$dbh->do is generally used for non select statements. Read up on

$sth = $dbh->prepare(...);
$sth->execute(...);
$result_var = $sth->fetch...;
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(Note that there are many different 'fetch'es, so take your pick as suits your needs). Tutorials is a good place to start, and there are plenty of DBI examples in the various nodes in the Monestary.

rdfield