Hibernate 一对一外键双向关联

2007-08-22 17:07:23

Hibernate 一对一外键双向关联

一、模型介绍

一个人（Person）对应一个地址（Address）。

二、实体（省略getter、setter方法）

public class Person11fk_sx {
private int personid;
private String name;
private int age;
private Address11fk_sx address11fk_sx;

public class Address11fk_sx {
private int addressid;
private String addressdetail;
private Person11fk_sx person11fk_sx;

三、表模型

mysql> desc person_11fk_sx;
+----------+--------------+------+-----+---------+----------------+
\| Field \| Type \| Null \| Key \| Default \| Extra \|
+----------+--------------+------+-----+---------+----------------+
\| personid \| int(11) \| NO \| PRI \| NULL \| auto_increment \|
\| name \| varchar(255) \| YES \| \| NULL \| \|
\| age \| int(11) \| YES \| \| NULL \| \|
+----------+--------------+------+-----+---------+----------------+
mysql> desc address_11fk_sx;
+---------------+--------------+------+-----+---------+----------------+
\| Field \| Type \| Null \| Key \| Default \| Extra \|
+---------------+--------------+------+-----+---------+----------------+
\| addressid \| int(11) \| NO \| PRI \| NULL \| auto_increment \|
\| addressdetail \| varchar(255) \| YES \| \| NULL \| \|
\| person11fk_sx \| int(11) \| YES \| UNI \| NULL \| \|
+---------------+--------------+------+-----+---------+----------------+

四、生成的SQL脚本

/* Formatted on 2007/08/22 17:15 (QP5 v5.50) */
CREATE TABLE `address_11fk_sx` (
`addressid` int(11) NOT NULL auto_increment,
`addressdetail` varchar(255) default NULL,
`person11fk_sx` int(11) default NULL,
PRIMARY KEY (`addressid`),
UNIQUE KEY `person11fk_sx` (`person11fk_sx`),
KEY `FKF05FC94AAD732F4` (`person11fk_sx`),
CONSTRAINT `FKF05FC94AAD732F4` FOREIGN KEY (`person11fk_sx`) REFERENCES `person_11fk_sx` (`personid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/22 17:16 (QP5 v5.50) */
CREATE TABLE `person_11fk_sx` (
`personid` int(11) NOT NULL auto_increment,
`name` varchar(255) default NULL,
`age` int(11) default NULL,
PRIMARY KEY (`personid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

五、映射方法

<hibernate-mapping>
<class name="com.lavasoft.sx._1_1_fk.Person11fk_sx" table="PERSON_11fk_sx">
<id name="personid">
<generator class="identity"/>
</id>
<property name="name"/>
<property name="age"/>
<one-to-one name="address11fk_sx"
cascade="all"
property-ref="person11fk_sx"/>
</class>
</hibernate-mapping>

<hibernate-mapping>
<class name="com.lavasoft.sx._1_1_fk.Address11fk_sx" table="ADDRESS_11fk_sx">
<id name="addressid">
<generator class="identity"/>
</id>
<property name="addressdetail"/>
<!--unique="true"表示本实体是"1"-->
<many-to-one name="person11fk_sx" unique="true"/>
</class>
</hibernate-mapping>

六、测试方法

public class Test_11fk_sx {
public static void main(String[] args) {
Address11fk_sx add = new Address11fk_sx();
Person11fk_sx p = new Person11fk_sx();

add.setAddressdetail("郑州市经三路");
p.setAge(12);
p.setName("wudalang");

add.setPerson11fk_sx(p);
p.setAddress11fk_sx(add);

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

七、测试结果

1) :正常保存.
session.save(p);

Hibernate: insert into PERSON_11fk_sx (name, age) values (?, ?)
Hibernate: insert into ADDRESS_11fk_sx (addressdetail, person11fk_sx) values (?, ?)

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