MyBatis返回map數據

（1）接口中編寫方法

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

（2）編寫Mapper文件

　　MyBatis框架為Map起別名叫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）編寫測試

　　@Test
    public void testMapperReMap() throws IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        //1.獲取到sqlsession 不會自動提交數據
        SqlSession openSession = sqlSessionFactory.openSession();
        EmpDao mapper = openSession.getMapper(EmpDao.class);
        
         Map<Integer, Emp> empReturnMaps = mapper.getEmpReturnMaps("%e%");
        System.out.println(empReturnMaps);
        
        //手動提交數據
        openSession.commit();
        openSession.close();
    }