package com.bjsxt.hibernate;
import org.hibernate.Session;
import junit.framework.TestCase;
public class One2OneTest extends TestCase {
public void testSave1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
IdCard idCard = new IdCard();
idCard.setCardNo("88888888888888");
Person person = new Person();
person.setName("孫悟空");
person.setIdCard(idCard);
//不會出現TransientObjectException異常
//因為一對一主鍵關聯映射中，預設了cascade屬性
session.save(person);
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testLoad1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
Person person = (Person)session.load(Person.class, 1);
System.out.println("person.name=" + person.getName());
System.out.println("idCard.cardNo=" + person.getIdCard().getCardNo());
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testLoad2() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
IdCard idCard = (IdCard)session.load(IdCard.class, 1);
System.out.println("idcard.cardNo=" + idCard.getCardNo());
System.out.println("idcard.person.name=" + idCard.getPerson().getName());
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
}
--------------------------------------------------
hibernate一對一主鍵關聯映射（雙向關聯Person<---->IdCard）
//需要在idcard映射檔案中加入<one-to-one>标簽指向person:<one-to-one name="person"/>，
//訓示hibernate如何加載person預設根據主鍵加載
<hibernate-mapping>
<class name="com.bjsxt.hibernate.IdCard" table="t_idcard">
<id name="id">
<generator class="native"/>
</id>
<property name="cardNo"/>
<one-to-one name="person"/>
</class>
</hibernate-mapping>
create table t_idcard (id integer not null auto_increment, cardNo varchar(255), primary key (id))
create table t_person (id integer not null, name varchar(255), primary key (id))
alter table t_person add index FK785BED809AC0D5D6 (id), add constraint FK785BED809AC0D5D6 foreign key (id) references t_idcard (id)
mysql> desc t_idcard;
+--------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| cardNo | varchar(255) | YES | | NULL | |
+--------+--------------+------+-----+---------+----------------+
2 rows in set (0.14 sec)
mysql> desc t_person;
+-------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| name | varchar(255) | YES | | NULL | |
+-------+--------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
TestSave：
Hibernate: insert into t_idcard (cardNo) values (?)
Hibernate: insert into t_person (name, id) values (?, ?)
TestLoaded1：
Hibernate: select person0_.id as id1_0_, person0_.name as name1_0_ from t_person person0_ where person0_.id=?
person.name=孫悟空
Hibernate: select idcard0_.id as id0_1_, idcard0_.cardNo as cardNo0_1_, person1_.id as id1_0_, person1_.name as name1_0_ from t_idcard idcard0_ left outer join t_person person1_ on idcard0_.id=person1_.id where idcard0_.id=?
idCard.cardNo=88888888888888
TestLoaded2：
Hibernate: select idcard0_.id as id0_1_, idcard0_.cardNo as cardNo0_1_, person1_.id as id1_0_, person1_.name as name1_0_ from t_idcard idcard0_ left outer join t_person person1_ on idcard0_.id=person1_.id where idcard0_.id=?
idcard.cardNo=88888888888888
idcard.person.name=孫悟空