Hibernate 一对多连接表双向关联

2019-11-10 20:21:02

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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;

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

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

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

| age | int(11) | YES | | NULL | |

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

mysql> desc address_1ntab_sx;

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

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

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

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

mysql> desc join_1ntab_sx;

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

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

| 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>

</id>

<set name="addresses"

table="join_1ntab_sx"

cascade="all">

<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>

<join table="join_1ntab_sx"

inverse="true"

optional="true">

<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 join_1ntab_sx (personid, addressid) values (?, ?)

上一篇：HashMap原理详讲

下一篇：设计模式——设计原则

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