procedure TForm1.查询1Click(Sender: TObject);
begin
  var url: TynUrl := TynUrl.Create;
  var serial: TynSerial := TynSerial.Create;
  var send: TMemoryStream := TMemoryStream.Create;
  try
    url.url := 'http://127.0.0.1:5566';
    url.command := 'query8';
    url.params.Add('accountno=1');
    url.params.Add('sql=select * from tunit');
    serial.Text := http.Post(url.text, send);
    serial.ReadFDDataSet('dataset', FDMemTable1);
  finally
    serial.Free;
    send.Free;
    url.Free;
  end;
end;