It should go into the "IF" when no rows are returned....
thats the what I want to do ....but it doesn't go into this
IF
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my $sth = $dbh->prepare("SELECT * FROM routes WHERE pattern = 'A2Z'");
$sth->execute;
$res = $sth->fetchrow_hashref;
$sth->finish;

if (!$res->{pattern})
{
   print STDERR "Hello World\n";
}