Question

我有一个像：

这样的实体

@Entity
@EntityListeners(ReunionListener.class)
public class Reunion implements Serializable{

private Long id;

@ManyToMany(cascade = {CascadeType.MERGE,
                        CascadeType.PERSIST,
                        CascadeType.DETACH,
                        CascadeType.REFRESH },
            fetch = FetchType.EAGER)
@JoinTable(name = "Reunion_User",
              joinColumns = @JoinColumn(name = "Reunion_id", referencedColumnName = "id"), 
                 inverseJoinColumns = @JoinColumn(name = "User_id", referencedColumnName = "id")
                 )
private Set<User> users = new HashSet<>();
//Getters & setters...
}

ReunionListener ：

public class ReunionListener {
@PostPersist
public void reunionPostPersist(Reunion ob) {
System.out.println(ob.getUsers().size())
}
}

我在这里获得列表的大小是＆＃34; 0＆＃34;但我确定在联接表中有1个用户，在我的控制器中我有这个：

//Reunion
reunion.getUsers().add(user);
rs.saveReunion(reunion);
System.out.println(rs.getReunion(reunion.getId()).getUsers().size())

在这里，我得到＆＃34; 1＆＃34;

感谢任何帮助。

修改

对于插入，我只是从spring数据jpa实现JpaRepositiry：

DAO：

@Repository
public interface ReunionDAO extends JpaRepository<Reunion, Long> {}

服务：

@Service
@Transactional
public class ReunionServiceImpl implements ReunionService {

@Autowired
private ReunionDAO rDAO;

@Override
public void saveReunion(Reunion r) {

    rDAO.save(r);
}
}

Spring MVC EntityListener：没有来自连接表的数据

0 个答案: