper/DishFlavorMapper.java

@@ -0,0 +1,8 @@
+package com.reggie.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface DishFlavorMapper {
+
+}

reggie_server/src/main/java/com/reggie/mapper/DishMapper.java

@@ -0,0 +1,10 @@
+package com.reggie.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface DishMapper {
+
+    //根据分类id查询对应的菜品数量
+    Long cuntByCategoryId(Long id);
+}

reggie_server/src/main/java/com/reggie/mapper/SetmealMapper.java

@@ -0,0 +1,10 @@
+package com.reggie.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface SetmealMapper {
+
+    //根据分类id查询对应的套餐数量
+    Long cuntByCategoryId(Long id);
+}

reggie_server/src/main/java/com/reggie/service/CategoryService.java

@@ -13,4 +13,7 @@ public interface CategoryService {
 
     //分类信息分页查询
     PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO);
+
+    //根据id删除分类
+    void deleteById(Long id);
 }

reggie_server/src/main/java/com/reggie/service/DishService.java

@@ -0,0 +1,5 @@
+package com.reggie.service;
+
+public interface DishService {
+
+}

reggie_server/src/main/java/com/reggie/service/SetmealService.java

@@ -0,0 +1,5 @@
+package com.reggie.service;
+
+public interface SetmealService {
+
+}

reggie_server/src/main/java/com/reggie/service/impl/CategoryServiceImpl.java

@@ -2,11 +2,15 @@
 
 import com.github.pagehelper.Page;
 import com.github.pagehelper.PageHelper;
+import com.reggie.constant.MessageConstant;
 import com.reggie.constant.StatusConstant;
 import com.reggie.dto.CategoryDTO;
 import com.reggie.dto.CategoryPageQueryDTO;
 import com.reggie.entity.Category;
+import com.reggie.exception.DeletionNotAllowedException;
 import com.reggie.mapper.CategoryMapper;
+import com.reggie.mapper.DishMapper;
+import com.reggie.mapper.SetmealMapper;
 import com.reggie.result.PageResult;
 import com.reggie.service.CategoryService;
 import lombok.extern.slf4j.Slf4j;
@@ -20,7 +24,13 @@
 public class CategoryServiceImpl implements CategoryService {
 
     @Autowired
-    private CategoryMapper categoryMapper;
+    private CategoryMapper categoryMapper; //分类 DAO
+
+    @Autowired
+    private DishMapper dishMapper;  //菜品DAO
+
+    @Autowired
+    private SetmealMapper setmealMapper;  // 套餐DAO
 
     /**
      * 新增分类
@@ -53,6 +63,29 @@ public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
 
         Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
 
-        return new PageResult(page.getTotal(),page.getResult());
+        return new PageResult(page.getTotal(), page.getResult());
+    }
+
+    /**
+     * 根据id删除分类
+     *
+     * @param id 要删除分类的id
+     */
+    public void deleteById(Long id) {
+        //根据分类id查询对应的菜品数量
+        Long dishCount = dishMapper.cuntByCategoryId(id);
+        if (dishCount > 0) {
+            //当前关联了菜品不能删除
+            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
+        }
+
+        //根据分类id查询对应的套餐数量
+        Long setmealCount = setmealMapper.cuntByCategoryId(id);
+        if (setmealCount > 0) {
+            //当前关联了套餐不能删除
+            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
+        }
+        //删除分类
+        categoryMapper.deleteById(id);
     }
 }

reggie_server/src/main/java/com/reggie/service/impl/DishServiceImpl.java

@@ -0,0 +1,21 @@
+package com.reggie.service.impl;
+
+import com.reggie.mapper.DishFlavorMapper;
+import com.reggie.mapper.DishMapper;
+import com.reggie.service.DishService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * 菜品业务实现
+ */
+@Service
+@Slf4j
+public class DishServiceImpl implements DishService {
+    @Autowired
+    private DishMapper dishMapper;
+    @Autowired
+    private DishFlavorMapper dishFlavorMapper;
+
+}

reggie_server/src/main/java/com/reggie/service/impl/SetmealServiceImpl.java

@@ -0,0 +1,17 @@
+package com.reggie.service.impl;
+
+import com.reggie.mapper.SetmealMapper;
+import com.reggie.service.SetmealService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * 套餐业务实现
+ */
+@Service
+@Slf4j
+public class SetmealServiceImpl implements SetmealService {
+    @Autowired
+    private SetmealMapper setmealMapper;
+}

reggie_server/src/main/resources/mapper/CategoryMapper.xml

@@ -23,4 +23,11 @@
         </where>
         order by sort
     </select>
+
+    <!--删除分类-->
+    <delete id="deleteById">
+        delete
+        from category
+        where id = #{id}
+    </delete>
 </mapper>

reggie_server/src/main/resources/mapper/DishFlavorMapper.xml

@@ -0,0 +1,4 @@
+<?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.reggie.mapper.DishFlavorMapper">
+</mapper>

reggie_server/src/main/resources/mapper/DishMapper.xml

@@ -0,0 +1,11 @@
+<?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.reggie.mapper.DishMapper">
+
+    <!--根据分类id查询对应的菜品数量-->
+    <select id="cuntByCategoryId" resultType="java.lang.Long">
+        select count(id)
+        from dish
+        where category_id = #{id};
+    </select>
+</mapper>

reggie_server/src/main/resources/mapper/SetmealMapper.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.reggie.mapper.SetmealMapper">
+
+    <select id="cuntByCategoryId" resultType="java.lang.Long">
+        select count(*)
+        from setmeal
+        where category_id = #{id}
+    </select>
+</mapper>