accessing a collection as if it was a DB

I was wondering if it is possible to work with mongoose, using a collection as a database.

The scenario is, i am using a hosting where i can only have a database, but i want to create various sites, that use different databases. so i would have, locally, this:

var dbUrl = 'mongodb://127.0.0.1/database';
mongoose.connect(dbUrl);

and my database, would have a collection for each "db" i wanted to use, for instance:

db.site1;
db.site2;
db.site3;

Then, i would setup mongoose, to treat db.site1 as my main database for this particular site.

Is this possible at all?