基于spring data jpa @query返回map的踩坑记录

public interface UserRepository extends JpaRepository<User, Integer> {
 
	/**
	 * 查询某些具体列，用Object[]数组接收
	 * @param realName
	 * @return
	 */
	@Query(value = "select u.userId,u.userName,u.realName from User u where u.realName = :realName")
	public Object[] getUserByRealName2(@Param("realName") String realName);
	
	/**
	 * 查询整个实体对象所有信息，可以直接用实体对象接收
	 * @param realName
	 * @return
	 */
	@Query(value = "select u from User u where u.realName = :realName")
	public User getUserByRealName3(@Param("realName") String realName);
	
	/**
	 * 返回List<Map>信息
	 * @param realName
	 * @return
	 */
	@Query(value = "select new map(u as user) from User u where u.realName = :realName")
	public List<Map<String, Object>> getUserByRealName(@Param("realName") String realName);
	
	/**
	 * 返回map对象
	 * @param realName
	 * @return
	 */
	@Query(value = "select new map(u.realName as userName,o.orgName as orgName) from User u, Org o where u.realName = :realName")
	public Map<String, Object> getUserByRealName1(@Param("realName") String realName);
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:conf/root-context.xml"})
public class UserDaoTest {	
	@Autowired
	private UserRepository userRepository; 
	@Test
	public void test() {		
		Object[] u2 = userRepository.getUserByRealName2("admin");		
		User u3 = userRepository.getUserByRealName3("admin");		
		List<Map<String, Object>> u = userRepository.getUserByRealName("test");
		String userName = ((User) u.get(0).get("user")).getRealName();
		System.out.println(userName);
		
		Map<String, Object> u1 = userRepository.getUserByRealName1("admin");
		String name = ((User) u1.get("userName")).getRealName();
		System.out.println(name);	
		assert(userName.equals("admin"));
	}
}

Query query = this.entityManager.createNativeQuery(sql);
  
  //设置JPA的Query返回Map对象
  query.unwrap(SQLQuery.class).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP).setParameter("createuser", userInfo.getUsercode()).setParameter("type", type); 
  List<Map<String,String>> res =  query.getResultList();