threak.~pas

这是用Delphi编写的中小企业管理系统

unit threak;

interface      

uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls, ComCtrls;

type
  TBackupthead = class(TThread)
  private
    { Private declarations }
  protected
    procedure Execute; override;
  public
    Procedure BackupDatabase;
  end;

implementation
  uses sjbf,datamodal;
{ Important: Methods and properties of objects in visual components can only be
  used in a method called using Synchronize, for example,

      Synchronize(UpdateCaption);

  and UpdateCaption could look like,

    procedure TBackupthead.UpdateCaption;
    begin
      Form1.Caption := 'Updated in a thread';
    end; }

{ TBackupthead }

procedure TBackupthead.BackupDatabase;
begin
  if Trim(f_sjbf.lj.Text)<>'' then
  begin
    Try
      with Data.Query1 do
      begin
        Close;
        SQL.Clear;
        SQL.Add('Backup DataBase qygl to disk = :a');
        ParamByName('a').Value := Trim(f_sjbf.lj.Text);
        ExecSQL;
      end;
      Application.MessageBox('备份成功.','提示',64);
      f_sjbf.ProBar1.Position := 0;
      Thread1.Terminate;
    Except
      Application.MessageBox('系统出错.','提示',64);
      f_sjbf.Close;
    end;
  end;
end;

procedure TBackupthead.Execute;
begin
  while f_sjbf.ProBar1.Position < f_sjbf.ProBar1.Width do
    f_sjbf.ProBar1.Position := f_sjbf.ProBar1.Position+2;
end;

end.