Put your instert inside a transaction like this:
#you can decide to combine prepare() and execute() into do()
$dbh->do( "insert into userinfo values ('$fvalue','$lvalue','$email')" );
#check if the transaction went ok
Tim Bunce (the Auteur of DBI) gave a nice presentation about
"DBI transactions" that you can find from this link:
http://dbi.perl.org (Online Doentation)
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