On Wednesday I will be introducing the app engine datastore. You use the datastore via the db.Model. This Model is an implementation of an Object Relational Mapping (ORM) which is code that maps a database table to a Class in an object-oriented language. Most modern webapp frameworks implement an ORM: Rails uses ActiveRecord, Java Servlets use Hibernate, Django uses Models, etc., and they all operate in very similar ways.
Below is a video describing the design of the Google datastore and how to use it. The resolution is rather low so I recommend you follow by reading the slides from the talk.
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