public function luuGiaHan()
{
$idctpm = Input::get('idchitietquyensach');
$ngay_gia_han = Input::get('thoigiangiahan');
$ngay_hen_tra = Input::get('thoigianhientai');
$so_ngay_gia_han = (strtotime($ngay_gia_han) - strtotime($ngay_hen_tra)) / 86400;
$id_dk_gh = DangKiGiaHanSach::max('id');
$id_dk_gh = ++$id_dk_gh;
$ngay_gia_han = date('Y-m-d', strtotime($ngay_gia_han));
$result = DB::statement(DB::raw("CALL insert_gia_han_sach(" . $id_dk_gh . "," . $idctpm . "," . $so_ngay_gia_han . ",'" . $ngay_gia_han . "');"));
return Redirect::to('/borrows/tables')->with('success_message', 'Bạn đã gia hạn thành công!');
}
