| 一、模型介紹 |
| 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表關聯(lián)到連接表的外鍵列名--> |
| <key column="personid"/> |
| <!--“column="addressid"”關聯(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 (?, ?) |
新聞熱點
疑難解答
