my request php mysql can not update

Question

<?php
include "../conn.php";
if( isset($_POST['edite']) )
    {
$id=$_GET['id'];
$code=$_GET['code'];
$nom=$_GET['nom'];
$adresse=$_GET['adresse'];

$query=("UPDATE clients SET  CodeClient= '$code',Nom='$nom',Adresse='$adresse'  WHERE user_id='$id'") or die(mysql_error());

 if(mysqli_query($con,$query)){

    echo "Modification réussie!";

}

else{
    echo"Erreur modification";
}
}
    mysqli_close($con);

?>

<?php

   while($row=mysqli_fetch_assoc($result)){
       $code=$row['CodeClient'];
       $nom=$row['Nom'];
       $adresse=$row['Adresse'];
     }
?>


<input type="hidden" name="id" value="<?php echo $row['user_id'];?>">
<div class="form-group">
<label>Code Distributeur</label>
<input type="text" name="code" class="form-control" value="<?php echo $row['CodeClient'];?>">
</div>


<div class="form-group">
<label>Nom Distributeur</label>
<input type="text" name="nom" class="form-control" value="<?php echo $row['Nom'];?>">
</div>


<div class="form-group">
<label>Adresse Distributeur</label>
<input type="text" name="adresse" class="form-control" value="<?php echo $row['Adresse'];?>">
</div>
<button type="submit" name="edite" class="btn bg-success btn-block">Modifier</button>
<?php


?>


</form>

</div>


</body>
</html>

above my code