hibernate 多对多关联的实现

a)java代码

public class DefaultFile {

private Set tagSet;

………………………………

/**

*

* @author weip

* @return

* @time 2006-1-13 13:48:29

*

* @hibernate.set lazy="true" cascade="save-update" table="FileTagRel"

* @hibernate.collection-key column="fileId"

* @hibernate.collection-many-to-many class="mofile.share.domain.FileTag"

* column="tagId"

*/

public Set getTagSet() {

return tagSet;

}

…………………………...

}

public class DefaultUser{

private Set allFileSet;

…………………………………..

/**

*

* @author weip

* @return

* @time 2006-1-13 13:18:35

*

* @hibernate.set

* lazy="true"

* cascade="all-delete-orphan"

* @hibernate.collection-key

* column="userId"

* @hibernate.collection-one-to-many

* class="mofile.share.domain.DefaultFile"

*/

public Set getAllFileSet() {

return allFileSet;

}

……………………………………...

}

b)映射文件

DefaultFile.hbm.xml

…………………..

<set

name="tagSet"

table="FileTagRel"

lazy="true"

cascade="all"

sort="unsorted"

>

<key

column="fileId"

>

</key>

<many-to-many

class="mofile.share.domain.FileTag"

column="tagId"

outer-join="auto"

/>

</set>

…………………..

FileTag.hbm.xml

…………………..

<set

name="fileSet"

table="FileTagRel"

lazy="true"

cascade="none"

sort="unsorted"

>

<key

column="tagId"

>

</key>

<many-to-many

class="mofile.share.domain.DefaultFile"

column="fileId"

outer-join="auto"

/>

</set>

…………………..

c)数据库

4）Dao

public void saveObject(Object o) {

getHibernateTemplate().saveOrUpdate(o);

}