Hibernate 实体关联关系映射----总结

Hibernate 一对一主键单向关联

1-1的关联可以基于主键关联，但基于主键关联的持久化类不能拥有自己的主键生成策略，它的主键由关联类负责生成。另外，另外，增加one-to-one元素来关联属性，必须为one-to-one元素增加constrained="true"属性，表明该类主键由关联类生成。

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）

三、表模型

mysql> desc address_11pk;

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

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

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

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

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

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

mysql> desc person_11pk;

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

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

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

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

| name     | varchar(255) | YES  |     | NULL    |       |

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

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

四、生成的SQL脚本

/* Formatted on 2007/08/22 14:40 (QP5 v5.50) */

CREATE TABLE `address_11pk` (

  `addressid` int(11) NOT NULL auto_increment,

  `addressdetail` varchar(255) default NULL,

  PRIMARY KEY  (`addressid`)

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

/* Formatted on 2007/08/22 14:41 (QP5 v5.50) */

CREATE TABLE `person_11pk` (

  `presonid` int(11) NOT NULL,

  `name` varchar(255) default NULL,

  `age` int(11) default NULL,

  PRIMARY KEY  (`presonid`),

  KEY `FK68A882C591BB393E` (`presonid`),

  CONSTRAINT `FK68A882C591BB393E` FOREIGN KEY (`presonid`) REFERENCES `address_11pk` (`addressid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

五、映射方法：在Person中配置id生成策略为：

        <id name="personid">

            <!--基于主键关联时，主键生成策略是foreign，表明根据关联类生成主键-->

            <generator class="foreign">

                <!--关联持久化类的属性名-->

                <param name="property">address11pk</param>

            </generator>

        </id>

        ......

        <!--用于映射1-1关联-->

        <one-to-one name="address11pk" constrained="true"/>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_1_pk.Person11pk" table="PERSON_11pk">

        <id name="personid" column="presonid">

            <!--基于主键关联时，主键生成策略是foreign，表明根据关联类生成主键-->

            <generator class="foreign">

                <!--关联持久化类的属性名-->

                <param name="property">address11pk</param>

            </generator>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--用于映射1-1关联-->

        <one-to-one name="address11pk" constrained="true"/>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_1_pk.Address11pk" table="ADDRESS_11pk">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </class>

</hibernate-mapping>

六、测试方法

public class Test_11pk {

    public static void main(String[] args){

        Person11pk p1=new Person11pk();

        p1.setAge(21);

        p1.setName("p1");

        Address11pk add1=new Address11pk();

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

        p1.setAddress11pk(add1);

        Session session= HibernateUtil.getCurrentSession();

        Transaction tx=session.beginTransaction();

        session.save(add1);

        session.save(p1);

        tx.commit();

        HibernateUtil.closeSession();

    }

}

七、测试结果

1) :正常保存. 推荐这么干!

        session.save(add1);

        session.save(p1);

Hibernate: insert into ADDRESS_11fk (addressdetail) values (?)

Hibernate: insert into PERSON_11fk (name, age, addressId) values (?, ?, ?)

2) :正常保存.

        session.save(p1);

        session.save(add1);

Hibernate: insert into PERSON_11fk (name, age, addressId) values (?, ?, ?)

Hibernate: insert into ADDRESS_11fk (addressdetail) values (?)

Hibernate: update PERSON_11fk set name=?, age=?, addressId=? where personid=?

3) :正常保存.

//        session.save(p1);

        session.save(add1);

Hibernate: insert into ADDRESS_11fk (addressdetail) values (?)

4) : 发生异常,不能保存.

        session.save(p1);

//        session.save(add1);

Hibernate: insert into PERSON_11fk (name, age, addressId) values (?, ?, ?)

