摘自:http://lavasoft.blog.51cto.com/62575/39344
一、模型介绍
多个人(Person)对应多个地址(Address)。
一个人可对应多个地址,一个地址也可以对应多个人。
二、实体(省略getter、setter方法)
public class Personnn_sx {
private int personid;
private String name;
private int age;
private Set addresses=new HashSet();
public class Addressnn_sx {
private int addressid;
private String addressdetail;
private Set persons = new HashSet();
三、表模型
mysql> desc person_nn_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_nn_sx;
+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| addressid | int(11) | NO | PRI | NULL | auto_increment |
| addressdetail | varchar(255) | YES | | NULL | |
+---------------+--------------+------+-----+---------+----------------+
mysql> desc join_nn_sx;
+-----------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------+------+-----+---------+-------+
| addressid | int(11) | NO | PRI | | |
| personid | int(11) | NO | PRI | | |
+-----------+---------+------+-----+---------+-------+
四、生成的SQL脚本
/* Formatted on 2007/08/22 17:59 (QP5 v5.50) */
CREATE TABLE `address_nn_sx` (
`addressid` int(11) NOT NULL auto_increment,
`addressdetail` varchar(255) default NULL,
PRIMARY KEY (`addressid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;
/* Formatted on 2007/08/22 17:59 (QP5 v5.50) */
CREATE TABLE `person_nn_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;
/* Formatted on 2007/08/22 17:59 (QP5 v5.50) */
CREATE TABLE `join_nn_sx` (
`addressid` int(11) NOT NULL,
`personid` int(11) NOT NULL,
PRIMARY KEY (`personid`,`addressid`),
KEY `FK6EBBC5EF6C600921` (`personid`),
KEY `FK6EBBC5EF2A92FF3D` (`addressid`),
CONSTRAINT `FK6EBBC5EF2A92FF3D` FOREIGN KEY (`addressid`) REFERENCES `address_nn_sx` (`addressid`),
CONSTRAINT `FK6EBBC5EF6C600921` FOREIGN KEY (`personid`) REFERENCES `person_nn_sx` (`personid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;
五、映射方法
<hibernate-mapping>
<class name="com.lavasoft.sx._n_n.Personnn_sx" table="PERSON_nn_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-->
<!--table="join_1ntab_sx"指定了连接表的名字-->
<set name="addresses"
table="join_nn_sx"
cascade="all">
<!--column="personid"指定连接表中关联当前实体类的列名-->
<key column="personid" not-null="true"/>
<!--column="addressid"是连接表中关联本实体的外键-->
<many-to-many column="addressid"
class="com.lavasoft.sx._n_n.Addressnn_sx"/>
</set>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="com.lavasoft.sx._n_n.Addressnn_sx"
table="ADDRESS_nn_sx">
<id name="addressid">
<generator class="identity"/>
</id>
<property name="addressdetail"/>
<!--table="join_nn_sx"是双向多对多的连接表-->
<set name="persons"
inverse="true"
table="join_nn_sx">
<!--column="addressid"是连接表中关联本实体的外键-->
<key column="addressid"/>
<many-to-many column="personid"
class="com.lavasoft.sx._n_n.Personnn_sx"/>
</set>
</class>
</hibernate-mapping>
六、测试方法
public class Test_nn_sx {
public static void main(String[] args){
Addressnn_sx add1=new Addressnn_sx();
Addressnn_sx add2=new Addressnn_sx();
Personnn_sx p1=new Personnn_sx();
Personnn_sx p2=new Personnn_sx();
add1.setAddressdetail("郑州市经三路");
add2.setAddressdetail("合肥市宿州路");
p1.setName("wang");
p1.setAge(30);
p2.setName("zhang");
p2.setAge(22);
p1.getAddresses().add(add1);
p1.getAddresses().add(add2);
p2.getAddresses().add(add2);
add1.getPersons().add(p1);
add2.getPersons().add(p1);
add2.getPersons().add(p2);
Session session= HibernateUtil.getCurrentSession();
Transaction tx=session.beginTransaction();
session.save(p1);
session.save(p2);
// session.saveOrUpdate(add1);
// session.saveOrUpdate(add2);
tx.commit();
HibernateUtil.closeSession();
}
}
七、测试结果
1) :正常保存.
session.save(p1);
session.save(p2);
// session.saveOrUpdate(add1);
// session.saveOrUpdate(add2);
Hibernate: insert into PERSON_nn_sx (name, age) values (?, ?)
Hibernate: insert into ADDRESS_nn_sx (addressdetail) values (?)
Hibernate: insert into ADDRESS_nn_sx (addressdetail) values (?)
Hibernate: insert into PERSON_nn_sx (name, age) values (?, ?)
Hibernate: insert into join_nn_sx (personid, addressid) values (?, ?)
Hibernate: insert into join_nn_sx (personid, addressid) values (?, ?)
Hibernate: insert into join_nn_sx (personid, addressid) values (?, ?)
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