In the original question I did put it was untested and showed the query as: 

y $cards = $dbh->prepare("SELECT Card_idCard FROM CardList WHERE User_
+idUser = $user_number AND visible = 1 ORDER BY metric");

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But you are right to point out this undefined behaviour. However, when written as you suggest, it always returns true (I haven't completely got my head around why) and the loop doesn't end. It needs to be written like this: 
my $card;
while (($card) = $cards->fetchrow_array)

[download]

In reply to Re^2: Ordering Template cards by Bod
in thread Ordering Template cards by Bod

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