public function getVersion(): string
	{
		if (isset($this->dataCache['version']))
		{
			return $this->dataCache['version'];
		}

		if (! $this->connID || ( $pgVersion = pg_version($this->connID)) === false)
		{
			$this->initialize();
		}

		return isset($pgVersion['server']) ? $this->dataCache['version'] = $pgVersion['server'] : false;
	}