org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement

org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.xxxx.mapper.EmployeeMapper.selectBybelongweeknull'.  It's likely that neither a Result Type nor a Result Map was specified.

原因是我没有写返回类型

 修改后：