Hibernate 一对一连接表单向关联

    这种情况很少见，但Hibernate同样允许采用连接表关联1-1.有连接表的1-1同样只需要将N-1的many-to-one元素增加unique="true"属性即可。

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 {

    private int personid;

    private String name;

    private int age;

    private Address11tab address11tab;

public class Address11tab {

    private int addressid;

    private String addressdetail;

三、表模型

mysql> desc address_11tab;

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

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

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

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

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

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

mysql> desc join_11tab;

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

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

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

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

| address11tab | int(11) | YES  | UNI | NULL    |       |

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

mysql> desc person_11tab;

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

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

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

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

| name     | varchar(255) | YES  |     | NULL    |                |

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

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

四、生成的SQL脚本

/* Formatted on 2007/08/20 16:52 (QP5 v5.50) */

CREATE TABLE `join_11tab` (

  `personid` int(11) NOT NULL,

  `address11tab` int(11) default NULL,

  PRIMARY KEY  (`personid`),

  UNIQUE KEY `address11tab` (`address11tab`),

  KEY `FK6B44BE20C4CC3D33` (`address11tab`),

  KEY `FK6B44BE209049BB1F` (`personid`),

  CONSTRAINT `FK6B44BE209049BB1F` FOREIGN KEY (`personid`) REFERENCES `person_11tab` (`personid`),

  CONSTRAINT `FK6B44BE20C4CC3D33` FOREIGN KEY (`address11tab`) REFERENCES `address_11tab` (`addressid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/20 16:53 (QP5 v5.50) */

CREATE TABLE `address_11tab` (

  `addressid` int(11) NOT NULL auto_increment,

  `addressdetail` varchar(255) default NULL,

  PRIMARY KEY  (`addressid`)

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

/* Formatted on 2007/08/20 16:53 (QP5 v5.50) */

CREATE TABLE `person_11tab` (

  `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：在Person中添加Address属性，映射配置为：

        <!--使用join元素显式确定链接表-->

        <join table="join_11tab">

            <key column="personid"/>

            <!--映射1-1关联属性，其中unique=“true”属性确定为“1-1”-->

            <many-to-one name="address11tab" unique="true"/>

        </join>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_1_tab.Person11tab" table="PERSON_11tab">

        <id name="personid">

            <generator class="identity"/>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--使用join元素显式确定链接表-->

        <join table="join_11tab">

            <key column="personid"/>

            <!--映射1-1关联属性，其中unique=“true”属性确定为“1-1”-->

            <many-to-one name="address11tab" unique="true"/>

        </join>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_1_tab.Address11tab" table="ADDRESS_11tab">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </class>

</hibernate-mapping>

六、测试方法

public class Test_11tab {

    public static void main(String[] args){

        Person11tab p1=new Person11tab();

        p1.setAge(21);

        p1.setName("p1");

        Address11tab add1=new Address11tab();

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

        p1.setAddress11tab(add1);

        Session session= HibernateUtil.getCurrentSession();

        Transaction tx=session.beginTransaction();

        session.save(add1);

        session.save(p1);

        tx.commit();

        HibernateUtil.closeSession();

    }

}

七、测试结果

1) :正常保存. 推荐这么干!

        session.save(add1);

        session.save(p1);

Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)

Hibernate: insert into PERSON_11tab (name, age) values (?, ?)

Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)

2) :正常保存.

        session.save(p1);

        session.save(add1);

Hibernate: insert into PERSON_11tab (name, age) values (?, ?)

Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)

Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)

Hibernate: update join_11tab set address11tab=? where personid=?

3) :正常保存.

//        session.save(p1);

        session.save(add1);

Hibernate: insert into ADDRESS_11tab (addressdetail) values (?)

4) : 发生异常,不能保存.

        session.save(p1);

//        session.save(add1);

Hibernate: insert into PERSON_11tab (name, age) values (?, ?)

Hibernate: insert into join_11tab (address11tab, personid) values (?, ?)

