Hi, I have a parent child relationship.

In parent.hbm.xml

<set name="child" lazy="true" cascade="all, delete-orphan"
table="child_table">
<key column="parent_id" />
<one-to-many class="Child" />
</set>

I Child.hbm.xml

<many-to-one name="toParent"
class="Parent"
column="parent_id" />

The problem is that after updating parent with some code like this one:

Parent p = new Parent();
Set foo = new Hashset();
foo.add(new Child());
p.setChilds(foo);

I dont get old childs before this update deleted from child database table.
I know it is a basic question, but even reading the hibernate documentation I cannot figure it out how to get this basic operation done.