使用ORA-02291错误HibernateOneToMany

Question

我有一个问题，当坚持一个实体和它的孩子在一对多的关系。这里我的两个实体：

@Entity
@Table(name="USER")
public class User implements Serializable {
  ...
  @Id
  @Column(name="ID_USER")
  private String idUser;

  @OneToMany(mappedBy="user", cascade=CascadeType.PERSIST)
  private List<Address> address;

  public List<Address> getAddress() {
     return this.address;
  }

  public void setAddress(List<Address> address) {
     this.address = address;
  }

  public Address addAddress(Address address) {
     getAddress().add(address);
     address.setUser(this);

     return address;
  }

  public Address removeAddress(Address address) {
     getAddress().remove(address);
     address.setUser(null);

     return address;
  }
  ...
}

@Entity
@Table(name="ADDRESS")
public class Address implements Serializable {
    ...


   @EmbeddedId
   private AddressPK id;

    @ManyToOne(cascade = CascadeType.PERSIST)
    @JoinColumn(name="ID_USER", insertable=false, updatable=false, nullable=false)
    private User user;

    public User getUser() {
        return this.user;
    }

    public void setUser(User user) {
        this.user = user;
    }
}

@Embeddable
public class AddressPK implements Serializable {
   ...
   @Column(name="ID_USER", insertable=false, updatable=false)
   private String idUser;
   ...
}

现在是生成ORA-02291错误的持久化操作：

User u = new User();
u.setAddress(new ArrayList<Address>());

u.set...

Address a1 = new Address();
a1.set...
u.addAddress(a1);

Address a2 = new Address();
a2.set...
u.addAddress(a2);

entityManager.persist(u);

有办法解决这个问题吗？

谢谢大家！

Answer 1

从昨天起我就陷入了这个困境，但现在我找到了解决问题的办法。在我的例子中，错误是因为我有触发器来设置我的_序列。下一步为其各自实体表的主键。

然后，解决方案将更改触发器以验证：new。实体的PK为空以设置它。相反，如果它不是空的，则可以理解该序列是由JPA设置为PK的。例如：

create or replace TRIGGER "MYSCHEMA"."TGR_MYTABLE_INSERT"
  before insert on MYTABLE
  for each row
  begin
  if :new.PK_MYTABLE is null then
    select SEQ_MYTABLE.nextval
    into :new.PK_MYTABLE
    from dual;
  end if;
  end;

Answer 2

我认为您需要删除地址表中@JoinColumn to的name属性

@Entity
@Table(name="ADDRESS")
public class Address implements Serializable {
...
@ManyToOne(cascade = CascadeType.PERSIST)
@JoinColumn(insertable=false, updatable=false)
private User user;

public User getUser() {
    return this.user;
}

public void setUser(User user) {
    this.user = user;
}

}

您已经从用户端获得了mappedBy=“user”。