RAD Studio VCL Reference
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Represents the original value of the field (as a Variant).
property OldValue: Variant;
__property Variant OldValue;
Read the OldValue property to examine or retrieve the original value of the field that was obtained from the dataset before any edits were posted. For example, in Delphi the following line replaces current pending changes with a field's original value:
NewValue :=OldValue;
Once records are applied successfully to the database, the old field value cannot be retrieved.
Reconciling Update Errors
Resolving Update Errors On the Provider
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