Exception in thread "main" org.hibernate.TransientObjectException: com.lavasoft.dx._1_1_tab.Address11tab

Hibernate 一对多外键单向关联

    这种情况很少见，但Hibernate同样允许采用连接表关联1-1.有连接表的1-1同样只需要将N-1的many-to-one元素增加unique="true"属性即可。

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 Person1nfk implements Serializable {

    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 address_1nfk;

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

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

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

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

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

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

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

mysql> desc person_1nfk;

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

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

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

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

| name     | varchar(255) | YES  |     | NULL    |                |

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

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

四、生成的SQL脚本

  /* Formatted on 2007/08/21 10:06 (QP5 v5.50) */

  CREATE TABLE `address_1nfk` (

    `addressid` int(11) NOT NULL auto_increment,

    `addressdetail` varchar(255) default NULL,

    `addresses` int(11) default NULL,

    PRIMARY KEY  (`addressid`),

    KEY `FK9B93456DC08D1667` (`addresses`),

    CONSTRAINT `FK9B93456DC08D1667` FOREIGN KEY (`addresses`) REFERENCES `person_1nfk` (`personid`)

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

  /* Formatted on 2007/08/21 10:07 (QP5 v5.50) */

  CREATE TABLE `person_1nfk` (

    `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：在实体类Person里面添加Address的集合，即可形成一对多关系。

        <!--映射集合属性，关联到持久化类,inverse="false"表示主控端在Person1nfk端，lazy="false"表示不采用延迟加载-->

        <set name="addresses"

             table="ADDRESS_1nfk"

             cascade="all"

        >

            <!--确定关联的外键列-->

            <key column="personid"/>

            <!--用以映射到关联类属性-->

            <one-to-many class="com.lavasoft.dx._1_n_fk.Address1nfk"/>

        </set>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_n_fk.Person1nfk" table="PERSON_1nfk">

        <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,inverse="false"表示主控端在Person1nfk端，lazy="false"表示不采用延迟加载-->

        <set name="addresses"

             table="ADDRESS_1nfk"

             cascade="all"

        >

            <!--确定关联的外键列-->

            <key column="personid"/>

            <!--用以映射到关联类属性-->

            <one-to-many class="com.lavasoft.dx._1_n_fk.Address1nfk"/>

        </set>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_n_fk.Address1nfk" table="ADDRESS_1nfk">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </class>

</hibernate-mapping>

六、测试方法

public class Test_1nfk {

    public static void main(String[] args){

        Address1nfk add1=new Address1nfk();

        Address1nfk add2=new Address1nfk();

        Person1nfk p=new Person1nfk();

        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);

        Session session= HibernateUtil.getCurrentSession();

        Transaction tx=session.beginTransaction();

        session.save(add1);

        session.save(add2);

        session.save(p);

        tx.commit();

        HibernateUtil.closeSession();

    }

}

七、测试结果

1) :正常保存.

//        session.save(add1);

//        session.save(add2);

        session.save(p);

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

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

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

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

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

2) :正常保存.

        session.save(add1);

        session.save(add2);

        session.save(p);

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

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

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

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

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

3) :正常保存.

        session.save(add1);

        session.save(add2);

//        session.save(p);

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

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;

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

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

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

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

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

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

mysql> desc person_1ntab;

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

| 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;

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

| 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 2007/08/21 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>

    <class name="com.lavasoft.dx._1_n_tab.Person1ntab" table="PERSON_1ntab">

        <id name="personid">

            <generator class="identity"/>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--映射集合属性，join_1ntab是连接表表名-->

        <set name="addresses"

             table="join_1ntab"

                >

            <!--“column="personid"”确定PERSON_1ntab表关联到连接表的外键列名-->

            <key column="personid"/>

            <!--“column="addressid"”关联PERSON_1ntab表的Address1ntab对象的id在连接表中的列名-->

            <!--“unique="true"表示1-N，Person1ntab是1，Address1ntab是多”-->

            <many-to-many

                    column="addressid"

                    unique="true"

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

        </set>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._1_n_tab.Address1ntab" table="ADDRESS_1ntab">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </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: insert into ADDRESS_1nfk (addressdetail) values (?)

