Hibernate 多对一外键单向关联
2016-04-07 14:32
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http://lavasoft.blog.51cto.com/62575/39321
| [align=left]Hibernate 多对一外键单向关联[/align] |
| [align=left] [/align] |
| [align=left]一、模型介绍[/align] |
| [align=left] [/align] |
| [align=left]多个人（Person）对应一个地址（Address）。[/align] |
| [align=left] [/align] |
| [align=left]二、实体（省略getter、setter方法）[/align] |
| [align=left][/align] |
| [align=left]public class Personn1fk {[/align] |
| [align=left] private int personid;[/align] |
| [align=left] private String name;[/align] |
| [align=left] private int age;[/align] |
| [align=left] private Addressn1fk addressn1fk;[/align] |
| [align=left] [/align] |
| [align=left]public class Addressn1fk {[/align] |
| [align=left] private int addressid;[/align] |
| [align=left] private String addressdetail;[/align] |
| [align=left] [/align] |
| [align=left]三、表模型[/align] |
| [align=left][/align] |
| [align=left]mysql> desc address_n1kf;[/align] |
| [align=left]+---------------+--------------+------+-----+---------+----------------+[/align] |
| [align=left]| Field | Type | Null | Key | Default | Extra |[/align] |
| [align=left]+---------------+--------------+------+-----+---------+----------------+[/align] |
| [align=left]| addressid | int(11) | NO | PRI | NULL | auto_increment |[/align] |
| [align=left]| addressdetail | varchar(255) | YES | | NULL | |[/align] |
| [align=left]+---------------+--------------+------+-----+---------+----------------+[/align] |
| [align=left] [/align] |
| [align=left]mysql> desc person_n1kf;[/align] |
| [align=left]+-----------+--------------+------+-----+---------+----------------+[/align] |
| [align=left]| Field | Type | Null | Key | Default | Extra |[/align] |
| [align=left]+-----------+--------------+------+-----+---------+----------------+[/align] |
| [align=left]| personid | int(11) | NO | PRI | NULL | auto_increment |[/align] |
| [align=left]| name | varchar(255) | YES | | NULL | |[/align] |
| [align=left]| age | int(11) | YES | | NULL | |[/align] |
| [align=left]| addressId | int(11) | YES | MUL | NULL | |[/align] |
| [align=left]+-----------+--------------+------+-----+---------+----------------+[/align] |
| [align=left] [/align] |
| [align=left]四、生成的SQL脚本[/align] |
| [align=left] [/align] |
| [align=left]CREATE TABLE `address_n1kf` ([/align] |
| [align=left] `addressid` int(11) NOT NULL auto_increment,[/align] |
| [align=left] `addressdetail` varchar(255) default NULL,[/align] |
| [align=left] PRIMARY KEY (`addressid`)[/align] |
| [align=left]) ENGINE=InnoDB DEFAULT CHARSET=gbk;[/align] |
| [align=left] [/align] |
| [align=left]DROP TABLE IF EXISTS `person_n1kf`;[/align] |
| [align=left] [/align] |
| [align=left]CREATE TABLE `person_n1kf` ([/align] |
| [align=left] `personid` int(11) NOT NULL auto_increment,[/align] |
| [align=left] `name` varchar(255) default NULL,[/align] |
| [align=left] `age` int(11) default NULL,[/align] |
| [align=left] `addressId` int(11) default NULL,[/align] |
| [align=left] PRIMARY KEY (`personid`),[/align] |
| [align=left] KEY `FK4571AF54A2A3EE48` (`addressId`),[/align] |
| [align=left] CONSTRAINT `FK4571AF54A2A3EE48` FOREIGN KEY (`addressId`) REFERENCES `address_n1kf` (`addressid`)[/align] |
| [align=left]) ENGINE=InnoDB DEFAULT CHARSET=gbk;[/align] |
| [align=left] [/align] |
| [align=left] [/align] |
| [align=left]五、映射方法[/align] |
| [align=left] [/align] |
| [align=left]<hibernate-mapping>[/align] |
| [align=left] <class name="com.lavasoft.dx._n_1_fk.Personn1fk" table="PERSON_n1fk">[/align] |
| [align=left] <id name="personid">[/align] |
| [align=left] <generator class="identity"/>[/align] |
