Connection to database when multiple URLs are defined

Drupal allow connection to multiple databases. To do this the $db_url (in settings.php) variable can be defined as array, not as string as is in a common Drupal installation. When this occur the Drupal database connection string is hold by $db_url['default'] instead of $db_url.

Attached there is a patch to fix this issue for dbscripts.module. The patch it also use the PHP parse_url() function to extract the database settings instead using of preg_match().