public function createBinding(String $key, $queryPart, $params=[], $expr='', $with='', $addValue=true)
	{
		if (!array_key_exists($key, $this->bindings)) {
			return false;
		}

		if ($key == 'sql') {
			return $queryPart;
		}

		if ($addValue == true) {
			$this->bindings[$key] = $queryPart;
		}

		return $this->$key($queryPart, $params, $expr, $with, $addValue);
	}