[NumLock]

Код:

unit Unit1;

interface

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

type
  TQueryThread = class(TThread)
  private
    procedure DataSource;
  protected
    procedure Execute; override;
  end;

  TForm1 = class(TForm)
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Query1: TQuery;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TQueryThread.DataSource;
begin
  Form1.DataSource1.DataSet:=Form1.Query1;
end;

procedure TQueryThread.Execute;
begin
  Form1.Query1.Open;
  Synchronize(DataSource);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Query1.DatabaseName:='DBDEMOS';
  Query1.SQL.Text:='select * from country.db';
  with TQueryThread.Create(True) do
  begin
    FreeOnTerminate:=True;
    Resume;
  end;
end;

end.