Doctrine\DBAL\Connection::getDatabasePlatformVersion PHP Method

    private function getDatabasePlatformVersion()
    {
        // Driver does not support version specific platforms.
        if (!$this->_driver instanceof VersionAwarePlatformDriver) {
            return null;
        }
        // Explicit platform version requested (supersedes auto-detection).
        if (isset($this->_params['serverVersion'])) {
            return $this->_params['serverVersion'];
        }
        // If not connected, we need to connect now to determine the platform version.
        if (null === $this->_conn) {
            $this->connect();
        }
        // Automatic platform version detection.
        if ($this->_conn instanceof ServerInfoAwareConnection && !$this->_conn->requiresQueryForServerVersion()) {
            return $this->_conn->getServerVersion();
        }
        // Unable to detect platform version.
        return null;
    }