Questions And Answers for PowerBuilder Interviews

Question

What is concurrency control? How do you control it from the PowerBuilder?

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Answer

When multiple users are working on the same data, we have to make sure that we don't corrupt others changes, either by updating their changes without looking at them or by any other means. When we apply changes to the database, we have to make sure that no body changed the data between your read and update. This can be controlled (not exactly controlling, but, we can detect) using the appropriate WHERE clause option in the update properties in the DataWindow painter.

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