|
Hibernate 一对多连接表单向关联
|
|
|
|
|
|
一、模型介绍
|
|
|
|
一个人（Person）对应多个地址（Address），比如家庭地址、公司地址。
|
|
|
|
二、实体（省略getter、setter方法）
|
|
|
|
public class Person1ntab {
|
|
private int personid;
|
|
private String name;
|
|
private int age;
|
|
private Set addresses=new HashSet();
|
|
|
|
public class Address1nfk implements Serializable {
|
|
private int addressid;
|
|
private String addressdetail;
|
|
|
|
三、表模型
|
|
|
|
mysql> desc join_1ntab;
|
|
+-----------+---------+------+-----+---------+-------+
|
|
| Field | Type | Null | Key | Default | Extra |
|
|
+-----------+---------+------+-----+---------+-------+
|
|
| personid | int(11) | NO | PRI | | |
|
|
| addressid | int(11) | NO | PRI | | |
|
|
+-----------+---------+------+-----+---------+-------+
|
|
|
|
mysql> desc person_1ntab;
|
|
+----------+--------------+------+-----+---------+----------------+
|
|
| 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_1ntab;
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
| Field | Type | Null | Key | Default | Extra |
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
| addressid | int(11) | NO | PRI | NULL | auto_increment |
|
|
| addressdetail | varchar(255) | YES | | NULL | |
|
|
+---------------+--------------+------+-----+---------+----------------+
|
|
|
|
四、生成的SQL脚本
|
|
|
|
/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */
|
|
CREATE TABLE `address_1ntab` (
|
|
`addressid` int(11) NOT NULL auto_increment,
|
|
`addressdetail` varchar(255) default NULL,
|
|
PRIMARY KEY (`addressid`)
|
|
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=gbk;
|
|
|
|
/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */
|
|
CREATE TABLE `join_1ntab` (
|
|
`personid` int(11) NOT NULL,
|
|
`addressid` int(11) NOT NULL,
|
|
PRIMARY KEY (`personid`,`addressid`),
|
|
UNIQUE KEY `addressid` (`addressid`),
|
|
KEY `FK6B6078C3C8DF5BFF` (`personid`),
|
|
KEY `FK6B6078C3C2B11347` (`addressid`),
|
|
CONSTRAINT `FK6B6078C3C2B11347` FOREIGN KEY (`addressid`) REFERENCES `address_1ntab` (`addressid`),
|
|
CONSTRAINT `FK6B6078C3C8DF5BFF` FOREIGN KEY (`personid`) REFERENCES `person_1ntab` (`personid`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=gbk;
|
|
|
|
/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */
|
|
CREATE TABLE `person_1ntab` (
|
|
`personid` int(11) NOT NULL auto_increment,
|
|
`name` varchar(255) default NULL,
|
|
`age` int(11) default NULL,
|
|
PRIMARY KEY (`personid`)
|
|
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;
|
|
|
|
|
|
五、映射方法
|
|
|
|
<hibernate-mapping>
|
|
<class name="com.lavasoft.dx._1_n_tab.Person1ntab" table="PERSON_1ntab">
|
|
<id name="personid">
|
|
<generator class="identity"/>
|
|
</id>
|
|
<property name="name"/>
|
|
<property name="age"/>
|
|
<!--映射集合属性，join_1ntab是连接表表名-->
|
|
<set name="addresses"
|
|
table="join_1ntab"
|
|
>
|
|
<!--“column="personid"”确定PERSON_1ntab表关联到连接表的外键列名-->
|
|
<key column="personid"/>
|
|
<!--“column="addressid"”关联PERSON_1ntab表的Address1ntab对象的id在连接表中的列名-->
|
|
<!--“unique="true"表示1-N，Person1ntab是1，Address1ntab是多”-->
|
|
<many-to-many
|
|
column="addressid"
|
|
unique="true"
|
|
class="com.lavasoft.dx._1_n_tab.Address1ntab"/>
|
|
</set>
|
|
</class>
|
|
</hibernate-mapping>
|
|
|
|
<hibernate-mapping>
|
|
<class name="com.lavasoft.dx._1_n_tab.Address1ntab" table="ADDRESS_1ntab">
|
|
<id name="addressid">
|
|
<generator class="identity"/>
|
|
</id>
|
|
<property name="addressdetail"/>
|
|
</class>
|
|
</hibernate-mapping>
|
|
|
|
|
|
六、测试方法
|
|
|
|
public class Test_1ntab {
|
|
public static void main(String[] args){
|
|
Address1ntab add1=new Address1ntab();
|
|
Address1ntab add2=new Address1ntab();
|
|
Address1ntab add3=new Address1ntab();
|
|
Person1ntab p1=new Person1ntab();
|
|
Person1ntab p2=new Person1ntab();
|
|
|
|
add1.setAddressdetail("郑州市经三路");
|
|
add2.setAddressdetail("合肥市宿州路");
|
|
add3.setAddressdetail("北京市长安路");
|
|
p1.setName("wang");
|
|
p1.setAge(30);
|
|
p2.setName("lee");
|
|
p2.setAge(50);
|
|
|
|
p1.getAddresses().add(add1);
|
|
p1.getAddresses().add(add2);
|
|
//p2.getAddresses().add(add2);
|
|
p2.getAddresses().add(add3);
|
|
|
|
Session session= HibernateUtil.getCurrentSession();
|
|
Transaction tx=session.beginTransaction();
|
|
session.save(add1);
|
|
session.save(add2);
|
|
session.save(add3);
|
|
session.save(p1);
|
|
session.save(p2);
|
|
tx.commit();
|
|
HibernateUtil.closeSession();
|
|
}
|
|
}
|
|
|
|
七、测试结果
|
|
|
|
1) :正常保存.
|
|
session.save(add1);
|
|
session.save(add2);
|
|
session.save(add3);
|
|
session.save(p1);
|
|
session.save(p2);
|
|
Hibernate: insert into PERSON_1nfk (name, age) values (?, ?)
|
|
Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)
|
|
Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)
|
|
Hibernate: update ADDRESS_1nfk set personid=? where addressid=?
|
|
Hibernate: update ADDRESS_1nfk set personid=? where addressid=?
|
|
|
|
|
附件：http://down.51cto.com/data/2348391
本文转自 leizhimin 51CTO博客，原文链接：http://blog.51cto.com/lavasoft/39318，如需转载请自行联系原作者