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98 lines
3.5 KiB
Plaintext
98 lines
3.5 KiB
Plaintext
==================================
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Integrating with a legacy database
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==================================
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While Django is best suited for developing new applications, it's quite
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possible to integrate it into legacy databases. Django includes a couple of
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utilities to automate as much of this process as possible.
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This document assumes you know the Django basics, as covered in the
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`official tutorial`_.
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.. _official tutorial: http://www.djangoproject.com/documentation/tutorial1/
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Give Django your database parameters
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====================================
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You'll need to tell Django what your database connection parameters are, and
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what the name of the database is. Do that by editing these settings in your
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`settings file`_:
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* `DATABASE_ENGINE`_
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* `DATABASE_USER`_
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* `DATABASE_PASSWORD`_
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* `DATABASE_NAME`_
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* `DATABASE_HOST`_
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* `DATABASE_PORT`_
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.. _settings file: http://www.djangoproject.com/documentation/settings/
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.. _DATABASE_ENGINE: http://www.djangoproject.com/documentation/settings/#database-engine
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.. _DATABASE_USER: http://www.djangoproject.com/documentation/settings/#database-user
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.. _DATABASE_PASSWORD: http://www.djangoproject.com/documentation/settings/#database-password
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.. _DATABASE_NAME: http://www.djangoproject.com/documentation/settings/#database-name
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.. _DATABASE_HOST: http://www.djangoproject.com/documentation/settings/#database-host
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.. _DATABASE_PORT: http://www.djangoproject.com/documentation/settings/#database-port
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Auto-generate the models
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========================
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Django comes with a utility that can create models by introspecting an existing
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database. You can view the output by running this command::
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django-admin.py inspectdb [databasename] --settings=path.to.settings
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...where "[databasename]" is the name of your database.
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Save this as a file by using standard Unix output redirection::
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django-admin.py inspectdb [databasename] --settings=path.to.settings > appname.py
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This feature is meant as a shortcut, not as definitive model generation. See
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the `django-admin.py documentation`_ for more information.
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Once you've cleaned up the model, put the module in the ``models`` directory of
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your app, and add it to your ``INSTALLED_APPS`` setting.
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.. _django-admin.py documentation: http://www.djangoproject.com/documentation/django_admin/
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Install the core Django tables
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==============================
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Next, run the ``django-admin.py init`` command to install Django's core tables
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in your database::
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django-admin.py init --settings=path.to.settings
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This won't work if your database already contains tables that have any of the
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following names:
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* ``sites``
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* ``packages``
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* ``content_types``
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* ``core_sessions``
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* ``auth_permissions``
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* ``auth_groups``
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* ``auth_users``
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* ``auth_messages``
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* ``auth_groups_permissions``
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* ``auth_users_groups``
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* ``auth_users_user_permissions``
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If that's the case, try renaming one of your tables to resolve naming
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conflicts. Currently, there's no way of customizing the names of Django's
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database tables without editing Django's source code itself.
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Install metadata about your app
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===============================
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Django has a couple of database tables that contain metadata about your apps.
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You'll need to execute the SQL output by this command::
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django-admin.py sqlinitialdata [appname] --settings=path.to.settings
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See whether it worked
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=====================
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That's it. Try accessing your data via the Django database API, and try editing
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objects via Django's admin site.
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