hibernate 单向关联保存多方是外键为null

尽管叫我疯子_ 2014-02-02 09:02:34

问题描述：user 和 purview 是单向关联的多对一关系，其中 user是一方，purview是多方，当我在插入多方数据时，外键（user_id）为null

实体类：



/*

 * 系统用户数据模型

 */

public class User {

     

private int user_id;

    private String username;

    private String password;

    private int sex;    //1:男 ；0:女

    private int age;

    private int identity; //身份  --1:管理员;2:学生;3:教师

     

 

/*省略setter getter 方法 */

}



/*

 *用户权限数据模型 

*/

public class Purview {

    private int pid;

    private User user;

    private String pname;

    private String obj;//操作对象：数据库中的表

    private int type; //操作类型，增删改查依次为：1,2,3,4

     

     

 

 

/*省略setter getter 方法*/

 

}

配置文件：



<hibernate-mapping>

 

    <class name="bean.User" table="bcw_user">

        <id name="user_id" column="user_id">

            <generator  class="sequence">

                <param name="sequence" >bcw_user_seq</param>

            </generator>

        </id>

        

        <property name="username" type="string"/> 

        <property name="password" type="string"></property>

        <property name="sex" ></property>

        <property name="age"  />  

        <property name="identity" ></property>   

         

    </class>

 

</hibernate-mapping>



<hibernate-mapping>

 

    <class name="bean.Purview" table="bcw_purview">

        <id name="pid" column="p_id">

            <generator  class="sequence">

                <param name="sequence" >bcw_purview_seq</param>

            </generator>

        </id>

        

        

        <property name="obj" type="string"/> 

        <property name="pname" type="string"></property>

        <property name="type" ></property>

         

        <many-to-one name="user" fetch="select" column="user_id"  class="bean.User" outer-join="true"/>

             

     </class>

 

</hibernate-mapping>

测试代码：



public static void main(String[] d) {

        HibernateUtil util = new HibernateUtil();

        Session session = util.getSession();

        Transaction tx = session.beginTransaction();

        User user = (User) session.get(User.class, 21);

        //System.out.println(user+"\t"+user.getUser_id());

        Purview p = new Purview();

         

        p.setObj("bcw_source");

        p.setPname("add source");

        p.setType(1);

        p.setUser(user);session.saveOrUpdate(p);

        tx.commit();

         

    }

要保存的purview 中的 user 对象是从数据库中取出然后set到purview对象中的，purview对象存入数据库操作是成功的，但外键为空，无法成功插入。

控制台显示为:



Hibernate: select user0_.user_id as user1_0_0_, user0_.username as username0_0_, user0_.password as password0_0_, user0_.sex as sex0_0_, user0_.age as age0_0_, user0_.identity as identity0_0_ from bcw_user user0_ where user0_.user_id=?

Hibernate: select bcw_purview_seq.nextval from dual

Hibernate: insert into bcw_purview (obj, pname, type, user_id, p_id) values (?, ?, ?, ?, ?)

百度了很久没有解决，希望各位大神不吝赐教

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