code: public static function get(string $alias)
      {
          if (isset(self::$databases[$alias]) === false) {
              throw new DatabaseNotFound('database "' . $alias . '" doesn\'t seem to be registered');
          }
  
          return self::$databases[$alias];
      }
docs: Get a database instance aliased as requested.
  
  @static
  @throws DatabaseNotFound if database isn't registered
  @param  string           $alias requested database alias
  @return Database         instance