unit1.pas

Delphi函数参考大全的CD

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, DB, ADODB, Grids, DBGrids;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    DateTimePicker1: TDateTimePicker;
    DateTimePicker2: TDateTimePicker;
    Label1: TLabel;
    Label2: TLabel;
    Profit: TEdit;
    Label3: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  With ADOQuery1 do
  begin
    Close;
    SQL.Clear;
    SQL.Add('select sum(sellprice - price) from tb_sell where timedate >= :fromdate and timedate< :todate');
    Parameters.ParamByName('fromdate').Value := Trunc(DateTimePicker1.DateTime);
    Parameters.ParamByName('todate').Value := Trunc(DateTimePicker2.DateTime);
    Open;
  end;
  if ADOQuery1.Fields[0].Value<>null then
  begin
    Profit.Text := FloatToStr(Int(ADOQuery1.Fields[0].Value));
  end;
end;

end.