Are you speaking of the Informatica Repository? or a database that is populated using Informatica?
Informatica can work with many types of databases, but it is not a database type of its own. Here, we use Informatica to populate Oracle databases. The same connection that you use to connect to the database in Informatica should allow you to connect using the QlikView script.
I think the easiest would be to export the Repository to XML and then import that into QlikView. It seems like you should be able to export the Repository directly from the Repository Manager, but I can't seem to get it to work for me. I also found some information that suggested you could do the export using the admin console.