DB.TField.OldValue
From RAD Studio VCL Reference
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Delphi Information
From DB.pas
property OldValue: Variant read GetOldValue;
Unit: DB
Type: property
Visibility: public
Member Of: TField
C++ Information
From DB.hpp
__property System::Variant OldValue = {read=GetOldValue};
Unit: DB
Type: property
Visibility: public
Member Of: TField
Description
Represents the original value of the field (as a Variant).
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.
Note: the OldValue property is only usable when the data is accessed using a TClientDataSet component or cached updates is enabled.