By sun on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.0.x
Issue links: 
https://www.drupal.org/node/2176621
Description: 

global $databases has been removed in favor of the preexisting static connection info management methods on the Database class.

Drupal 7

global $databases;
// Check whether we have a default connection.
$has_connection = !empty($databases['default']['default']);

Drupal 8

use Drupal\Core\Database\Database;
$has_connection = (bool) Database::getConnectionInfo('default');

All code should already use the Database connection info methods to dynamically add/rename/remove connections. Additional manual manipulations of global $databases were only needed in edge-case situations — those manipulations can be removed now.

Impacts: 
Module developers