Hibernate 一对一连接表双向关联

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 (?, ?)