|
Hibernate
一对多外键双向关联
|
|
|
|
一、模型介绍
|
|
|
|
一个人（Person）对应多个地址（Address）。
|
|
|
|
二、实体（省略getter、setter方法）
|
|
|
|
public class Person1nfk_sx implements Serializable {
|
|
private int personid;
|
|
private String name;
|
|
private int age;
|
|
private Set addresses=new HashSet();
|
|
|
|
public class Address1nfk_sx implements Serializable {
|
|
private int addressid;
|
|
private String addressdetail;
|
|
private Person1nfk_sx person1nfkSx;
|
|
|
|
三、表模型
|
|
|
|
mysql> desc person_1nfk_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_1nfk_sx;
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
| Field | Type | Null | Key | Default | Extra |
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
| addressid | int(11) | NO | PRI | NULL | auto_increment |
|
|
| addressdetail | varchar(255) | YES | | NULL | |
|
|
| personid | int(11) | NO | MUL | | |
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
|
|
四、生成的SQL脚本
|
|
|
|
/* Formatted on 2007/08/22 17:42 (QP5 v5.50) */
|
|
CREATE TABLE `address_1nfk` (
|
|
`addressid` int(11) NOT NULL auto_increment,
|
|
`addressdetail` varchar(255) default NULL,
|
|
`personid` int(11) default NULL,
|
|
PRIMARY KEY (`addressid`),
|
|
KEY `FK9B93456DA6D6C1F5` (`personid`),
|
|
CONSTRAINT `FK9B93456DA6D6C1F5` FOREIGN KEY (`personid`) REFERENCES `person_1nfk` (`personid`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=gbk;
|
|
|
|
|
|
/* Formatted on 2007/08/22 17:42 (QP5 v5.50) */
|
|
CREATE TABLE `person_1nfk` (
|
|
`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_n_fk.Person1nfk_sx" table="PERSON_1nfk_sx">
|
|
<id name="personid">
|
|
<generator class="identity"/>
|
|
</id>
|
|
<property name="name"/>
|
|
<property name="age"/>
|
|
<!--
映射集合属性，关联到持久化类-->
|
|
<set name="addresses" inverse="true" cascade="all">
|
|
<!--column
用于指定外键列名-->
|
|
<key column="personid" not-null="true"/>
|
|
<!--
映射关联类-->
|
|
<one-to-many class="com.lavasoft.sx._1_n_fk.Address1nfk_sx"/>
|
|
</set>
|
|
</class>
|
|
</hibernate-mapping>
|
|
|
|
<hibernate-mapping>
|
|
<class name="com.lavasoft.sx._1_n_fk.Address1nfk_sx" table="ADDRESS_1nfk_sx">
|
|
<id name="addressid">
|
|
<generator class="identity"/>
|
|
</id>
|
|
<property name="addressdetail"/>
|
|
<!--
映射关联属性，column属性指定外键列名-->
|
|
<many-to-one name="person1nfk"
|
|
class="com.lavasoft.sx._1_n_fk.Person1nfk_sx"
|
|
fetch="select"
|
|
cascade="save-update">
|
|
<column name="personid" not-null="true"/>
|
|
</many-to-one>
|
|
</class>
|
|
</hibernate-mapping>
|
|
|
|
六、测试方法
|
|
|
|
public class Test_1nfk_sx {
|
|
public static void main(String[] args){
|
|
Address1nfk_sx add1=new Address1nfk_sx();
|
|
Address1nfk_sx add2=new Address1nfk_sx();
|
|
Person1nfk_sx p=new Person1nfk_sx();
|
|
|
|
add1.setAddressdetail("
郑州市经三路");
|
|
add2.setAddressdetail("
合肥市宿州路");
|
|
p.setName("wang");
|
|
p.setAge(30);
|
|
|
|
p.getAddresses().add(add1);
|
|
p.getAddresses().add(add2);
|
|
add1.setPerson1nfk(p);
|
|
add2.setPerson1nfk(p);
|
|
|
|
Session session= HibernateUtil.getCurrentSession();
|
|
Transaction tx=session.beginTransaction();
|
|
session.save(p);
|
|
session.saveOrUpdate(add1);
|
|
session.saveOrUpdate(add2);
|
|
tx.commit();
|
|
HibernateUtil.closeSession();
|
|
}
|
|
}
|
|
|
|
七、测试结果
|
|
|
|
1) :
正常保存.
|
|
session.save(p);
|
|
session.saveOrUpdate(add1);
|
|
session.saveOrUpdate(add2);
|
|
|
|
Hibernate: insert into PERSON_1nfk_sx (name, age) values (?, ?)
|
|
Hibernate: insert into ADDRESS_1nfk_sx (addressdetail, personid) values (?, ?)
|
|
Hibernate: insert into ADDRESS_1nfk_sx (addressdetail, personid) values (?, ?)
|
|
|
|
|
|
|
本文转自 leizhimin 51CTO博客，原文链接：http://blog.51cto.com/lavasoft/39336，如需转载请自行联系原作者
![【框架】[Hibernate]利用Hibernate进行一对多的级联操作-Web实例](https://ucc.alicdn.com/pic/developer-ecology/6fb9194b56bf4729af8285684a941c0e.png?x-oss-process=image/resize,h_160,m_lfit)
