Hibernate 一对多连接表单向关联
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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=?
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