<分区>
Possible Duplicate:
Hibernate: different object with the same identifier value was already associated with the session
当我想使用 hibernate 更新我的对象到数据库时遇到问题 当我想要更新时(branchDao.update(be)； ) 它抛出以下异常
a different object with the same identifier value was already associated with the session
这是我的代码:
LoginEntity le = loginDao.getSpecificLogin(pkId);
le.setPassword(password);
le.setRoles(role);
loginDao.update(le);
HumanEntity he = humanDao.getHumanById(humanID); // humanEntuty farde morede nazar ro bar hasbe Email taraf load mikonad
he.setHumanEmail(oemail);
he.setHumanFamily(olname);
he.setHumanName(ofname);
humanDao.update(he);
superBranchUsername = branch.getFatherUsername();
int superBranchId = branchDao.getBranchIdByUserName(superBranchUsername);
BranchEntity superBranch = branchDao.load(superBranchId);
BranchEntity be = new BranchEntity();
setBranchEntity(be, he, pkId, bname, confirmed, level, studentCount, uname, superBranch, le);
branchDao.update(be); //this line throw exception
和更新:
public void update(T transientObject) throws DatabaseException {
Session s = HibernateUtil.getSession();
Transaction tx = null;
try {
tx = s.beginTransaction();
s.update(transientObject);
s.flush();
tx.commit();
} catch (HibernateException e) {
System.out.println(e.getMessage());
tx.rollback();
e.printStackTrace();
throw new DatabaseException("cant't update object");
}
}
这是我的 BranchEntity 类
@Entity
@Table(name = "branch", uniqueConstraints = {@UniqueConstraint(columnNames = {"bname", "branch_fk"})})
public class BranchEntity implements Serializable {
@Id
@GeneratedValue
private int id;
@Column(name = "username", length = 64, nullable = false)
private String userName;
@Column(name = "bname", length = 64)
private String branchName;
@Column(name = "studcount")
private int studCount;
@Column(name = "blevel", columnDefinition = "int default 0")
private int level;
@Column(name = "confirmed", columnDefinition = "tinyint default 0")
private int confirmed;
@OneToMany(mappedBy = "branch", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@OnDelete(action = OnDeleteAction.CASCADE)
@Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
private Set<BranchBuildingEntity> branchbuilding = new HashSet<BranchBuildingEntity>();
@OneToMany(mappedBy = "branch", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@OnDelete(action = OnDeleteAction.CASCADE)
@Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
private Set<BranchPictureEntity> branchPicture = new HashSet<BranchPictureEntity>();
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "login_fk", nullable = true)
private LoginEntity login;
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "human_fk", nullable = true)
private HumanEntity human;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinColumn(name = "branch_fk", referencedColumnName = "id", nullable = true)
private BranchEntity superBranch;
有些地方我读到这个问题是因为我使用 @Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN) 但是当我需要级联时我应该做什么？