many to many 的关系如何保存？

配置了many to many关系，
数据读取，建表都没有问题

[code:1]<bag name="popedoms" lazy="true" table="EXM_ROLE_POPEDOM" cascade="all" inverse="true">
<key>
<column name="ROLE_ID" sql-type="INT(10)"/>
</key>
<many-to-many class="eg.PopedomVO" insert="true" update="true">
<column name="POPEDOM_ID" sql-type="INT(10)"/>
</many-to-many>
</bag>[/code:1]

但是save的时候，他没有插EXM_ROLE_POPEDOM表，是没有这个功能还是我代码写的不对？

[code:1] RoleVO role = (RoleVO) obj;
if (null != popedoms) {
List tmp = new ArrayList();
for (int i = 0; i < popedoms.length; i++) {
PopedomVO popdom = dao.selectByPK(popedoms[i].longValue());
//popdom.getRoles().add(role);
tmp.add(popdom);
}
role.setPopedoms(tmp);
}
ds.insert(role);[/code:1]

其中PopedomVO已经有数据，现新增加一条RoleVO记录，关联上几条PopedomVO数据。但是RoleVO插进去了，关机就是没有，请教了……

[code:1]
inverse="true"
[/code:1]
这里错了，应该为默认的"false"

试过了，也不灵

[code:1] <bag name="popedoms" lazy="true" table="EXM_ROLE_POPEDOM" cascade="all" role="popedoms">
<key>
<column name="ROLE_ID" sql-type="INT(10)"/>
</key>
<many-to-many class="cn.mBig.experience.vo.PopedomVO">
<column name="POPEDOM_ID" sql-type="INT(10)"/>
</many-to-many>
</bag>[/code:1]

[code:1] RoleVO role = (RoleVO) obj;
PopedomDAO dao = new PopedomDAO(ds);
if (null != popedoms) {
List tmp = new ArrayList();
for (int i = 0; i < popedoms.length; i++) {
PopedomVO popdom = dao.selectByPK(popedoms[i].longValue());
tmp.add(popdom);
}
role.setPopedoms(tmp);
}
session.saveOrUpdate(role);
session.flush();[/code:1]

[code:1]
但是RoleVO插进去了，关机就是没有，请教了……
[/code:1]
不是很明白你的意思，请提供详细的代码及映射。

打错了，应该是“关系就没保存”
就是Role 和 Popedom 的link table EXM_ROLE_POPEDOM 没有被记录

role 对 popedom是多对多的关系，这两张表通过role_popedom对应起来。

现在有一些popedom记录，希望在插入新的role的时候，同时确定role_popedom的关系并且插到link table中。

role的数据是通过页面输入的，通过checkbox选择需要的popedomId 放入数组。

根据popedomId 取得对应的 popedom实例，增加到role的List形的 popedoms里，保存role.

结果只hibernate只insert了role表，没搭理role_popedom...

请提供 完整的 代码及映射。

[code:1] <class name="eg.RoleVO" table="EXM_ROLE">

<id name="id" type="java.lang.Long" unsaved-value="0">
<column name="ID" sql-type="INT(10)"/>
<generator class="identity"/>
</id>
<property name="name">
<column name="NAME" not-null="true" sql-type="VARCHAR(40)"/>
</property>
<property name="creationDate" type="timestamp" column="CREATIONDATE"/>
<property name="modificationDate" type="timestamp" column="MODIFICATIONDATE"/>

<property type="java.lang.Long" name="creationUid">
<column name="CREATION_USER_ID" sql-type="INT(10)"/>
</property>
<property type="java.lang.Long" name="modificationUid">
<column name="MODIFICATION_USER_ID" sql-type="INT(10)"/>
</property>

<property name="description">
<column name="DESCRIPTION" sql-type="VARCHAR(255)"/>
</property>
<bag name="popedoms" lazy="true" table="EXM_ROLE_POPEDOM" cascade="all">
<key>
<column name="ROLE_ID" sql-type="INT(10)"/>
</key>
<many-to-many class="eg.PopedomVO" insert="true" update="true">
<column name="POPEDOM_ID" sql-type="INT(10)"/>
</many-to-many>
</bag>
<property type="java.lang.Byte" name="state">
<column name="STATE" sql-type="TINYINT(1)"/>
</property>
</class>

<class name="eg.PopedomVO" table="EXM_POPEDOM">

<id name="id" type="java.lang.Long" unsaved-value="0">
<column name="ID" sql-type="INT(10)"/>
<generator class="identity"/>
</id>
<property name="name">
<column name="NAME" not-null="true" sql-type="VARCHAR(40)"/>
</property>
<property name="description">
<column name="DESCRIPTION" sql-type="VARCHAR(255)"/>
</property>
</class>[/code:1]



[code:1] private Session s;
private Long[] popedomPKs;

private void insert() throws DAOException {
RoleVO role = (RoleVO) obj;
if (null != popedomPKs) {
List tmp = new ArrayList();
for (int i = 0; i < popedomPKs.length; i++) {
PopedomVO popdom = selectByPK(popedomPKs[i]);
tmp.add(popdom);
}
role.setPopedoms(tmp);
}
session.saveOrUpdate(role);
session.flush();
}

private PopedomVO selectByPK(Long id) throws
DAOException {
PopedomVO vo = null;
try {
vo = new PopedomVO();
s.load(vo, id);
}
catch (Exception e) {
throw new DAOException(e);
}
return vo;
}[/code:1]

[code:1]
if (null != popedoms) {
List tmp = new ArrayList();
for (int i = 0; i < popedoms.length; i++) {
PopedomVO popdom = dao.selectByPK(popedoms[i].longValue());
tmp.add(popdom);
}
role.setPopedoms(tmp);
}
[/code:1]
确定if(null != popedoms)为true吗?

确定！贴上的代码把调试输出去掉了，下面的是原来的，
tmp里数据都是正确的

[code:1]
private Session s;
private Long[] popedomPKs;

private void insert() throws DAOException {
RoleVO role = (RoleVO) obj;
System.err.println("====================");
if (null != popedomPKs) {
System.err.println(popedoms[i]);
List tmp = new ArrayList();
for (int i = 0; i < popedomPKs.length; i++) {
PopedomVO popdom = selectByPK(popedomPKs[i]);
tmp.add(popdom);
}
role.setPopedoms(tmp);
}
for (java.util.Iterator i = tmp.iterator(); i.hasNext(); ) {
System.err.println( ( (PopedomVO) i.next()).getName());
}
session.saveOrUpdate(role);
session.flush();
}
[/code:1]

把所有代码，映射贴出来吧，帮你调试一下。