MyBatis返回map数据

（1）接口中编写方法

　　//单行
    public Map<String, Object> getEmpReturnMap(Integer id);
    
    //多行
    @MapKey("id")
    public Map<Integer, Emp> getEmpReturnMaps(String lastName);

（2）编写Mapper文件

　　MyBatis框架为Map起别名叫map

　　<!-- public Map<String, Object> getEmpReturnMap(Integer id); -->
    <select id="getEmpReturnMap" resultType="map">
        select id,last_name lastName,gender geder,email from Emp where id like #{id }
    </select>
    
    <!-- public Map<String, Object> getEmpReturnMaps(String lastName); -->
    <select id="getEmpReturnMaps" resultType="com.eu.bean.Emp">
        select id,last_name lastName,gender geder,email from Emp where last_name like #{lastName }
    </select>

（3）编写测试

　　@Test
    public void testMapperReMap() 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);
        
         Map<Integer, Emp> empReturnMaps = mapper.getEmpReturnMaps("%e%");
        System.out.println(empReturnMaps);
        
        //手动提交数据
        openSession.commit();
        openSession.close();
    }