[MYSQL] Requetes

<?PHP
$code1 = $_POST["code1"];
$code2 = $_POST["code2"];
$code3 = $_POST["code3"];
$code4 = $_POST["code4"];
$code5 = $_POST["code5"];
$code6 = $_POST["code6"];
$code7 = $_POST["code7"];
$code8 = $_POST["code8"];
$code9 = $_POST["code9"];
$serial = $code1."-".$code2."-".$code3."-".$code4."-".$code5."-".$code6."-".$code7."-".$code8."-".$code9;

$annee = $_POST["annee"];
$mois = $_POST["mois"];
$jour = $_POST["jour"];
$valid_until = $annee."-".$mois."-".$jour;

$added_date = "1990-05-01"

echo $serial."     ".$valid_until."     ".$added_date

$connexion = mysql_connect("sql3.byethost9.com","b9_235027","MYPASSWORD")or die(mysql_error());
$db = mysql_select_db("b9_235027_serv1")or die(mysql_error());

$query = mysql_query("INSERT INTO serial(id,serial,added_date,valid_until,used_date,used_by) VALUES('','$serial','$added_date','$valid_until','','');") or die(mysql_error();

mysql_close();

?>