[plt-scheme] schemeql query strings?

When working with databases, I tend to use a connection string, rather than 
a system dsn, and I have tried to do the same thing with schemql.

I haven't had any luck so far, but maybe I am missing something.
Is it possible? And are there any tricks to get it working?

thanks,

rohan

P.S. really enjoying working with it, and want to expand what I use it for,
hence
the question.:)