CI_DB_driver::version PHP Method

    public function version()
    {
        if (isset($this->data_cache['version'])) {
            return $this->data_cache['version'];
        }
        if (FALSE === ($sql = $this->_version())) {
            return $this->db_debug ? $this->display_error('db_unsupported_function') : FALSE;
        }
        $query = $this->query($sql)->row();
        return $this->data_cache['version'] = $query->ver;
    }