/**
* returns given referential action in uppercase if valid, otherwise throws
* an exception
*
* @throws Doctrine_Exception_Exception if unknown referential action given
* @param string $action foreign key referential action
* @param string foreign key referential action in uppercase
*/
public function getForeignKeyReferentialActionSql($action)
{
$upper = strtoupper($action);
switch ($upper) {
case 'CASCADE':
case 'SET NULL':
case 'NO ACTION':
case 'RESTRICT':
case 'SET DEFAULT':
return $upper;
break;
default:
throw DoctrineException::unknownForeignKeyReferentialAction($upper);
}
}
