one thing i saw immediately is that you have an unecessary use DBI; in the connect sub, that may cause your $dbh to go out of scope, i'm not sure. Problem with the script as it is now, it that you are not error checking So you are not raising and error until you actully try to fetch data.

Try something like this on each DB call to pinpoint the problem

$dbh= DBI->connect("DBI:mysql:host=localhost;database=testsites","qaus
er","blah",{PrintError => 0, RaiseError => 1}) or die $DBI::errstr;

-and-

$sth = $dbh->prepare ($stmt) or die $dbh->errstr;
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Update: swiftone has a good eye. I believe the finish call is your real problem. but ALWAYS check for failure on db calls.