Data.DB.TFieldDef.InternalCalcField
Delphi
property InternalCalcField: Boolean read FInternalCalcField write FInternalCalcField;
C++
__property bool InternalCalcField = {read=FInternalCalcField, write=FInternalCalcField, nodefault};
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| property | public | Data.DB.pas Data.DB.hpp |
Data.DB | TFieldDef |
Description
Determines if the field is calculated by the underlying database.
Read InternalCalcField to find out if the field represents a value provided by the underlying database but is not a field in the physical database table. Internally calculated fields are calculated by SQL servers or the Borland Database Engine in a live query view and stored in the dataset like data fields.
For example, in the following SQL statement, the dataset includes a field for the calculated value ONHAND * COST.
SELECT PartNo, Description, OnHand, Cost, (OnHand * Cost) FROM PARTS
When the TQuery object has its RequestLive property set to true, the field definition for that calculated value will have InternalCalcField set to true.
InternalCalcField is a read-only property.