Hibernate 一对一连接表单向关联

public class Person11tab {
private int personid;
private String name;
private int age;
private Address11tab address11tab;

public class Address11tab {
private int addressid;
private String addressdetail;

<!--使用join元素显式确定链接表-->
<join table="join_11tab">
<key column="personid"/>
<!--映射1-1关联属性，其中unique=“true”属性确定为“1-1”-->
<many-to-one name="address11tab" unique="true"/>
</join>

<hibernate-mapping>
<class name="com.lavasoft.dx._1_1_tab.Person11tab" table="PERSON_11tab">
<id name="personid">
<generator class="identity"/>
</id>
<property name="name"/>
<property name="age"/>
<!--使用join元素显式确定链接表-->
<join table="join_11tab">
<key column="personid"/>
<!--映射1-1关联属性，其中unique=“true”属性确定为“1-1”-->
<many-to-one name="address11tab" unique="true"/>
</join>
</class>
</hibernate-mapping>

<hibernate-mapping>
<class name="com.lavasoft.dx._1_1_tab.Address11tab" table="ADDRESS_11tab">
<id name="addressid">
<generator class="identity"/>
</id>
<property name="addressdetail"/>
</class>
</hibernate-mapping>

public class Test_11tab {
public static void main(String[] args){
Person11tab p1=new Person11tab();

p1.setAge(21);
p1.setName("p1");

Address11tab add1=new Address11tab();
add1.setAddressdetail("郑州市经三路");

p1.setAddress11tab(add1);

Session session= HibernateUtil.getCurrentSession();
Transaction tx=session.beginTransaction();
session.save(add1);
session.save(p1);
tx.commit();
HibernateUtil.closeSession();
}
}

1) :正常保存. 推荐这么干!
session.save(add1);
session.save(p1);

Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)
Hibernate: insert into PERSON_11tab (name, age) values (?, ?)
Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)

2) :正常保存.
session.save(p1);
session.save(add1);

Hibernate: insert into PERSON_11tab (name, age) values (?, ?)
Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)
Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)
Hibernate: update join_11tab set address11tab=? where personid=?

3) :正常保存.
//        session.save(p1);
session.save(add1);

Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)

4) : 发生异常,不能保存.
session.save(p1);
//        session.save(add1);

Hibernate: insert into PERSON_11tab (name, age) values (?, ?)
Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)
Exception in thread "main" org.hibernate.TransientObjectException: com.lavasoft.dx._1_1_tab.Address11tab

_1_1_tab