$sth->execute or die $sth->errstr;
my %taxclasses = map { $_->[0] => 1 } @{$sth->fetchall_arrayref};
@{ $opt{'taxclasses'} } = grep $_, keys %taxclasses;
$sth->execute or die $sth->errstr;
my %taxclasses = map { $_->[0] => 1 } @{$sth->fetchall_arrayref};
@{ $opt{'taxclasses'} } = grep $_, keys %taxclasses;