Database level is not a good place to check that. For example, it is currently considered best practice to use COM+ for distributed applications on a Windows platform. Doing this, you should have COM+ business objects start transactions with data objects using them. You can't do that if the database detects changes.

>That's an interesting problem and I'd like to hear other opinions here as well. It may be a better idea, especially in WEB based application, where changes are done through web forms and Java scripts handle problems without requiring a trip to the server.
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>Of course, your idea requires special form and user control classes, but I'm sure you have them developed already in your framework.
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>In The MereMortals framework for VFP the data changes are detected on the database level, that creates an extra complexity.