Hibernate 多对一连接表单向关联

2019-11-10 18:13:46

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Hibernate 多对一连接表单向关联

一、模型介绍

多个人（Person）对应一个地址（Address）。

二、实体（省略getter、setter方法）

public class Personn1tab {

PRivate int personid;

private String name;

private int age;

private Addressn1tab addressn1tab;

public class Addressn1tab {

private int addressid;

private String addressdetail;

三、表模型

MySQL> desc address_n1tab;

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

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

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

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

mysql> desc join_n1tab;

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

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

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

| addressn1tab | int(11) | YES | MUL | NULL | |

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

mysql> desc person_n1tab;

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

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

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

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

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

四、生成的SQL脚本

CREATE TABLE `address_n1tab` (

`addressid` int(11) NOT NULL auto_increment,

`addressdetail` varchar(255) default NULL,

PRIMARY KEY (`addressid`)

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

CREATE TABLE `join_n1tab` (

`personid` int(11) NOT NULL,

`address11fk` int(11) default NULL,

PRIMARY KEY (`personid`),

KEY `FKAC780AAADAE3A82C` (`personid`),

KEY `FKAC780AAAC6242A64` (`address11fk`),

CONSTRAINT `FKAC780AAAC6242A64` FOREIGN KEY (`address11fk`) REFERENCES `address_n1tab` (`addressid`),

CONSTRAINT `FKAC780AAADAE3A82C` FOREIGN KEY (`personid`) REFERENCES `person_n1tab` (`personid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

CREATE TABLE `person_n1tab` (

`personid` int(11) NOT NULL auto_increment,

`name` varchar(255) default NULL,

`age` int(11) default NULL,

PRIMARY KEY (`personid`)

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

五、映射方法

<hibernate-mapping>

</id>

<many-to-one name="addressn1tab"/>

</join>

</class>

</hibernate-mapping>

<hibernate-mapping>

</id>

</class>

</hibernate-mapping>

六、测试方法

public class Test_n1tab {

public static void main(String[] args){

Personn1tab p1=new Personn1tab();

Personn1tab p2=new Personn1tab();

p1.setAge(21);

p1.setName("p1");

p2.setAge(23);

p2.setName("p2");

Addressn1tab add=new Addressn1tab();

add.setAddressdetail("郑州市经三路");

p1.setAddressn1tab(add);

p2.setAddressn1tab(add);

session session=HibernateUtil.getCurrentSession();

Transaction tx=session.beginTransaction();

session.save(add);

session.save(p1);

session.save(p2);

tx.commit();

HibernateUtil.closeSession();

}

七、测试结果

1) :正常保存. 推荐这么干!

session.save(p1);

session.save(p2);

Hibernate: insert into ADDRESS_n1tab (addressdetail) values (?)

Hibernate: insert into PERSON_n1tab (name, age) values (?, ?)

Hibernate: insert into join_n1tab (address11fk, personid) values (?, ?)

Hibernate: insert into PERSON_n1tab (name, age) values (?, ?)

Hibernate: insert into join_n1tab (address11fk, personid) values (?, ?)

2) :正常保存.

session.save(p1);

session.save(p2);

session.save(add);

Hibernate: insert into PERSON_n1tab (name, age) values (?, ?)

Hibernate: insert into join_n1tab (address11fk, personid) values (?, ?)

Hibernate: insert into PERSON_n1tab (name, age) values (?, ?)

Hibernate: insert into join_n1tab (address11fk, personid) values (?, ?)

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