hibernate实例简析-hibernate_many2many

本文详细介绍了如何利用Hibernate框架通过单向User到Role映射实现多对多关联关系的配置与操作，包括角色的创建、保存和用户与角色之间的关系建立。通过实例代码演示了如何在数据库中建立角色表和用户表，以及如何通过集合属性实现用户和多个角色的关联。

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hibernate多对多关联映射(单向User---->Role)

具体映射方式：
<set name="roles" table="t_user_role">
<key column="userid"/>
<many-to-many class="com.bjsxt.hibernate.Role" column="roleid"/>
</set>
===
<hibernate-mapping>
<class name="com.bjsxt.hibernate.Role" table="t_role">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
</class>
</hibernate-mapping>
---
<hibernate-mapping>
<class name="com.bjsxt.hibernate.User" table="t_user">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="roles" table="t_user_role">
<key column="userid"/>
<many-to-many class="com.bjsxt.hibernate.Role" column="roleid"/>
</set>
</class>
</hibernate-mapping>
===
Role r1 = new Role();
r1.setName("数据录入人员");
session.save(r1);

Role r2 = new Role();
r2.setName("商务主管");
session.save(r2);

Role r3 = new Role();
r3.setName("大区经理");
session.save(r3);

User u1 = new User();
u1.setName("10");
Set u1Roles = new HashSet();
u1Roles.add(r1);
u1Roles.add(r2);
u1.setRoles(u1Roles);

User u2 = new User();
u2.setName("祖儿");
Set u2Roles = new HashSet();
u2Roles.add(r2);
u2Roles.add(r3);
u2.setRoles(u2Roles);

User u3 = new User();
u3.setName("杰伦");
Set u3Roles = new HashSet();
u3Roles.add(r1);
u3Roles.add(r2);
u3Roles.add(r3);
u3.setRoles(u3Roles);

session.save(u1);
session.save(u2);
session.save(u3);
---
User user = (User)session.load(User.class, 1);
System.out.println(user.getName());
for (Iterator iter=user.getRoles().iterator(); iter.hasNext();) {
Role role = (Role)iter.next();
System.out.println(role.getName());
}
===
public class User {

private int id;

private String name;

private Set roles;
===
public class Role {

private int id;

private String name;