Hibernate 一对多连接表双向关联
一对多（one to many） /多对一（ many to one）
基于连接表的双向一对多关联。注意inverse="true"可以出现在关联的任意一端，即collection端或者join端。
<class name="Person">
<id name="id" column="personId">
<generator class="native"/>
</id>
<set name="addresses"
table="PersonAddress">
<key column="personId"/>
<many-to-many column="addressId"
unique="true"
class="Address"/>
</set>
</class>
<class name="Address">
<id name="id" column="addressId">
<generator class="native"/>
</id>
<join table="PersonAddress"
inverse="true"
optional="true">
<key column="addressId"/>
<many-to-one name="person"
column="personId"
not-null="true"/>
</join>
</class>
create table Person ( personId bigint not null primary key ) create table PersonAddress ( personId bigint not null, addressId bigint not null primary key ) create table Address ( addressId bigint not null primary key )
@Test
public void addTest(){
Address1nbitab adr1 = new Address1nbitab();
Address1nbitab adr2 = new Address1nbitab();
Person1nbitab per = new Person1nbitab();
adr1.setAddrDetail("aaaaaaaaaaaaaaaaaaaa");
adr2.setAddrDetail("bbbbbbbbbbbbbbbbbbbb");
per.setName("1nbitab test");
//adr1.setPerson1ntab_bi(per);
//adr2.setPerson1ntab_bi(per);
per.getAddresses().add(adr1);
per.getAddresses().add(adr2);
Session s = null;
Transaction tx = null;
try{
s=HibernateUtil.getCurrentSession();
tx = s.beginTransaction();
s.save(per);
s.save(adr1);
s.save(adr2);
tx.commit();
}finally{
HibernateUtil.closeSession();
}
}
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Hibernate 一对多连接表双向关联
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一、模型介绍
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一个人（Person）对应多个地址（Address）。
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二、实体（省略getter、setter方法）
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public class Person1ntab_sx {
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private int personid;
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private String name;
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private int age;
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private Set addresses=new HashSet();
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public class Address1ntab_sx {
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private int addressid;
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private String addressdetail;
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private Person1ntab_sx person1ntab_sx;
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三、表模型
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mysql> desc person_1ntab_sx;
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+----------+--------------+------+-----+---------+----------------+
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| Field | Type | Null | Key | Default | Extra |
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+----------+--------------+------+-----+---------+----------------+
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| personid | int(11) | NO | PRI | NULL | auto_increment |
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| name | varchar(255) | YES | | NULL | |
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| age | int(11) | YES | | NULL | |
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+----------+--------------+------+-----+---------+----------------+
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mysql> desc address_1ntab_sx;
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+---------------+--------------+------+-----+---------+----------------+
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| Field | Type | Null | Key | Default | Extra |
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+---------------+--------------+------+-----+---------+----------------+
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| addressid | int(11) | NO | PRI | NULL | auto_increment |
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| addressdetail | varchar(255) | YES | | NULL | |
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+---------------+--------------+------+-----+---------+----------------+
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mysql> desc join_1ntab_sx;
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+-----------+---------+------+-----+---------+-------+
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| Field | Type | Null | Key | Default | Extra |
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+-----------+---------+------+-----+---------+-------+
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| addressid | int(11) | NO | PRI | | |
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| personid | int(11) | NO | PRI | | |
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+-----------+---------+------+-----+---------+-------+
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四、生成的SQL脚本
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/* Formatted on 2007/08/22 17:52 (QP5 v5.50) */
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CREATE TABLE `address_1ntab_sx` (
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`addressid` int(11) NOT NULL auto_increment,
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`addressdetail` varchar(255) default NULL,
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PRIMARY KEY (`addressid`)
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) ENGINE=InnoDB DEFAULT CHARSET=gbk;
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/* Formatted on 2007/08/22 17:52 (QP5 v5.50) */
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CREATE TABLE `person_1ntab_sx` (
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`personid` int(11) NOT NULL auto_increment,
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`name` varchar(255) default NULL,
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`age` int(11) default NULL,
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PRIMARY KEY (`personid`)
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) ENGINE=InnoDB DEFAULT CHARSET=gbk;
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/* Formatted on 2007/08/22 17:52 (QP5 v5.50) */
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CREATE TABLE `join_1ntab_sx` (
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`addressid` int(11) NOT NULL,
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`personid` int(11) NOT NULL,
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PRIMARY KEY (`personid`,`addressid`),
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KEY `FK8F869F61F93DDD6` (`personid`),
