On DZone.com today there's a new post from Krzysztof Kotowicz sharing a presentation of his about protecting your application from SQL injection.

The materials teach how to use prepared statements, how to escape and write secure stored procedures. Many PHP projects are covered - PDO, Propel, Doctrine, Zend Framework and MDB2. Multiple gotchas and caveats are included. I discuss why escaping is usually the wrong choice, which practices to avoid or follow and how stored procedures sometimes offer no protection at all.

The presentation (as posted to Slideshare) starts with some of the basics - what SQL injection is and an example of how it could be used to bypass security. He covers how to use prepared statements in each of the technologies (with code snippets), methods for escaping data and how to create stored procedures that are protected from the same threats.