protected function _quote_identifier_part($part)
{
if ($part === '*') {
return $part;
}
$quote_character = self::$_config[$this->_connection_name]['identifier_quote_character'];
// double up any identifier quotes to escape them
return $quote_character . str_replace($quote_character, $quote_character . $quote_character, $part) . $quote_character;
}