Most web applications rely on databases for storing important data. These videos should help you work with various database frameworks and servers.
Couchbase Interview with Chris Anderson
An interview with J. Chris Anderson, one of the founders of Couchbase, a company pioneering the NoSQL movement.
Event Listeners in Doctrine 2
Use Events in Doctrine 2 to handle trivial portions of your domain models.
Many-to-Many with Doctrine 2
Building and testing a many-to-many relationship. This was a bit of a rocky video, but I also include some tips for debugging your Doctrine 2 configuration.
One-to-Many with Doctrine 2
Setup One-to-Many with Doctrine 2 using PHPDoc annotations.