[bulc]

Código Delphi [-]
Function GET_GEN ( IBQuery1 : TIBQuery ) : Integer;  // You can add more parameters like: GEN_NAME : String, and TDBGrid, etc...
// Called by KeyDown event using Key = VK_INSERT  
Begin
    IBQuery1.Close;
   IBQuery1.Clear;
   IBQuery.SQL.Add( 'Select GEN_ID( 'GEN_NUM_TALLER', 0) FROM RDB$DATABASE' ); //Extract without alteration
   IBQuery.Open;
   Result := IBQuery1.Fields[0].AsInteger; // ¿Se podría extraer el dato de algún otro modo?
End;