Hibernate 一对多连接表单向关联

2019-11-10 18:14:16

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Hibernate 一对多连接表单向关联

一、模型介绍

一个人（Person）对应多个地址（Address），比如家庭地址、公司地址。

二、实体（省略getter、setter方法）

public class Person1ntab {

PRivate int personid;

private String name;

private int age;

private Set addresses=new HashSet();

public class Address1nfk implements Serializable {

private int addressid;

private String addressdetail;

三、表模型

MySQL> desc join_1ntab;

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

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

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

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

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

mysql> desc person_1ntab;

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

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

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

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

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

mysql> desc address_1ntab;

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

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

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

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

四、生成的SQL脚本

/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */

CREATE TABLE `address_1ntab` (

`addressid` int(11) NOT NULL auto_increment,

`addressdetail` varchar(255) default NULL,

PRIMARY KEY (`addressid`)

) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */

CREATE TABLE `join_1ntab` (

`personid` int(11) NOT NULL,

`addressid` int(11) NOT NULL,

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

UNIQUE KEY `addressid` (`addressid`),

KEY `FK6B6078C3C8DF5BFF` (`personid`),

KEY `FK6B6078C3C2B11347` (`addressid`),

CONSTRAINT `FK6B6078C3C2B11347` FOREIGN KEY (`addressid`) REFERENCES `address_1ntab` (`addressid`),

CONSTRAINT `FK6B6078C3C8DF5BFF` FOREIGN KEY (`personid`) REFERENCES `person_1ntab` (`personid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/21 10:58 (QP5 v5.50) */

CREATE TABLE `person_1ntab` (

`personid` int(11) NOT NULL auto_increment,

`name` varchar(255) default NULL,

`age` int(11) default NULL,

PRIMARY KEY (`personid`)

) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;

五、映射方法

<hibernate-mapping>

</id>

<set name="addresses"

table="join_1ntab"

<many-to-many

column="addressid"

unique="true"

class="com.lavasoft.dx._1_n_tab.Address1ntab"/>

</set>

</class>

</hibernate-mapping>

<hibernate-mapping>

</id>

</class>

</hibernate-mapping>

六、测试方法

public class Test_1ntab {

public static void main(String[] args){

Address1ntab add1=new Address1ntab();

Address1ntab add2=new Address1ntab();

Address1ntab add3=new Address1ntab();

Person1ntab p1=new Person1ntab();

Person1ntab p2=new Person1ntab();

add1.setAddressdetail("郑州市经三路");

add2.setAddressdetail("合肥市宿州路");

add3.setAddressdetail("北京市长安路");

p1.setName("wang");

p1.setAge(30);

p2.setName("lee");

p2.setAge(50);

p1.getAddresses().add(add1);

p1.getAddresses().add(add2);

//p2.getAddresses().add(add2);

p2.getAddresses().add(add3);

session session= HibernateUtil.getCurrentSession();

Transaction tx=session.beginTransaction();

session.save(add1);

session.save(add2);

session.save(add3);

session.save(p1);

session.save(p2);

tx.commit();

HibernateUtil.closeSession();

}

七、测试结果

1) :正常保存.

session.save(add1);

session.save(add2);

session.save(add3);

session.save(p1);

session.save(p2);

Hibernate: insert into PERSON_1nfk (name, age) values (?, ?)

Hibernate: insert into ADDRESS_1nfk (addressdetail) values (?)

Hibernate: update ADDRESS_1nfk set personid=? where addressid=?

上一篇：register关键字

下一篇：高数Umaru系列（9）——哈士奇

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