Hibernate 一对一连接表单向关联
2012-12-04 14:11
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| [align=left]这种情况很少见，但Hibernate同样允许采用连接表关联1-1.有连接表的1-1同样只需要将N-1的many-to-one元素增加unique="true"属性即可。[/align] |
| [align=left] [/align] |
| [align=left]一、模型介绍[/align] |
| [align=left] [/align] |
| [align=left]一个人（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 Person11tab {[/align] |
| [align=left] private int personid;[/align] |
| [align=left] private String name;[/align] |
| [align=left] private int age;[/align] |
| [align=left] private Address11tab address11tab;[/align] |
| [align=left] [/align] |
| [align=left]public class Address11tab {[/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_11tab;[/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 join_11tab;[/align] |
| [align=left]+--------------+---------+------+-----+---------+-------+[/align] |
| [align=left]| Field | Type | Null | Key | Default | Extra |[/align] |
| [align=left]+--------------+---------+------+-----+---------+-------+[/align] |
| [align=left]| personid | int(11) | NO | PRI | | |[/align] |
| [align=left]| address11tab | int(11) | YES | UNI | NULL | |[/align] |
| [align=left]+--------------+---------+------+-----+---------+-------+[/align] |
| [align=left] [/align] |
| [align=left]mysql> desc person_11tab;[/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]+----------+--------------+------+-----+---------+----------------+[/align] |
| [align=left] [/align] |
| [align=left]四、生成的SQL脚本[/align] |
| [align=left] [/align] |
| [align=left]/* Formatted on 2007/08/20 16:52 (QP5 v5.50) */[/align] |
| [align=left]CREATE TABLE `join_11tab` ([/align] |
| [align=left] `personid` int(11) NOT NULL,[/align] |
| [align=left] `address11tab` int(11) default NULL,[/align] |
| [align=left] PRIMARY KEY (`personid`),[/align] |
| [align=left] UNIQUE KEY `address11tab` (`address11tab`),[/align] |
| [align=left] KEY `FK6B44BE1F` (`personid`),[/align] |
| [align=left] CONSTRAINT `FK6B44BE209049BB20C4CC3D33` FOREIGN KEY (`address11tab`) REFERENCES `address_11tab` (`addressid`)[/align] |
| [align=left]) ENGINE=InnoDB DEFAULT CHARSET=gbk;[/align] |
| [align=left][/align] |
| [align=left]/* Formatted on 2007/08/20 16:53 (QP5 v5.50) */[/align] |
| [align=left]CREATE TABLE `address_11tab` ([/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 AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;[/align] |
| [align=left] [/align] |
| [align=left]/* Formatted on 2007/08/20 16:53 (QP5 v5.50) */[/align] |
| [align=left]CREATE TABLE `person_11tab` ([/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] PRIMARY KEY (`personid`)[/align] |
| [align=left]) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;[/align] |
| [align=left] [/align] |
| [align=left] [/align] |
| [align=left]五、映射方法：在Person中添加Address属性，映射配置为：[/align] |
| [align=left] <!--使用join元素显式确定链接表-->[/align] |
| [align=left] <join table="join_11tab">[/align] |
| [align=left] <key column="personid"/>[/align] |
| [align=left] <!--映射1-1关联属性，其中unique=“true”属性确定为“1-1”-->[/align] |
| [align=left] <many-to-one name="address11tab" unique="true"/>[/align] |
| [align=left] </join>[/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._1_1_tab.Address11tab" table="ADDRESS_11tab">[/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_11tab {[/align] |
| [align=left] public static void main(String[] args){[/align] |
| [align=left] Person11tab p1=new Person11tab();[/align] |
| [align=left] [/align] |
| [align=left] p1.setAge(21);[/align] |
| [align=left] p1.setName("p1");[/align] |
| [align=left] [/align] |
| [align=left] Address11tab add1=new Address11tab();[/align] |
| [align=left] add1.setAddressdetail("郑州市经三路");[/align] |
| [align=left] [/align] |
| [align=left] p1.setAddress11tab(add1);[/align] |
| [align=left] [/align] |
| [align=left] Session session= HibernateUtil.getCurrentSession();[/align] |
| [align=left] Transaction tx=session.beginTransaction();[/align] |
| [align=left] session.save(add1);[/align] |
| [align=left] session.save(p1);[/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] session.save(add1);[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into PERSON_11tab (name, age) values (?, ?)[/align] |
| [align=left]Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)[/align] |
| [align=left] [/align] |
| [align=left]2) :正常保存.[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left] session.save(add1);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into PERSON_11tab (name, age) values (?, ?)[/align] |
| [align=left]Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)[/align] |
| [align=left]Hibernate: update join_11tab set address11tab=? where personid=?[/align] |
| [align=left] [/align] |
| [align=left]3) :正常保存.[/align] |
| [align=left]// session.save(p1);[/align] |
| [align=left] session.save(add1);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)[/align] |
| [align=left] [/align] |
| [align=left]4) : 发生异常,不能保存.[/align] |
| [align=left] session.save(p1);[/align] |
| [align=left]// session.save(add1);[/align] |
| [align=left] [/align] |
| [align=left]Hibernate: insert into PERSON_11tab (name, age) values (?, ?)[/align] |
| [align=left]Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)[/align] |
| [align=left]Exception in thread "main" org.hibernate.TransientObjectException: com.lavasoft.dx._1_1_tab.Address11t[/align] |
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