hibernate的基础学习--一对一关联

Posted 2020-08-15 小小暮雨

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>

View Code

 

丈夫配置文件

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <!DOCTYPE hibernate-mapping PUBLIC 
 3     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5 <!-- 映射配置 -->
 6 <hibernate-mapping>
 7     <class name="hib.po.Husband" table="t_husband">
 8         <id name="husId" column="hus_id">
 9             <generator class="uuid"></generator>
10         </id>
11         
12         <!-- 普通属性和普通字段映射 -->
13         <property name="husName" column="husname"></property>
14         <!-- 关联关系：和Wife的one2one
15             特殊的many2one
16          -->
17         <many-to-one 
18             name="wife"
19             class="hib.po.Wife"
20             column="wife_id"
21             unique="true"
22          ></many-to-one>
23     </class>
24 </hibernate-mapping>

View Code

 

测试代码：

 1 /**
 2  * @author nunu
 3  * 测试hibernate OneToMany 
 4  */
 5 public class TestHibernateOneToOne {
 6 
 7     /**
 8      * 添加数据
 9      */
10     @Test
11     public void addUser() {
12         SessionFactory sf = H3Util.getSessionFactory();
13         Session session = sf.openSession();
14         Transaction ts = session.beginTransaction();
15         
16         Husband hus1 = new Husband(null, "小明", null);
17         Husband hus2 = new Husband(null, "小强", null);
18         Wife wife1 = new Wife(null, "小花");
19         Wife wife2 = new Wife(null, "小丽");
20         
21         session.save(hus1);
22         session.save(hus2);
23         session.save(wife1);
24         session.save(wife2);
25         System.out.println("成功");
26         ts.commit();
27         session.close();
28     }
29     
30     @Test
31     public void updateHusband() {
32         SessionFactory sf = H3Util.getSessionFactory();
33         Session session = sf.openSession();
34         Transaction ts = session.beginTransaction();
35         
36         Husband hus1 = (Husband) session.get(Husband.class, "4028810a57d16fe00157d16fe3450000");
37         Husband hus2 = (Husband) session.get(Husband.class, "4028810a57d16fe00157d16fe3590001");
38         
39         Wife wife1 = (Wife) session.get(Wife.class, "4028810a57d16fe00157d16fe3590002");
40         Wife wife2 = (Wife) session.get(Wife.class, "4028810a57d16fe00157d16fe3590003");
41 
42         //维护
43         hus1.setWife(wife1);
44         hus2.setWife(wife2);
45 
46         //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
47         session.update(hus1);
48         session.update(hus2);
49         
50         System.out.println(hus1);
51         System.out.println(hus2);
52         
53         ts.commit();
54         session.close();
55     }
56 }