protected function _checkIdentifierColumn($name)
{
$this->_checkIdentifierPart('column', $name, $name);
// also, must not have two or more underscores in a row
if (strpos($name, '__') !== false) {
throw $this->_exception('ERR_IDENTIFIER_UNDERSCORES', array('type' => 'column', 'name' => $name));
}
}