我有两个表,其中有一个OneToMany,MnatToOne关系。休眠JPA值删除OneToMany关系
当我将AlarmnotifyEmailEntity的实例添加到alarmnotifyEmailEntityList对象中并更新AlarmnotifyEmailConfEntity的实例时,值会正确保存到数据库中。
Bu删除了alarmnotifyEmailEntityList的一个项目时,我无法做同样的事情。 我肯定值从alarmnotifyEmailEntityList删除,但它并没有反映这种变化成数据库
@Entity(name ="alarmnotify_email_conf")
@Table(name = "alarmnotify_email_conf")
public class AlarmnotifyEmailConfEntity implements Serializable {
@OneToMany(mappedBy = "alarmnotifyEmailConfRef",cascade=CascadeType.ALL)
private List<AlarmnotifyEmailEntity> alarmnotifyEmailEntityList;
}//end of Class
@Entity (name ="alarmnotify_email")
@Table(name = "alarmnotify_email")
public class AlarmnotifyEmailEntity implements Serializable {
@JoinColumn(name = "alarmnotify_email_conf_ref", referencedColumnName = "id")
@ManyToOne
private AlarmnotifyEmailConfEntity alarmnotifyEmailConfRef;
}end of Class
我只是调用下面的语句进行更新。
JPAManager.getJPAManagerInstance()。update(alarmnotifyemailconf);
public Object update(Object o) {
try {
tx.begin();
EntityManager em = getEntityManager();
System.out.println("updating object:" + o);
o = em.merge(o);
em.close();
tx.commit();
System.out.println("closed and commited merge operation");
return o;
}
catch (Exception e) {
e.printStackTrace();
}
return o;
}
你有没有尝试添加级联= CascadeType.ALL的关系@ManyToOne的一面呢? – Asymmetric33
如果@ManyToOne具有CascadeType.All,则触发删除AlarmnotifyEmailConfEntity实例。但我不想要这个操作。 –