private function getUpdateStatement($data)
    {
        $bindings = array();
        $statement = '';

        foreach ($data as $key => $value) {
            if ($value instanceof Raw) {
                $statement .= $this->wrapSanitizer($key) . '=' . $value . ',';
            } else {
                $statement .= $this->wrapSanitizer($key) . '=?,';
                $bindings[] = $value;
            }
        }

        $statement = trim($statement, ',');
        return array($statement, $bindings);
    }