Hibernate 一对一连接表双向关联

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原文地址：http://lavasoft.blog.51cto.com/62575/39335

Hibernate 一对一连接表双向关联

 

一、模型介绍

 

一个人（Person）对应一个地址（Address）。

 

二、实体（省略getter、setter方法）

 

public class Person11tab_sx { private int personid; private String name; private int age; private Address11tab_sx address11tab_sx; public class Address11tab_sx { private int addressid; private String addressdetail; private Person11tab_sx person11tab_sx;

 

三、表模型

 

mysql> desc person_11tab_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 join_11tab_sx;

+-----------+---------+------+-----+---------+-------+

| Field     | Type    | Null | Key | Default | Extra |

+-----------+---------+------+-----+---------+-------+

| addressid | int(11) | NO   | UNI |         |       |

| personid  | int(11) | NO   | PRI |         |       |

+-----------+---------+------+-----+---------+-------+

 

mysql> desc address_11tab_sx;

+---------------+--------------+------+-----+---------+----------------+

| 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 2007/08/22 17:35 (QP5 v5.50) */

CREATE TABLE `person_11tab_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 17:34 (QP5 v5.50) */

CREATE TABLE `address_11tab_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 18:35 (QP5 v5.50) */
CREATE TABLE `join_11tab_sx` (
  `addressid` int(11) NOT NULL,
  `personid` int(11) NOT NULL,
  PRIMARY KEY  (`personid`),
  UNIQUE KEY `addressid` (`addressid`),
  UNIQUE KEY `personid` (`personid`),
  KEY `FKF4AA80E44327AAB6` (`personid`),
  KEY `FKF4AA80E460C0C9F0` (`addressid`),
  CONSTRAINT `FKF4AA80E460C0C9F0` FOREIGN KEY (`addressid`) REFERENCES `address_11tab_sx` (`addressid`),
  CONSTRAINT `FKF4AA80E44327AAB6` FOREIGN KEY (`personid`) REFERENCES `person_11tab_sx` (`personid`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

五、映射方法

<hibernate-mapping> <class name="com.lavasoft.sx._1_1_tab.Person11tab_sx" table="PERSON_11tab_sx"> <id name="personid"> <generator class="identity"/> </id> <property name="name"/> <property name="age"/> <join table="join_11tab_sx" optional="true"> <key column="personid" unique="true"/> <many-to-one name="address11tab_sx" column="addressid" not-null="true" unique="true"/> </join> </class> </hibernate-mapping> <hibernate-mapping> <class name="com.lavasoft.sx._1_1_tab.Address11tab_sx" table="ADDRESS_11tab_sx"> <id name="addressid"> <generator class="identity"/> </id> <property name="addressdetail"/> <join table="join_11tab_sx" optional="true" inverse="true"> <key column="addressid" unique="true"/> <many-to-one name="person11tab_sx" column="personid" not-null="true" unique="true"/> </join> </class> </hibernate-mapping>

六、测试方法

public class Test_11tab_sx { public static void main(String[] args){ Address11tab_sx add = new Address11tab_sx(); Person11tab_sx p = new Person11tab_sx(); add.setAddressdetail("郑州市经三路"); p.setAge(12); p.setName("wudalang"); add.setPerson11tab_sx(p); p.setAddress11tab_sx(add); Session session = HibernateUtil.getCurrentSession(); Transaction tx = session.beginTransaction(); session.saveOrUpdate(p); session.saveOrUpdate(add); tx.commit(); HibernateUtil.closeSession(); } }

七、测试结果

1) :正常保存. session.saveOrUpdate(p); session.saveOrUpdate(add); Hibernate: insert into PERSON_11tab_sx (name, age) values (?, ?) Hibernate: insert into ADDRESS_11tab_sx (addressdetail) values (?) Hibernate: insert into join_11tab_sx (addressid, personid) values (?, ?)

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