Updating Records
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When performing cached update operations, Delphi may put the dataset into dsNewValue, dsOldValue, or dsCurValue states temporarily. These states indicate that the corresponding properties of a field component (NewValue, OldValue, and CurValue, respectively) are being accessed, usually in an OnUpdateError event handler. Your applications cannot see or set these states. For more information about using cached updates, see Working with Cached Updates.