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

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;

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

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

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

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

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

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

mysql> desc join_n1tab;

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

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

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

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

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

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

mysql> desc person_n1tab;

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

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

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

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

| name     | varchar(255) | YES  |     | NULL    |                |

| 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>

    <class name="com.lavasoft.dx._n_1_tab.Personn1tab" table="PERSON_n1tab">

        <id name="personid">

            <generator class="identity"/>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--使用join元素显式确定链接表-->

        <join table="join_n1tab">

            <!--映射关联所用的外键-->

            <key column="personid"/>

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

        </join>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._n_1_tab.Addressn1tab" table="ADDRESS_n1tab">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </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 (?, ?)

Hibernate 多对多单向关联

一、模型介绍

多个人（Person）对应多个地址（Address）。

一个人可对应多个地址，一个地址也可以对应多个人。 

二、实体（省略getter、setter方法）

public class Personnn {

    private int personid;

    private String name;

    private int age;

    private Set addresses=new HashSet();

public class Addressnn {

    private int addressid;

    private String addressdetail;

三、表模型

mysql> desc person_nn;

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

| 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_nn;

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

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

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

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

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

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

mysql> desc person_nn;

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

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

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

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

| name     | varchar(255) | YES  |     | NULL    |                |

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

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

四、生成的SQL脚本

/* Formatted on 2007/08/21 11:13 (QP5 v5.50) */

CREATE TABLE `address_nn` (

  `addressid` int(11) NOT NULL auto_increment,

  `addressdetail` varchar(255) default NULL,

  PRIMARY KEY  (`addressid`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/21 11:14 (QP5 v5.50) */

CREATE TABLE `join_nn` (

  `personid` int(11) NOT NULL,

  `addressid` int(11) NOT NULL,

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

  KEY `FKAAB98CF5E008E752` (`personid`),

  KEY `FKAAB98CF5239F6A16` (`addressid`),

  CONSTRAINT `FKAAB98CF5239F6A16` FOREIGN KEY (`addressid`) REFERENCES `address_nn` (`addressid`),

  CONSTRAINT `FKAAB98CF5E008E752` FOREIGN KEY (`personid`) REFERENCES `person_nn` (`personid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

/* Formatted on 2007/08/21 11:14 (QP5 v5.50) */

CREATE TABLE `person_nn` (

  `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>

    <class name="com.lavasoft.dx._n_n.Personnn" table="PERSON_nn">

        <id name="personid">

            <generator class="identity"/>

        </id>

        <property name="name"/>

        <property name="age"/>

        <!--映射集合属性，join_1ntab是连接表表名-->

        <set name="addresses"

             table="join_nn"

                >

            <!--“column="personid"”确定PERSON_1ntab表关联到连接表的外键列名-->

            <key column="personid"/>

            <!--“column="addressid"”关联PERSON_1ntab表的Address1ntab对象的id在连接表中的列名-->

            <many-to-many

                    column="addressid"

                    class="com.lavasoft.dx._n_n.Addressnn"/>

        </set>

    </class>

</hibernate-mapping>

<hibernate-mapping>

    <class name="com.lavasoft.dx._n_n.Addressnn" table="ADDRESS_nn">

        <id name="addressid">

            <generator class="identity"/>

        </id>

        <property name="addressdetail"/>

    </class>

</hibernate-mapping>

六、测试方法

public class Test_nn {

    public static void main(String[] args){

        Addressnn add1=new Addressnn();

        Addressnn add2=new Addressnn();

        Addressnn add3=new Addressnn();

        Personnn p1=new Personnn();

        Personnn p2=new Personnn();

        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 ADDRESS_nn (addressdetail) values (?)

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

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

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

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

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

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

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

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 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 (?)