左侧树：删除分类

src/main/java/iet/ustb/sf/controller/CategoryController.java

@@ -49,4 +49,14 @@ public class CategoryController {
         categoryService.addCategory(params);
         return R.ok();
     }
+
+    /**
+     * 删除分类
+     */
+    @Operation(summary = "删除分类")
+    @PostMapping("/delCategory")
+    public R<?> delCategory(@RequestBody JSONObject params) {
+        categoryService.delCategory(params);
+        return R.ok();
+    }
 }

src/main/java/iet/ustb/sf/service/CategoryService.java

@@ -16,4 +16,6 @@ public interface CategoryService extends IService<Category> {
     List<Category> showCategory(Category category);
 
     void addCategory(JSONObject params);
+
+    void delCategory(JSONObject params);
 }

src/main/java/iet/ustb/sf/service/impl/CategoryServiceImpl.java

@@ -4,6 +4,7 @@ import com.alibaba.fastjson.JSONObject;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import iet.ustb.sf.domain.Category;
+import iet.ustb.sf.domain.Target;
 import iet.ustb.sf.exception.ErrorCode;
 import iet.ustb.sf.exception.ThrowUtils;
 import iet.ustb.sf.mapper.TargetMapper;
@@ -85,6 +86,28 @@ public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category>
         category.setUpdateTime(now);
         categoryMapper.insert(category);
     }
+
+    @Override
+    public void delCategory(JSONObject params) {
+        String id = params.getString("id");
+        CheckUtils.checkEmpty(id, "分类ID");
+        Category category = categoryMapper.selectById(id);
+        ThrowUtils.throwIf(category==null,ErrorCode.PARAMS_ERROR,"分类不存在！");
+
+        Date now = new Date();
+
+        QueryWrapper<Target> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("category_id", category.getId());
+        List<Target> targetList = targetMapper.selectList(queryWrapper);
+        for (Target target : targetList) {
+            target.setLevel(0);
+            target.setCategoryId("");
+            target.setUpdateTime(now);
+        }
+        targetMapper.insertOrUpdate(targetList);
+
+        categoryMapper.deleteById(id);
+    }
 }