hibernate的基础学习--一对一关联

一对一关系以丈夫和妻子模型

配置文件

妻子配置文件：

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- 映射配置 -->
<hibernate-mapping>
    <class name="hib.po.Wife" table="t_wife">
        <id name="wifeId" column="wife_id">
            <generator class="uuid"></generator>
        </id>
        <property name="wifeName" column="wifename"></property>
    </class>
</hibernate-mapping>

丈夫配置文件

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- 映射配置 -->
<hibernate-mapping>
    <class name="hib.po.Husband" table="t_husband">
        <id name="husId" column="hus_id">
            <generator class="uuid"></generator>
        </id>
        
        <!-- 普通属性和普通字段映射 -->
        <property name="husName" column="husname"></property>
        <!-- 关联关系：和Wife的one2one
            特殊的many2one
         -->
        <many-to-one 
            name="wife"
            class="hib.po.Wife"
            column="wife_id"
            unique="true"
         ></many-to-one>
    </class>
</hibernate-mapping>

测试代码：

/**
 * @author nunu
 * 测试hibernate OneToMany 
 */
public class TestHibernateOneToOne {

    /**
     * 添加数据
     */
    @Test
    public void addUser() {
        SessionFactory sf = H3Util.getSessionFactory();
        Session session = sf.openSession();
        Transaction ts = session.beginTransaction();
        
        Husband hus1 = new Husband(null, "小明", null);
        Husband hus2 = new Husband(null, "小强", null);
        Wife wife1 = new Wife(null, "小花");
        Wife wife2 = new Wife(null, "小丽");
        
        session.save(hus1);
        session.save(hus2);
        session.save(wife1);
        session.save(wife2);
        System.out.println("成功");
        ts.commit();
        session.close();
    }
    
    @Test
    public void updateHusband() {
        SessionFactory sf = H3Util.getSessionFactory();
        Session session = sf.openSession();
        Transaction ts = session.beginTransaction();
        
        Husband hus1 = (Husband) session.get(Husband.class, "4028810a57d16fe00157d16fe3450000");
        Husband hus2 = (Husband) session.get(Husband.class, "4028810a57d16fe00157d16fe3590001");
        
        Wife wife1 = (Wife) session.get(Wife.class, "4028810a57d16fe00157d16fe3590002");
        Wife wife2 = (Wife) session.get(Wife.class, "4028810a57d16fe00157d16fe3590003");

        //维护
        hus1.setWife(wife1);
        hus2.setWife(wife2);

        //update：使用一级缓存中的快照，如果检测没有发生改变，不会发送任何修改语句
        session.update(hus1);
        session.update(hus2);
        
        System.out.println(hus1);
        System.out.println(hus2);
        
        ts.commit();
        session.close();
    }
}