SDataSet should handle generated keys

Hi,

I think there is a hole with "records live only in SDataSet" when coming
to generated primary keys: if we want to create a new record that has a
generated pkey, we need a way to create a "temporary" generated key.

This would also mean we need to replace this key with the true one when
the session will begin. Messy.
This change should also be propagated to referencing records...

Before we didn't have the problem, as records didn't need to have a
database-like identity until attached. But now they are attached to the
dataset from the begining...

Any idea on that ?

Franck



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