thirdparty/google_appengine/lib/django/docs/legacy_databases.txt
author Sverre Rabbelier <srabbelier@gmail.com>
Fri, 23 Jan 2009 21:20:33 +0000 (2009-01-23)
changeset 935 09f47e08f805
parent 109 620f9b141567
permissions -rw-r--r--
Adust the as_table tag to render a pick link if appropriate The templates are adjusted to pass on a 'reference' value, which is the url_name of the view from which the entity should be picked. The as_table (and related) function(s) construct and then pass on this argument and enable takes_contex so that we have access to the context of the enclosing template. We only extract ReferenceProperties that end with '_link_id' since that is how all RP's are currently named. It is not possible to create a field with the same name as the RP, as GAE will try to interpret it's contents as the key of an entity before even calling any function we can override. Patch by: Sverre Rabbelier
==================================
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.