Creating runtime connection

[nwbr]

Hi,
 
I'm creating a desktop application and I want to hide the database
information(login, password, path, etc) from user. But, if I use .xml
file (repository_database.xml) to define that information my user can
see it. How did I can define the db information in code, or hide that
information from my user? I 've tried to use MetadataManager and
ConnectionRepository but I fail.
 
Thankss