I am curious to know how you folks have handled locking a database record in a shared application. Basically user 1 selects from a list of records to edit. Normally, I would then immediately go in an write a timestamp that "locks" the record. When user 2 comes I don't allow him/her to edit that record as long as that timestamp is, say... no older then 15 minutes. If it is older, then the "timeout" has been reached and I clear the lock. This is pretty down and dirty way to handle it. How else do folks handle these situations?
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