private function prepare($args)
    {
        $bindings = array();

        // Two parameters (key, value).
        if (count($args) == 2) {
            $bindings[$args[0]] = $args[1];
        }
        // Array of parameters.
        elseif (is_array($args[0])) {
            $bindings = $args[0];
        }

        return $bindings;
    }