In the Zend Framework, using Zend_Db_Table as your model class is not well advised. This practice can force you to put business logic in other places besides your model class. This may not be a big deal if your logic is simple but imagine the logic is fairly complicated. Now also imagine that the logic changes at some point. This can be a problem if you have this logic written in many different places.
There's a solution to this problem though. You could write a Model class that uses Zend_Db_Table as a storage medium. Or, you can extend Zend_Db_Table to add your logic to the class. There is a way to simplify this process and that's what this blog post is about.Read More