Hibernate 一对多连接表双向关联
Hibernate 一对多连接表双向关联
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 Person1ntab_sx {
private int personid;
private String name;
private int age;
private Set addresses=new HashSet();
public class Address1ntab_sx {
private int addressid;
private String addressdetail;
private Person1ntab_sx person1ntab_sx;
三、表模型
mysql> desc person_1ntab_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_1ntab_sx;
+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| addressid | int(11) | NO | PRI | NULL | auto_increment |
| addressdetail | varchar(255) | YES | | NULL | |
+---------------+--------------+------+-----+---------+----------------+
mysql> desc join_1ntab_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 17:52 (QP5 v5.50) */
CREATE TABLE `address_1ntab_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 17:52 (QP5 v5.50) */
CREATE TABLE `person_1ntab_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 17:52 (QP5 v5.50) */
CREATE TABLE `join_1ntab_sx` (
`addressid` int(11) NOT NULL,
`personid` int(11) NOT NULL,
PRIMARY KEY (`personid`,`addressid`),
KEY `FK8F869F61F93DDD6` (`personid`),
KEY `FK8F869F61FC0F682A` (`addressid`),
CONSTRAINT `FK8F869F61FC0F682A` FOREIGN KEY (`addressid`) REFERENCES `address_1ntab_sx` (`addressid`),
CONSTRAINT `FK8F869F61F93DDD6` FOREIGN KEY (`personid`) REFERENCES `person_1ntab_sx` (`personid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;
五、映射方法
<hibernate-mapping>
<class name="com.lavasoft.sx._1_n_tab.Person1ntab_sx" table="PERSON_1ntab_sx">
<id name="personid">
<generator not-null="true"/>
<!--unique="true"表示当前实体类是"1",不是"n"-->
<many-to-many column="addressid"
unique="true"
class="com.lavasoft.sx._1_n_tab.Address1ntab_sx"/>
</set>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="com.lavasoft.sx._1_n_tab.Address1ntab_sx"
table="ADDRESS_1ntab_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-->
<join table="join_1ntab_sx"
inverse="true"
optional="true">
<key column="addressid"/>
<many-to-one name="person1ntab_sx"
column="personid"
cascade="all"
not-null="true"/>
</join>
</class>
</hibernate-mapping>
六、测试方法
public class Test_1ntab_sx {
public static void main(String[] args){
Address1ntab_sx add1=new Address1ntab_sx();
Address1ntab_sx add2=new Address1ntab_sx();
Person1ntab_sx p=new Person1ntab_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.setPerson1ntab_sx(p);
add2.setPerson1ntab_sx(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_1ntab_sx (name, age) values (?, ?)
Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)
Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)
Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)
Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)
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