我有两个JPA实体(Account和Person),具有双向关系:
@Entity
@Table(name = "ACCOUNTS")
@DataCache(enabled = false)
public class Account
{
....
@ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "ID_OWNER", nullable = false)
private Person owner;
...
}
@Entity
@Table(name = "OWNERS")
@DataCache(enabled = false)
public class Person {
...
@Column(name = "HAS_ACCOUNTS", nullable = false, columnDefinition = "CHAR(1)")
private char hasAccounts;
@OneToMany(mappedBy = "owner")
private Set<Accpunt> comments = new LinkedHashSet<Account>(3);
...
}
当我坚持一个人时,我不想坚持所有帐户,但是当我坚持一个帐户时,我想更新人员属性hasAccounts,所以我还需要更新该人。
我做了以下步骤:
Person p = new Person();
em.persist(p);
Account a = new Account();
a.setOwner(p);
p.setHasAccounts('Y');
em.persist(a);
我得到了这个例外:
javax.ejb.EJBTransactionRolledbackException: org.hibernate.PersistentObjectException: detached entity passed to persist: Person
(我使用带有Hibernate的JPA 1.0)。
答案 0 :(得分:0)
尝试以下方法:
Person p = new Person();
Account a = new Account();
p.getComments().add(a);
p.setHasAccounts('Y');
em.persist(p);