MyBatis（七） 自定义映射结果ResultMap

（1）接口中对应的方法

public Emp getEmpById(Integer id);

（2）Mapper文件

　<resultMap type="com.eu.bean.Emp" id="emp">
      <id column="id" property="id"/>
      <result column="last_name" property="lastName"/>
      <result column="gender" property="geder"/>
      <result column="email" property="email"/>
  </resultMap>
  
  
  <select id="getEmpById" resultMap="emp">
      select * from emp where id = #{id}
  </select>

 （3）测试

　　public SqlSessionFactory getSqlSessionFactory() throws IOException {
        String resource = "conf/mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        return new SqlSessionFactoryBuilder().build(inputStream);
    }
    
    @Test
    public void testMapper() throws IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        //1.获取到sqlsession 不会自动提交数据
        SqlSession openSession = sqlSessionFactory.openSession();
        EmpDao mapper = openSession.getMapper(EmpDao.class);
        
        Emp emp = mapper.getEmpById(4);
        System.out.println(emp);
        
        //手动提交数据
        openSession.commit();
        openSession.close();
    }