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Hibernate 多對多單向關(guān)聯(lián)

2019-11-10 20:25:46
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Hibernate 多對多單向關(guān)聯(lián)
 
 
一、模型介紹
多個人（Person）對應多個地址（Address）。
一個人可對應多個地址，一個地址也可以對應多個人。 
二、實體（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腳本
 
/* 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"/>
        <!--映射集合屬性，join_1ntab是連接表表名-->
        <set name="addresses"
             table="join_nn"
                >
            <!--“column="personid"”確定PERSON_1ntab表關(guān)聯(lián)到連接表的外鍵列名-->
            <key column="personid"/>
            <!--“column="addressid"”關(guān)聯(lián)PERSON_1ntab表的Address1ntab對象的id在連接表中的列名-->
            <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、測試方法
 
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("鄭州市經(jīng)三路");
        add2.setAddressdetail("合肥市宿州路");
        add3.setAddressdetail("北京市長安路");
        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、測試結(jié)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: insert into join_nn (personid, addressid) values (?, ?)
 

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