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();
     }