mybatis 没有结果映射如何解决：

异常报错如下：

### Error querying database.  Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.jin.mapper.UserMapper.getUserById'.  It's likely that neither a Result Type nor a Result Map was specified.
 

接口类如图：

映射文件如图

执行代码也是正确的

@Test
    public void testUpdate() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);// auto commit = true
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.getUserById();
        System.out.println(user);
    }

执行之后报错如标题错误。

让我们仔细看异常：其实这一句就是我们的解决方案， 我们需要去映射文件设置result type/result map

### Error querying database.  Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.jin.mapper.UserMapper.getUserById'.  It's likely that neither a Result Type nor a Result Map was specified.
 

 解决方法：映射文件加入resultType

    <!--getUserById-->
    <select id="getUserById" resultType="com.jin.pojo.User">
        select * from t_user where id = 2
    </select>