Hibernate 一对多外键单向关联
2017-02-08 17:43
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[align=left]Hibernate 一对多外键单向关联[/align]
| [align=left] [/align] |
| [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）对应多个地址（Address），比如家庭地址、公司地址。[/align] |
| [align=left] [/align] |
| [align=left]二、实体（省略getter、setter方法）[/align] |
| [align=left] [/align] |
| [align=left]public class Person1nfk implements Serializable {[/align] |
| [align=left] private int personid;[/align] |
| [align=left] private String name;[/align] |
| [align=left] private int age;[/align] |
| [align=left] private Set addresses=new HashSet();[/align] |
| [align=left] [/align] |
| [align=left]public class Address1nfk implements Serializable {[/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_1nfk;[/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]| personid | int(11) | YES | MUL | NULL | |[/align] |
| [align=left]+---------------+--------------+------+-----+---------+----------------+[/align] |
| [align=left] [/align] |
| [align=left]mysql> desc person_1nfk;[/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 2007/08/21 10:06 (QP5 v5.50) */[/align] |
| [align=left] CREATE TABLE `address_1nfk` ([/align] |
| [align=left] `addressid` int(11) NOT NULL auto_increment,[/align] |
| [align=left] `addressdetail` varchar(255) default NULL,[/align] |
| [align=left] `addresses` int(11) default NULL,[/align] |
| [align=left] PRIMARY KEY (`addressid`),[/align] |
| [align=left] KEY `FK9B93456DC08D1667` (`addresses`),[/align] |
| [align=left] CONSTRAINT `FK9B93456DC08D1667` FOREIGN KEY (`addresses`) REFERENCES `person_1nfk` (`personid`)[/align] |
| [align=left] ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=gbk;[/align] |
| [align=left] [/align] |
| [align=left] /* Formatted on 2007/08/21 10:07 (QP5 v5.50) */[/align] |
| [align=left] CREATE TABLE `person_1nfk` ([/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：在实体类Person里面添加Address的集合，即可形成一对多关系。[/align] |
| [align=left] <!--映射集合属性，关联到持久化类,inverse="false"表示主控端在Person1nfk端，lazy="false"表示不采用延迟加载-->[/align] |
| [align=left] <set name="addresses"[/align] |
| [align=left] table="ADDRESS_1nfk"[/align] |
| [align=left] cascade="all"[/align] |
| [align=left] >[/align] |
| [align=left] <!--确定关联的外键列-->[/align] |
| [align=left] <key column="personid"/>[/align] |
| [align=left] <!--用以映射到关联类属性-->[/align] |
| [align=left] <one-to-many class="com.lavasoft.dx._1_n_fk.Address1nfk"/>[/align] |
| [align=left] </set>[/align] |
| [align=left] [/align] |
| [align=left]<hibernate-mapping>[/align] |
| [align=left] <class name="com.lavasoft.dx._1_n_fk.Person1nfk" table="PERSON_1nfk">[/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] <!--映射集合属性，关联到持久化类,inverse="false"表示主控端在Person1nfk端，lazy="false"表示不采用延迟加载-->[/align] |
| [align=left] <set name="addresses"[/align] |
| [align=left] table="ADDRESS_1nfk"[/align] |
| [align=left] cascade="all"[/align] |
| [align=left] >[/align] |
| [align=left] <!--确定关联的外键列-->[/align] |
| [align=left] <key column="personid"/>[/align] |
| [align=left] <!--用以映射到关联类属性-->[/align] |
| [align=left] <one-to-many class="com.lavasoft.dx._1_n_fk.Address1nfk"/>[/align] |
| [align=left] </set>[/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_n_fk.Address1nfk" table="ADDRESS_1nfk">[/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_1nfk {[/align] |
| [align=left] public static void main(String[] args){[/align] |
| [align=left] Address1nfk add1=new Address1nfk();[/align] |
| [align=left] Address1nfk add2=new Address1nfk();[/align] |
| [align=left] Person1nfk p=new Person1nfk();[/align] |
| [align=left] [/align] |
| [align=left] add1.setAddressdetail("郑州市经三路");[/align] |
| [align=left] add2.setAddressdetail("合肥市宿州路");[/align] |
| [align=left] p.setName("wang");[/align] |
| [align=left] p.setAge(30);[/align] |
| [align=left] p.getAddresses().add(add1);[/align] |
| [align=left] p.getAddresses().add(add2);[/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(add2);[/align] |
| [align=left] session.save(p);[/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.[/align] |
| [align=left]// session.save(add1);[/align] |
| [align=left]// session.save(add2);[/align] |
| [align=left] session.save(p);[/align] |
| [align=left]Hibernate: insert into PERSON_1nfk (name, age) values (?, ?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
| [align=left]Hibernate: update ADDRESS_1nfk set personid=? where addressid=?[/align] |
| [align=left]Hibernate: update ADDRESS_1nfk set personid=? where addressid=?[/align] |
| [align=left] [/align] |
| [align=left]2) :正常保存.[/align] |
| [align=left] session.save(add1);[/align] |
| [align=left] session.save(add2);[/align] |
| [align=left] session.save(p);[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into PERSON_1nfk (name, age) values (?, ?)[/align] |
| [align=left]Hibernate: update ADDRESS_1nfk set personid=? where addressid=?[/align] |
| [align=left]Hibernate: update ADDRESS_1nfk set personid=? where addressid=?[/align] |
| [align=left] [/align] |
| [align=left]3) :正常保存.[/align] |
| [align=left] session.save(add1);[/align] |
| [align=left] session.save(add2);[/align] |
| [align=left]// session.save(p);[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
| [align=left]Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)[/align] |
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