Problem with PayPal listener / mysql_real_escape_string: session not logged into the database?

In my controller I have a PayPal IPN listener function which calls the mysql_real_escape_string function.  This causes a warning, I think because the session is not logged onto the database:

 

2012-11-21 14:43:08 Warning: Warning (2): mysql_real_escape_string() [<a href='function.mysql-real-escape-string'>function.mysql-real-escape-string</a>]: Access denied for user 'xyz'@'localhost' (using password: NO) in [/home/f20easy/epdshadow/Controller/SubsController.php, line 291]
Trace:
mysql_real_escape_string - [internal], line ??
SubsController::process_ipn() - APP/Controller/SubsController.php, line 291
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161
[main] - ROOT/public_html/index.php, line 87

I need the connection to log onto the database. How do I do this in my controller?

 

Thanks.

 

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