thirdparty/google_appengine/lib/django/docs/legacy_databases.txt
author Todd Larsen <tlarsen@google.com>
Wed, 21 Jan 2009 00:27:39 +0000
changeset 858 e79e7a22326f
parent 109 620f9b141567
permissions -rw-r--r--
Add an export() view, and implement it as text/text for Document. For every Model except Document, the public() view is displayed for any attempts to access the export() view. Currently, the permissions for export() are the same as for public(). This seems reasonable for Document, since anyone could extract the raw HTML from the page source anyway. The permissions should probably be different for other types of exports, such as vCard or iCard exports of profiles, CSV exports of lists, etc. Patch by: Todd Larsen Review by: to-be-reviewed

==================================
Integrating with a legacy database
==================================

While Django is best suited for developing new applications, it's quite
possible to integrate it into legacy databases. Django includes a couple of
utilities to automate as much of this process as possible.

This document assumes you know the Django basics, as covered in the
`official tutorial`_.

.. _official tutorial: ../tutorial1/

Give Django your database parameters
====================================

You'll need to tell Django what your database connection parameters are, and
what the name of the database is. Do that by editing these settings in your
`settings file`_:

    * `DATABASE_NAME`
    * `DATABASE_ENGINE`_
    * `DATABASE_USER`_
    * `DATABASE_PASSWORD`_
    * `DATABASE_HOST`_
    * `DATABASE_PORT`_

.. _settings file: ../settings/
.. _DATABASE_NAME: ../settings/#database-name
.. _DATABASE_ENGINE: ../settings/#database-engine
.. _DATABASE_USER: ../settings/#database-user
.. _DATABASE_PASSWORD: ../settings/#database-password
.. _DATABASE_HOST: ../settings/#database-host
.. _DATABASE_PORT: ../settings/#database-port

Auto-generate the models
========================

Django comes with a utility that can create models by introspecting an existing
database. You can view the output by running this command::

    django-admin.py inspectdb --settings=path.to.settings

Save this as a file by using standard Unix output redirection::

    django-admin.py inspectdb --settings=path.to.settings > models.py

This feature is meant as a shortcut, not as definitive model generation. See
the `django-admin.py documentation`_ for more information.

Once you've cleaned up your models, name the file ``models.py`` and put it in
the Python package that holds your app. Then add the app to your
``INSTALLED_APPS`` setting.

.. _django-admin.py documentation: ../django_admin/

Install the core Django tables
==============================

Next, run the ``manage.py syncdb`` command to install any extra needed database
records such as admin permissions and content types::

    django-admin.py init --settings=path.to.settings

See whether it worked
=====================

That's it. Try accessing your data via the Django database API, and try editing
objects via Django's admin site.