mysql_query("INSERT INTO enter ( login, sum, date, status, paysys, service) VALUES ( :user, :amount, '" . time() . "', '2', 'kassa', 'bal')");
mysql_query("UPDATE `{$this->config['table']}` SET `{$this->config['column_money']}` = {$this->config['column_money']} + :amount WHERE `{$this->config['column_user']}` = :user");
P.S: это просто пример на скорую руку...