Entry tags:

design, errors, security, sql

This is a good cover of common programming (or program design) mistakes that can cause security problems: http://www.smashingmagazine.com/2010/01/14/web-security-primer-are-you-part-of-the-problem/ (it uses PHP in its examples, but you should be able to get the gist of it even if you're not familiar with the language)