As an alternative, for showing content from an RDBMS, I would strongly suggest looking at the slides of Paul Calhoun's session on integrating with RDBMS from XPages. He's presented the session at a variety of LUGs, so they are freely available - here's a link I found immediately http://iamlug.org/iamlug/IamLug2010.nsf/0/4157F9B285855BEC8625770F0053CA57/$FILE/iamlug.xml.jdbc.xpages.calhoun.pdf.

 

This may perform better than redirecting to a servlet and may allow you greater flexibility and functionality.

 

During "Ask The Developers" at Lotusphere earlier this year it was also announced that RDBMS controls for the Extension Library are also being built. I'm not sure of the timescales, but that may also be worth bearing in mind when considering how you implement writing your content - it may make it easier to integrate the controls when they become available.