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Creating Database Most Web applications use database to keep data. Our blog system is not an exception. In this section, we will describe how to write database-driven pages for our blog system. We will use techniques including database access object (DAO) and Active Record. For tutorial purpose, we have simplified the requirements of our blog system so that it only needs to deal with user and post data. We thus create two database tables, users and posts, as shown in the following entity-relationship (ER) diagram.

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