public function initConnection(PDO $con, array $settings)
    {
        $con->exec("ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD'");
        $con->exec("ALTER SESSION SET NLS_TIMESTAMP_FORMAT='YYYY-MM-DD HH24:MI:SS'");
        if (isset($settings['queries']) && is_array($settings['queries'])) {
            foreach ($settings['queries'] as $queries) {
                foreach ((array) $queries as $query) {
                    $con->exec($query);
                }
            }
        }
    }