JPA双向一对多外键问题

我有两个实体Person和Order由JPA/Hibernate Entity Manager管理。我试图通过注释他们创造一个双向一到两个实体来说之间一对多的关系如下：JPA双向一对多外键问题

人：

@Id 
@Column(name="PERSON_ID") 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "PERSON_SEQ") 
@SequenceGenerator(name = "PERSON_SEQ", sequenceName = "PERSON_SEQ") 
private Integer personId; 

@OneToMany(mappedBy="person", cascade=CascadeType.ALL) 
private List<Order> orders = new ArrayList<Order>(); 

public void addOrder(Order o) 
{ 
    getOrders().add(o); 
    o.setPerson(this); 
}

订单：

@ManyToOne 
@JoinColumn(name="PERSON_ID") 
private Person person;

我再测试代码：

@Test 
@Transactional 
@Rollback(value=false) 
public void populateTable() { 
    WatchUtil.startTask("Persist Person"); 

    for (int i = 0; i < 25; i++) { 
     Person tmpPerson= new Person(); 
     tmpPerson.setName("Person1"); 
     Order order = new Order(); 
     order.setOrderNumber("Order1"); 
     tmpPerson.addOrder(order); 
     dao.persist(tmpPerson); //calls entitymanager.persist(); does not call flush 
    } 
    WatchUtil.endTask(); 
}

这给了我一个约束例外：

2011-04-19 06:25:12,713 INFO [org.springframework.test.context.transaction.TransactionalTestExecutionListener] - <Began transaction (9): transaction manager [[email protected]]; rollback [false]> 
2011-04-19 06:25:12,713 DEBUG [org.hibernate.SQL] - <insert into PERSON (PERSON_ID, NAME) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)> 
2011-04-19 06:25:12,775 DEBUG [org.hibernate.SQL] - <insert into ORDER (ORDER_NUMBER PERSON_ID, ORDER_ID) values (?, ?, ?, ?, ?, ?)> 
2011-04-19 06:25:12,947 WARN [org.hibernate.util.JDBCExceptionReporter] - <SQL Error: 2291, SQLState: 23000> 
2011-04-19 06:25:12,947 ERROR [org.hibernate.util.JDBCExceptionReporter] - <ORA-02291: integrity constraint (BLUE_SITE.FKE2BCFD5374D88D96) violated - parent key not found> 
2011-04-19 06:25:12,947 WARN [org.hibernate.util.JDBCExceptionReporter] - <SQL Error: 2291, SQLState: 23000> 
2011-04-19 06:25:12,947 ERROR [org.hibernate.util.JDBCExceptionReporter] - <ORA-02291: integrity constraint (BLUE_SITE.FKE2BCFD5374D88D96) violated - parent key not found> 
2011-04-19 06:25:12,947 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] - <Could not synchronize database state with session> 
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update 
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94) 
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275) 
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266) 
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167) 
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) 
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) 
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027) 
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:304) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) 
    at $Proxy32.flush(Unknown Source) 
    at test.JpaDao.persist(JpaDao.java:37) 
    at test.PersonJpaDaoTests.populateTable(MemberJpaDaoTests.java:156) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) 
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) 
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) 
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 
Caused by: java.sql.BatchUpdateException: ORA-02291: integrity constraint (BLUE_SITE.FKE2BCFD5374D88D96) violated - parent key not found 
    at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:367) 
    at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:9119) 
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70) 
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268) 
    ... 44 more 
StopWatch '-- DEBUGGING --': running time (millis) = 0

收到此错误后，我从数据库中删除约束。然而，两张表都填充了父母和孩子之间的密钥错位。任何人都可以引导我走向正确的方向吗？我查看了一堆帖子，他们声称创建一个像Person.addOrder（Order o）这样的方法应该处理一些事情。

注意到我正在使用Oracle序列来生成我的ID也很重要。我也为每个类创建了hashCode和Equals方法。

来源

2011-04-19 Kevin Bowersox

'addOrder（）'应该调用'setPerson（）'，但它调用'setMember（）' - 是否是一个错字？ – axtavt 2011-04-19 11:29:56

好赶上axtavt。我不得不简化我的发帖示例，我一定错过了。 – 2011-04-19 11:49:32

我发现了这个问题。 PERSON表上有一个从不同序列插入的触发器。这导致订单中的Foriegn密钥未对齐。我不知道触发器是如何到达那里的，但我怀疑它可能是通过自动DDL生成的，我可能忘记了我做了它或可疑的DBA j/k。我读了另一篇文章，有人有这个问题，并没有点击，因为我不相信我有触发器。如果你有同样的问题，我会建议检查触发器以防万一。 – 2011-04-19 11:50:41

我在查看数据库中的对象后发现问题。在我的项目的初始设置过程中，我没有使用序列，但是我已经自动生成DDL开启。这在数据库中创建了一个触发器。

过了一段时间，我决定使用一个序列。包含序列的新配置与旧触发器冲突，产生约束错误。一旦我删除这些触发器，异常就消失了。

来源

2012-08-08 16:05:32

JPA双向一对多外键问题

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