[Zope] ZPT + ZSQL?

Probably a newbie question, but couldn't find the answer on zope.org... I'd like to use ZPT with data in a relational db. ZSQL methods use dtml vars, so I'm wondering: . Is ZSQL the only/recommended method for ZPT access to a relational DB? . Any tutorials/references, etc. that cover use of the two together? Thanks, Scott.