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();
     }