我有一个实体用户:
@Entity
@Table(name = "entity_user")
@AttributeOverride(name = "id", column = @Column(name = "user_id"))
public class User extends BaseObject implements Serializable {
/**
* Login, unique
*/
private String email;
private String username;
/**
* Secret for signing-in
*/
private String password;
/**
* Type of user
*/
private UserType userType;
@OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL})
@JoinTable(name = "view_user_to_requestSet", joinColumns = {
@JoinColumn(name = "user_id")}, inverseJoinColumns = {
@JoinColumn(name = "requestSet_id")})
private Set<RequestSet> setOfRequesSet = new HashSet<>();
@OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL})
@JoinTable(name = "view_user_to_requestSetCreator", joinColumns = {
@JoinColumn(name = "user_id")}, inverseJoinColumns = {
@JoinColumn(name = "requestSet_id")})
private Set<RequestSet> setOfRequesSetCreator = new HashSet<>();
@OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL})
@JoinTable(name = "view_user_to_userTask", joinColumns = {
@JoinColumn(name = "user_id")}, inverseJoinColumns = {
@JoinColumn(name = "userTask_id")})
private Set<UserTask> setOfUserTask = new HashSet<>();
public User() {
}
.
.
..... GET AND SET
基础对象是: @MappedSuperclass public class BaseObject {
@Id
@GeneratedValue
@Column(name = "entity_id")
private Long id;
/**
*
* @return true if the entity hasn't been persisted yet
*/
@Transient
public boolean isNew() {
return id == null;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
问题在于,当我尝试更新对象时,会出现错误:
Exception in thread "Thread-15" org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [UK_5fa729oayn43ynq4v2y4d9qcn]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '5' for key 'UK_5fa729oayn43ynq4v2y4d9qcn'
我使用以下方法来更新实体:
@Transactional
public void save(User value){
em.merge(value);
}
我不知道为什么会出现这个错误,我该如何更新我的对象?谢谢你的帮助。
编辑: 我已经更新:
User u = em.find(persistedType, id); //get user by ID
u.getSetOfRequesSet().add(requestSet); //add one otem to set
userDap.merge(u); //save