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Hibernate version: 3.2

A question about cascading . . .

Let's say I have a table "A" which maps to class "A" and
a table "B" which maps to class "B"

Their relationship is one-to-many, that is A can have many B's.

Table and class B contains idA, a foreign key to A.

Now let's say I delete a record from A and I want the corresponding idA in B to be set to null. How should I set the cascade option here?

<bag name="BList">
<key column="idA"/>
<one-to-many class="B"/>
</bag>

Thanks

Eric