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$sql = "SELECT user_type FROM usersTable WHERE (username = $user_name)
+;
$sth = $dbh->prepare($sql) or die("Could not prepare!" . $dbh->errstr)
+;
$sth->execute() or die("Could not execute!" . $dbh->errstr);

$sql = "SELECT user_type FROM usersTable WHERE (username = ?)";
$sth = $dbh->prepare($sql) or die("Could not prepare!" . $dbh->errstr)
+;
$sth->execute($user_name) or die("Could not execute!" . $dbh->errstr);