hibernate中一对一外键双向关联插入时违反非空约束如何解决？

Question

作了个测试，一直都是违反非空约束，请帮忙看一下。
我的两张表wife和husband都是有外键参照对方主键，而且外键都有非空约束。建立起的是基于外键一对一双向关联，但我在向表中插入Wife对象时，显示husband_id违反非空约束。请问这应该怎么解决呢？

异常如下：
[code="java"]org.hibernate.exception.ConstraintViolationException: could not insert: [com.zyh.hibernate.domain.Wife]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:40)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2158)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2638)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at com.zyh.hibernate.persist.BaseDaoImpl.insert(BaseDaoImpl.java:39)
at com.zyh.hibernate.web.TestOne2One.test1(TestOne2One.java:37)
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.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.sql.SQLException: Column 'husband_id' cannot be null
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2975)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1600)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1125)
at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:677)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1357)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1274)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1259)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:73)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:33)
... 37 more
[/code]

两个实体类如下（get和set方法就不贴了）：
[code="java"]public class Husband {

private Integer id;
private String name;
private Date birth;
private Wife wife;

}

public class Wife{

private Integer id;
private String name;
private Date birth;
private Husband husband;

}[/code]

husband.hbm.xml:

[code="java"]









[/code]

wife.hbm.xml:
[code="java"]






column="husband_id" unique="true" />

[/code]

测试代码：

[code="java"]@Test
public void test1() {

    Husband h = new Husband();
    h.setName("张三");
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    Wife w = new Wife();
    w.setName("李丽");
    try {
        h.setBirth(sdf.parse("1986-11-28"));
        w.setBirth(sdf.parse("1988-03-15"));
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    //h.setWife(w);

    //new HusbandDaoImpl().insert(h);

    w.setHusband(h);
    new WifeDaoImpl().insert(w);
}[/code]

[b]问题补充：[/b]
感谢回答，可是one-to-one结点里并没有inverse属性啊！

Answer 1

[quote]
你这应该是基于主键关联的一对一吧，可我做的是基于外键的啊！我的wife和husband两张表的id都是独立的，如果不改变表结构，有办法解决吗？
另外，基于外键的一对一，不也是一对多的一个特例吗？
[/quote]

收到你短信了，还是发这里吧。
ID独立是一样的，我使用ID作为外键只不过是为了节省列，你要额外单独提供一个列的话一样的道理。你只需要两边都配one-to-one,many-to-one里通过column来指定外键列，one-to-one的话要用foreign-key=""。填上对应的外键列即可，比如在wife里填husband，husband里填wife。

这种方式我以前好像也用过，有些印象，你可以试试。