----- Original Message -----
From: "Jon Dart" <[EMAIL PROTECTED]>
I agree that Jon with what Jon said. I'm not sure that complex concurrency is
solvable in a general manner.
> Plus optimistic locking is hard to implement portably because of database
> variations. Oracle has a timestamp type but this isn't portable. Some
> databases have auto-increment columns which can be very handy for
> implementing this but others don't or the semantics or the SQL differ.
But all databases support a String or int type, and instead of a timestamp or
autoinc field, you could be writing a UID instead.
jim
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