Question

面对将实体插入数据库的问题。我正在使用Hibernate JPA。

我有表Reminder和ReminderAction，每个Reminder将保持ReminderAction的当前状态（即OneToOne）和交易结束，每个Reminder将有许多ReminderActions（具有不同的状态）。

DB Table columns are

REMINDER --> REMINDER_ID (PK), CURRENT_ACTION_ID (FK)...
REMINDER_ACTION --> REMINDER_ACTION_ID (PK), REMINDER_ID (FK)...


Reminder Entity
---------------------

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "REMINDER_SEQ_STORE")
@Column(name = "REMINDER_ID", unique = true, nullable = false, precision = 22, scale = 0)
public Integer getReminderId() {
return reminderId;
}



@OneToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL, targetEntity = ReminderAction.class)
@JoinColumn(name = "CURRENT_ACTION_ID")
public ReminderAction getCurrentAction() {
return currentAction;
}


ReminderAction Entity
---------------------

@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="REMINDER_ACTION_SEQ_STORE")
@Column(name = "REMINDER_ACTION_ID", unique = true, nullable = false)
public Integer getReminderActionId() {
return reminderActionId;
}


@ManyToOne(cascade=CascadeType.ALL,targetEntity=Reminder.class)
@JoinColumn(name="REMINDER_ID")
public Reminder getReminder() {
return reminder;
}


DAO
---

public void saveOrUpdate(final E transientObject) {
getCurrentSession().saveOrUpdate(transientObject);
getCurrentSession().flush();
}

在saveOrUpdate期间，hibernate从DB获取Reminder和ReminderAction的序列

Hibernate: select REMINDER_SEQ.nextval from dual
Hibernate: select REMINDER_ACTION_SEQ.nextval from dual

但是在flush（）期间， hibernate尝试首先插入ReminderAction 并且由于ReminderAction中的ReminderID为null，因此违反了 ORA-02291：完整性约束（REMINDER_ACTION_FK） - 未找到父键

因为DB中的触发器而引用了线程和问题。 但是我在DB中没有Reminder和Reminder_Action表的任何触发器。

JPA Bidirectional One to Many Foreign Key Issues
Integrity constraint violated just when I commit the transaction
Hibernate: Insert issue - Parent Key not found

如何让hibernate首先插入Reminder然后再插入ReminderAction？

更新

我尝试从Reminder和ReminderAction中删除SequenceGenerator并在saveOrUpdate期间手动设置ID并以相同的异常结束

Reminder rem = (Reminder)transientObject;
rem.getCurrentAction().setReminderId(5);
rem.getCurrentAction().setReminderActionId(5);
rem.setReminderId(5);

getCurrentSession().saveOrUpdate(transientObject);
getCurrentSession().flush();



Hibernate: insert into REMINDER_ACTION (REMINDER_ID, REMINDER_ACTION_ID) values (?, ?)
binding parameter [1] as [INTEGER] - 5
binding parameter [2] as [INTEGER] - 5
SQL Error: 2291, SQLState: 23000
ORA-02291: integrity constraint (REMINDER_ACTION_FK) violated - parent key not found

非常感谢任何帮助。感谢。

Answer 1

我正在回答您的问题，并将其置于一个专门的答案中：

将Reminder中的ReminderAction设置为nullable = true并将ReminderAction中的Reminder提升为nullable = false

Reminder Entity
---------------

@OneToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL, targetEntity = ReminderAction.class)
@JoinColumn(name = "CURRENT_ACTION_ID", nullable=true)
public ReminderAction getCurrentAction() {
return currentAction;
}

ReminderAction Entity
---------------------
@ManyToOne(cascade=CascadeType.ALL,targetEntity=Reminder.class)
@JoinColumn(name="REMINDER_ID", nullable=false)
public Reminder getReminder() {
return reminder;
}

执行此休眠将首先插入Reminder然后再插入ReminderAction。感谢

违反了完整性约束 - 未找到父密钥 - OneToOne和ManyToOne

1 个答案: