Quotes a single identifier (no dot chain separation).

        :param string: The identifier name to be quoted.
        :type string: str

        :return: The quoted identifier string.
        :rtype: str

def quote_single_identifier(self, string):
        """
        Quotes a single identifier (no dot chain separation).

        :param string: The identifier name to be quoted.
        :type string: str

        :return: The quoted identifier string.
        :rtype: str
        """
        c = self.get_identifier_quote_character()

        return "%s%s%s" % (c, string.replace(c, c + c), c)