Problems and Solution of Caching on View Layer

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When using caching system on view layer, there are problems around context data which are required only when updating cache. For example, a lot of useless DB access, MVC violation, and so on. In this presentation, I describes these problems and proposes simple but useful solution.

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@books is necessary only when
updating cache, but prepared everytime

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（扱ってるPythonのバージョンが2.5と古すぎるせいで、益より害のほうが大きくなったため、公開を終了します。ご精読ありがとうございました。） --- PHPユーザのためのPython入門です。PHPのコードとPythonのコードを並べて書いてるので、PHPユーザにとっては学習しやすいと思います。なお昔の資料なので、Pythonのバージョンが2.5であることに注意。

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