public function getOrderByString($includeText = true)
    {
        $statement = "";

        foreach ($this->orderBy as $orderBy) {
            $statement .= $orderBy['column'] . " " . $orderBy['order'] . ", ";
        }

        $statement = substr($statement, 0, -2);

        if ($includeText && $statement) {
            $statement = "ORDER BY " . $statement;
        }

        return $statement;
    }