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# bad kludge, I haven't figured out how to handle this, but 
# if the query doesn't return anything, this function fails;
    if($query =~ /SELECT/i) {
        $return_data = $sth->fetchall_arrayref();
    }

sub update_price
{
...

    return $price;
}

    my %items = parse_input($options{u}, $parts_algo);