Spring Boot 菜单删除实现代码与事务管理

@RestController
@RequestMapping("/menu")
public class MenuController {
    @Autowired
    private MenuService menuService;
    @Autowired
    private RoleMenuMapper roleMenuMapper;
    /**
     * 删除菜单
     * @param id 菜单ID
     * @return 操作结果
     */
    @DeleteMapping("/del/{id}")
    @Transactional  // 事务注解，确保操作原子性
    public Result deleteMenu(@PathVariable Integer id) {
        try {
            // 1. 查询所有子菜单
            QueryWrapper<MenuEntity> subMenuQuery = new QueryWrapper<>();
            subMenuQuery.eq("parent_id", id);
            List<MenuEntity> subMenus = menuService.list(subMenuQuery);
            // 2. 先删除子菜单与角色的关联关系
            if (!subMenus.isEmpty()) {
                for (MenuEntity subMenu : subMenus) {
                    QueryWrapper<RoleMenuEntity> roleMenuQuery = new QueryWrapper<>();
                    roleMenuQuery.eq("menu_id", subMenu.getMenuId());
                    roleMenuMapper.delete(roleMenuQuery);
                }
                // 3. 删除子菜单
                menuService.remove(subMenuQuery);
            }
            // 4. 删除当前菜单与角色的关联关系
            QueryWrapper<RoleMenuEntity> parentRoleMenuQuery = new QueryWrapper<>();
            parentRoleMenuQuery.eq("menu_id", id);
            roleMenuMapper.delete(parentRoleMenuQuery);
            // 5. 删除当前菜单
            boolean isDeleted = menuService.removeById(id);
            if (isDeleted) {
                return Result.success("菜单删除成功");
            } else {
                return Result.error("菜单不存在或已被删除");
            }
        } catch (Exception e) {
            // 抛出运行时异常，触发事务回滚
            throw new RuntimeException("删除菜单失败：" + e.getMessage());
        }
    }
}

QueryWrapper<MenuEntity> subMenuQuery = new QueryWrapper<>();
subMenuQuery.eq("parent_id", id);
List<MenuEntity> subMenus = menuService.list(subMenuQuery);

for (MenuEntity subMenu : subMenus) {
    QueryWrapper<RoleMenuEntity> roleMenuQuery = new QueryWrapper<>();
    roleMenuQuery.eq("menu_id", subMenu.getMenuId());
    roleMenuMapper.delete(roleMenuQuery);
}

menuService.remove(subMenuQuery);

QueryWrapper<RoleMenuEntity> parentRoleMenuQuery = new QueryWrapper<>();
parentRoleMenuQuery.eq("menu_id", id);
roleMenuMapper.delete(parentRoleMenuQuery);

menuService.removeById(id);