Hi all,

I have 2 objects linked with many-to-many relation (using many-to-many mapping), see hibernate mapping file fragment on the bottom.

Everything works fine when I create object (also with relations specified in documentCollections property), retrieve, update it also with documentCollections property set.

But I want also to be able to update just parent table and don't touch childs. But if I set documentCollections to null, it deletes all references to child objects.

Is there a way to do it easy?

Regards,
Andrei


<hibernate-mapping default-cascade="all">
<class name="ModulePO" table="MODULE">

.....

<set name="documentCollections" table="MOD_DC" lazy="true" cascade="all">
<key>
<column name="FK_MODULE_ID" not-null="true" />
</key>
<many-to-many class="DocumentCollectionPO" fetch="join" unique="true">
<column name="FK_DOCUMENTCOLLECTION_ID" not-null="true" />
</many-to-many>
</set>
</class>
</hibernate-mapping>

One question. Why do you set documentCollections to null?


You can find it here: http://www.hibernate.org/hib_docs/nhibernate/1.2/reference/en/html/collections.html