main.pas

《Delphi开发人员指南》配书原码

unit Main;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Grids, DBGrids, DB, DBTables, ExtCtrls, DBCtrls;

type
  TForm1 = class(TForm)
    Table1: TTable;
    Table1OrderNo: TFloatField;
    Table1CustNo: TFloatField;
    Table1ItemsTotal: TCurrencyField;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Table1WholesaleTotal: TCurrencyField;
    Table1CustName: TStringField;
    Table2: TTable;
    DBNavigator1: TDBNavigator;
    procedure Table1CalcFields(DataSet: TDataSet);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Table1CalcFields(DataSet: TDataSet);
begin
  DataSet['WholesaleTotal'] := DataSet['ItemsTotal'] * 0.68;
end;

end.