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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