小编Moh*_*med的帖子

我试图@Transactional在我的服务的方法中使用注释来懒洋洋地加载一个字段.但是,@Transactional在我的Implementation类上使用会生成所有自动装配的字段null.

这是我的实现:

@Service
public class UserServiceImpl implements UserService {

 /**
  * DefaultMapper.
  */
 @Autowired
 private DefaultMapper defaultMapper;

 /**
  * Resource service injection.
  */
 @Autowired
 private ResourceService resourceService;

 /**
  * UserRepository.
  */
 @Autowired
 private UserRepository userRepository;

 /**
  * Jwt Factory.
  */
 @Autowired
 private JwtService jwtService;

 @Override
 @Transactional
 public final UserDto findByLogin(final String login) throws ResourceNotFoundException {
 // user repository is null here when using @Transactional
  User user = this.userRepository.findByLogin(login)
   .orElseThrow(() -> new ResourceNotFoundException(
    resourceService.getMessage(MessageBundle.EXCEPTION, "resource.notfound.user.login") …

我想问一下如何SELECT Distinct on field在 Querydsl 4 中创建一个。执行此 SQL 请求的最佳方法是什么：

SELECT DISTINCT ON 
    (company_id, EXTRACT(MONTH FROM createddt), EXTRACT(YEAR FROM createddt)) id, 
    createddt 
FROM companystats 
ORDER BY company_id, 
    EXTRACT(MONTH FROM createddt) DESC,
    EXTRACT(YEAR FROM createddt) DESC,
    createddt DESC

谢谢。