Hibernate中 一个单向多对多例子

1. User 类及映射文件

public class User {

 private Long id;
 private String name;
 private String passWord;
 private Set services = new HashSet();
 省去方法.

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.wks.pojo" >
 <class name="User" table="USER">
  <id name="id" type="long" column="ID" unsaved-value="0">
   <generator class="native" />
  </id>
  <property name="name" column="NAME" type="string" />
  <property name="passWord" column="PWD" type="string" not-null="true" />
  <set name = "services"
  table = "UserService"
  lazy="false"
        cascade="save-update"
  >
   <key column = "userID"/>
   <many-to-many column = "serviceID" class = "WSService"/>
  </set>
 </class>
</hibernate-mapping>

2. WSService类及映射文件

public class WSService {
 private Long id;
 private String name; 

 省去方法.

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.wks.pojo" >
 <class name="WSService" table="SERVICE">
  <id name="id" column="ID" type="long" unsaved-value="0">
   <generator class="native" />
  </id> 
 <property name="name" column="NAME" type="string" />
 </class>
 
</hibernate-mapping>

3.当从映射文件产生数据库表时,会自动产生三个表:U SER, SERVICE , UserService

其中UserService中有两个字段:userID, serviceID

有三个数据库表,其中一个为关联表