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KEY `FK8F869F61FC0F682A` (`addressid`),
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CONSTRAINT `FK8F869F61FC0F682A` FOREIGN KEY (`addressid`) REFERENCES `address_1ntab_sx` (`addressid`),
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CONSTRAINT `FK8F869F61F93DDD6` FOREIGN KEY (`personid`) REFERENCES `person_1ntab_sx` (`personid`)
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) ENGINE=InnoDB DEFAULT CHARSET=gbk;
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五、映射方法
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<hibernate-mapping>
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<class name="com.lavasoft.sx._1_n_tab.Person1ntab_sx" table="PERSON_1ntab_sx">
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<id name="personid">
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<generator class="identity"/>
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</id>
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<property name="name"/>
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<property name="age"/>
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<!--映射集合属性，关联到持久化类-->
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<!--table="join_1ntab_sx"指定了连接表的名字-->
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<set name="addresses"
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table="join_1ntab_sx"
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cascade="all">
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<!--column="personid"指定连接表中关联当前实体类的列名-->
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<key column="personid" not-null="true"/>
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<!--unique="true"表示当前实体类是"1",不是"n"-->
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<many-to-many column="addressid"
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unique="true"
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class="com.lavasoft.sx._1_n_tab.Address1ntab_sx"/>
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</set>
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</class>
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</hibernate-mapping>
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<hibernate-mapping>
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<class name="com.lavasoft.sx._1_n_tab.Address1ntab_sx"
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table="ADDRESS_1ntab_sx">
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<id name="addressid">
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<generator class="identity"/>
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</id>
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<property name="addressdetail"/>
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<!--映射关联属性，column属性指定外键列名-->
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<join table="join_1ntab_sx"
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inverse="true"
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optional="true">
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<key column="addressid"/>
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<many-to-one name="person1ntab_sx"
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column="personid"
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cascade="all"
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not-null="true"/>
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</join>
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</class>
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</hibernate-mapping>
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六、测试方法
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public class Test_1ntab_sx {
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public static void main(String[] args){
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Address1ntab_sx add1=new Address1ntab_sx();
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Address1ntab_sx add2=new Address1ntab_sx();
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Person1ntab_sx p=new Person1ntab_sx();
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add1.setAddressdetail("郑州市经三路");
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add2.setAddressdetail("合肥市宿州路");
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p.setName("wang");
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p.setAge(30);
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p.getAddresses().add(add1);
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p.getAddresses().add(add2);
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add1.setPerson1ntab_sx(p);
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add2.setPerson1ntab_sx(p);
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Session session= HibernateUtil.getCurrentSession();
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Transaction tx=session.beginTransaction();
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// session.save(p);
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session.saveOrUpdate(add1);
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session.saveOrUpdate(add2);
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tx.commit();
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HibernateUtil.closeSession();
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}
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}
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七、测试结果
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1) :正常保存.
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// session.save(p);
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session.saveOrUpdate(add1);
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session.saveOrUpdate(add2);
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Hibernate: insert into PERSON_1ntab_sx (name, age) values (?, ?)
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Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)
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Hibernate: insert into ADDRESS_1ntab_sx (addressdetail) values (?)
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Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)
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Hibernate: insert into join_1ntab_sx (personid, addressid) values (?, ?)
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