MyBatis返回map数据

（1）接口中编写方法

1 　　//单行
2     public Map<String, Object> getEmpReturnMap(Integer id);
3     
4     //多行
5     @MapKey("id")
6     public Map<Integer, Emp> getEmpReturnMaps(String lastName);

（2）编写Mapper文件

　　MyBatis框架为Map起别名叫map

1 　　<!-- public Map<String, Object> getEmpReturnMap(Integer id); -->
2     <select id="getEmpReturnMap" resultType="map">
3         select id,last_name lastName,gender geder,email from Emp where id like #{id }
4     </select>
5     
6     <!-- public Map<String, Object> getEmpReturnMaps(String lastName); -->
7     <select id="getEmpReturnMaps" resultType="com.eu.bean.Emp">
8         select id,last_name lastName,gender geder,email from Emp where last_name like #{lastName }
9     </select>

（3）编写测试

 1 　　@Test
 2     public void testMapperReMap() throws IOException {
 3         SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
 4         //1.获取到sqlsession 不会自动提交数据
 5         SqlSession openSession = sqlSessionFactory.openSession();
 6         EmpDao mapper = openSession.getMapper(EmpDao.class);
 7         
 8          Map<Integer, Emp> empReturnMaps = mapper.getEmpReturnMaps("%e%");
 9         System.out.println(empReturnMaps);
10         
11         //手动提交数据
12         openSession.commit();
13         openSession.close();
14     }