[support] Can't change database connection

[Tim Johnson]

I'm attempting to switch my database connection on drupal 7.
Based on http://drupal.org/node/18429
I have written the following module code :
// code :
$dba = array (
    'driver' => 'mysql',
    'database' => 'dolphy_books',
    'host' => 'localhost',
    'username' => 'tim',
    'password' => '******',
    );
// Test the current connnection
$result = Database::getConnectionInfo('default');
drupal_set_message("<b>Connection Info</b>: <pre>" . print_r($result,1) . '</pre>');
// Verify that table 'actions' exists
$result = drupal_get_schema('actions');
drupal_set_message("<b>schema</b>: <pre>" . print_r($result,1) . '</pre>');
// change the connection to the one defined by $dba
Database::addConnectionInfo('db1','default',$dba);
db_set_active('db1');
// Test what should now be the current connection. And the info for
// $dba is returned
$result = Database::getConnectionInfo('db1');
drupal_set_message("<b>Now : Connection Info</b>: <pre>" . print_r($result,1) . '</pre>');
// There is no 'actions' table in the 'dolphy_books' database. The
// following code should generate and error
$result = drupal_get_schema('actions');
drupal_set_message("<b>schema</b>: <pre>" . print_r($result,1) . '</pre>');
// YIKES! We are still seeing the 'actions' table. DB switch failed.
// end code

The diagnostics that I have put in indicate (to the best that I can see) that the
appropriate connection info has been provided.
**BUT** the connection has not been changed! The second call to
`drupal_get_schema' returns the same schema info as before the calls
to addConnectionInfo and db_set_active. In fact, there is no table
named 'actions' in the 'dolphy_books' database.

I could really use some help here. This has got me tearing my hair
out and believe me, I've got little to spare!

thanks
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com