| [align=left] </id>[/align] |
| [align=left] <property name="name"/>[/align] |
| [align=left] <property name="age"/>[/align] |
| [align=left] <!--用来映射关联PO column是Address在该表中的外键列名-->[/align] |
| [align=left] <many-to-one name="addressn1fk" column="addressId"/>[/align] |
| [align=left] </class>[/align] |
| [align=left]</hibernate-mapping>[/align] |
| [align=left] [/align] |
| [align=left]<hibernate-mapping>[/align] |
| [align=left] <class name="com.lavasoft.dx._n_1_fk.Addressn1fk" table="ADDRESS_n1fk">[/align] |
| [align=left] <id name="addressid">[/align] |
| [align=left] <generator class="identity"/>[/align] |
| [align=left] </id>[/align] |
| [align=left] <property name="addressdetail"/>[/align] |
| [align=left] </class>[/align] |
| [align=left]</hibernate-mapping>[/align] |
| [align=left] [/align] |
| [align=left] [/align] |
| [align=left]六、测试方法[/align] |
| [align=left] [/align] |
| [align=left]public class Test_n1fk {[/align] |
| [align=left] public static void main(String[] args){[/align] |
| [align=left] Personn1fk p1=new Personn1fk();[/align] |
| [align=left] Personn1fk p2=new Personn1fk();[/align] |
| [align=left] [/align] |
| [align=left] p1.setAge(21);[/align] |
| [align=left] p1.setName("p1");[/align] |
| [align=left] [/align] |
| [align=left] p2.setAge(23);[/align] |
| [align=left] p2.setName("p2");[/align] |
| [align=left] [/align] |
| [align=left] Addressn1fk add=new Addressn1fk();[/align] |
| [align=left] add.setAddressdetail("郑州市经三路");[/align] |
| [align=left] [/align] |
| [align=left] p1.setAddressn1fk(add);[/align] |
| [align=left] p2.setAddressn1fk(add);[/align] |
| [align=left] [/align] |
| [align=left] Session session=HibernateUtil.getCurrentSession();[/align] |
| [align=left] Transaction tx=session.beginTransaction();[/align] |
| [align=left] session.save(add);[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] session.save(p2);[/align] |
| [align=left] tx.commit();[/align] |
| [align=left] HibernateUtil.closeSession();[/align] |
| [align=left] }[/align] |
| [align=left]}[/align] |
| [align=left][/align] |
| [align=left]七、测试结果[/align] |
| [align=left] [/align] |
| [align=left]1) :正常保存. 推荐这么干![/align] |
| [align=left] [/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] session.save(p2);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into ADDRESS_n1kf (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left] [/align] |
| [align=left]2) :正常保存.[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] session.save(p2);[/align] |
| [align=left] session.save(add);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_n1kf (addressdetail) values (?)[/align] |
| [align=left]Hibernate: update PERSON_n1kf set name=?, age=?, addressId=? where personid=?[/align] |
| [align=left]Hibernate: update PERSON_n1kf set name=?, age=?, addressId=? where personid=?[/align] |
| [align=left] [/align] |
| [align=left]3) :正常保存.[/align] |
| [align=left] session.save(add);[/align] |
| [align=left]// session.save(p1);[/align] |
| [align=left]// session.save(p2);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into ADDRESS_n1kf (addressdetail) values (?)[/align] |
| [align=left] [/align] |
| [align=left]4) : 发生异常,不能保存.[/align] |
| [align=left]// session.save(add);[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] session.save(p2);[/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left]Hibernate: insert into PERSON_n1kf (name, age, addressId) values (?, ?, ?)[/align] |
| [align=left]Exception in thread "main" org.hibernate.TransientObjectException: com.lavasoft.dx._n_1_fk.Addressn1kf[/align] |
| [align=left] [/align] |
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