unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, dbisamtb, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    DBISAMQuery1: TDBISAMQuery;
    DataSource1: TDataSource;
    Button2: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  DBISAMQuery1.SQL.Clear;
  DBISAMQuery1.SQL.Add('insert into dppt (CorrectCode) values (FALSE);');
  DBISAMQuery1.SQL.Add('delete from dppt where datetime < current_timestamp-900000;');
  DBISAMQuery1.SQL.Add('select * from dppt;');
  DBISAMQuery1.ExecSQL;

  if(DBISAMQuery1.RecordCount>5) then
  begin
    Label1.Caption:='PT: '+IntToStr(DBISAMQuery1.RecordCount);
  end
  else
  begin
    Label1.Caption:='Try: '+IntToStr(DBISAMQuery1.RecordCount);
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  DBISAMQuery1.SQL.Clear;
  DBISAMQuery1.SQL.Add('select * from dppt;');
  DBISAMQuery1.ExecSQL;

  if(DBISAMQuery1.RecordCount>5) then
  begin
    Label1.Caption:='PT: '+IntToStr(DBISAMQuery1.RecordCount);
    DBISAMQuery1.SQL.Clear;
    DBISAMQuery1.SQL.Add('delete from dppt where datetime < current_timestamp-900000;');
    DBISAMQuery1.ExecSQL;
  end
  else
  begin
    Label1.Caption:='CC: '+IntToStr(DBISAMQuery1.RecordCount);
    DBISAMQuery1.SQL.Clear;
    DBISAMQuery1.SQL.Add('delete from dppt where datetime < current_timestamp;');
    DBISAMQuery1.ExecSQL;
  end;
end;

end.