Mybatis把返回结果封装成map类型的实现

public interface UserDao {
    public Map<String, Object> getMapUser(int id);
}

<!--注意：返回类型为Map类型-->
<mapper namespace="com.lzj.mybatis.dao.UserDao">
    <select id="getMapUser" resultType="Map">
        select * from users where id=#{id}
    </select>
</mapper>

    public static void testGetMapUser(){
        String resource = "conf.xml";
        InputStream in = MybaitsTest.class.getClassLoader().getResourceAsStream(resource);
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);   
        SqlSession session = factory.openSession();
        UserDao userDao = session.getMapper(UserDao.class);
        Map<String, Object> userMap = userDao.getMapUser(1);
        System.out.println(userMap);
    }

public interface UserDao {
    /*用MapKey注解指定字段name作为map中的key*/
    @MapKey("name")
    public Map<String, User> getUserMap(String name);
}

<!--注意：resultType为User类型-->
<mapper namespace="com.lzj.mybatis.dao.UserDao">
    <select id="getUserMap" resultType="com.lzj.mybaits.bean.User">
        select * from users where name=#{name}
    </select>
</mapper>

    public static void testGetUserMap(){
        String resource = "conf.xml";
        InputStream in = MybaitsTest.class.getClassLoader().getResourceAsStream(resource);
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);   
        SqlSession session = factory.openSession();
        UserDao userDao = session.getMapper(UserDao.class);
        Map<String, User> userMap = userDao.getUserMap("Bob");
        System.out.println(userMap);
    }