Hibernate基于主键的一对一映射关系

<strong><span style="font-size:18px;"><span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">Hibernate中，一对一的映射关系有两种，一种是基于外键的一种是基于外键的，下面我来介绍一中基于主键的方式</span></span></strong>

<strong><span style="font-size:18px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.seven.domain">

<class name="IdCard" table="t_idCard">
<!-- 主键 -->
<id name="id" column="id">
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>

<property name="number"/>
<!-- person属性，本方有外键 -->
<one-to-one name="person" class="Person" constrained="true"></one-to-one>
</class>

</hibernate-mapping></span></strong>

<strong><span style="font-size:18px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.seven.domain">

<class name="Person" table="t_person">
<!-- 主键 -->
<id name="id" column="id">
<generator class="native"/>
</id>

<property name="name"/>
<!-- idCard属性，本方无外键 -->
<one-to-one name="idCard" class="IdCard"></one-to-one>
</class>

</hibernate-mapping></span></strong>

<strong><span style="font-size:18px;">package com.seven.domain;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

public class App {
private static SessionFactory sessionFactory = new Configuration()
.configure()//
.addClass(IdCard.class)//
.addClass(Person.class)//
.buildSessionFactory();
@Test
public void testSave(){
Session session = sessionFactory.openSession();
session.beginTransaction();

Person person = new Person();
person.setName("lkk");
IdCard idCard = new IdCard();
idCard.setNumber("32321321321");
//关联
person.setIdCard(idCard);
idCard.setPerson(person);
//保存
session.save(person);
session.save(idCard);

session.getTransaction().commit();
session.close();
}
}</span></strong>

其中t_person 表中有一个主键和name字段，无外外键