Hibernate 一对多连接表双向关联

一、模型介绍

 

一个人（Person）对应多个地址（Address）。

 

二、实体（省略getter、setter方法）

 

public class Person1ntab_sx {

    private int personid;

    private String name;

    private int age;

    private Set addresses=new HashSet();

 

public class Address1ntab_sx {

    private int addressid;

    private String addressdetail;

    private Person1ntab_sx person1ntab_sx;

 

三、表模型

 

mysql> desc person_1ntab_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 address_1ntab_sx;

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

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

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

| addressid     | int(11)      | NO   | PRI | NULL    | auto_increment |

| addressdetail | varchar(255) | YES  |     | NULL    |                |

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

 

mysql> desc join_1ntab_sx;

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

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

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

| addressid | int(11) | NO   | PRI |         |       |

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

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

 

四、生成的SQL脚本

 

/* Formatted on 2007/08/22 17:52 (QP5 v5.50) */

CREATE TABLE `address_1ntab_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 17:52 (QP5 v5.50) */

CREATE TABLE `person_1ntab_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 17:52 (QP5 v5.50) */

CREATE TABLE `join_1ntab_sx` (

  `addressid` int(11) NOT NULL,

  `personid` int(11) NOT NULL,

  PRIMARY KEY  (`personid`,`addressid`),

  KEY `FK8F869F61F93DDD6` (`personid`),

  KEY `FK8F869F61FC0F682A` (`addressid`),

  CONSTRAINT `FK8F869F61FC0F682A` FOREIGN KEY (`addressid`) REFERENCES `address_1ntab_sx` (`addressid`),

  CONSTRAINT `FK8F869F61F93DDD6` FOREIGN KEY (`personid`) REFERENCES `person_1ntab_sx` (`personid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

 

五、映射方法

 

<hibernate-mapping>

    <class name="com.lavasoft.sx._1_n_tab.Person1ntab_sx" table="PERSON_1ntab_sx">

        <id name="personid">

            <generator class="identity"/>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--映射集合属性，关联到持久化类-->

        <!--table="join_1ntab_sx"指定了连接表的名字-->

        <set name="addresses"

             table="join_1ntab_sx"

             cascade="all">

            <!--column="personid"指定连接表中关联当前实体类的列名-->

            <key column="personid" not-null="true"/>

            <!--unique="true"表示当前实体类是"1",不是"n"-->

            <many-to-many column="addressid"

                          unique="true"

                          class="com.lavasoft.sx._1_n_tab.Address1ntab_sx"/>

        </set>

    </class>

</hibernate-mapping>

 

<hibernate-mapping>

    <class name="com.lavasoft.sx._1_n_tab.Address1ntab_sx"

           table="ADDRESS_1ntab_sx">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

        <!--映射关联属性，column属性指定外键列名-->

        <join   table="join_1ntab_sx"

                inverse="true"

              optional="true">

            <key column="addressid"/>

            <many-to-one name="person1ntab_sx"

                         column="personid"

                         cascade="all"

                         not-null="true"/>

        </join>

    </class>

</hibernate-mapping>

 

六、测试方法

 

public class Test_1ntab_sx {

    public static void main(String[] args){

        Address1ntab_sx add1=new Address1ntab_sx();

        Address1ntab_sx add2=new Address1ntab_sx();

        Person1ntab_sx p=new Person1ntab_sx();

 

        add1.setAddressdetail("郑州市经三路");

        add2.setAddressdetail("合肥市宿州路");

        p.setName("wang");

        p.setAge(30);

 

        p.getAddresses().add(add1);

        p.getAddresses().add(add2);

        add1.setPerson1ntab_sx(p);

        add2.setPerson1ntab_sx(p);

 

        Session session= HibernateUtil.getCurrentSession();

        Transaction tx=session.beginTransaction();

//        session.save(p);

        session.saveOrUpdate(add1);

        session.saveOrUpdate(add2);

        tx.commit();

        HibernateUtil.closeSession();

    }

}

 

七、测试结果

 

1) :正常保存.

//        session.save(p);

        session.saveOrUpdate(add1);

        session.saveOrUpdate(add2);

 

Hibernate: insert into PERSON_1ntab_sx (name, age) values (?, ?)

Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)

Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)

Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)

Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)