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This patch does not remove all occurrences of the words in question. Rather, I went through all of the occurrences of the words listed below, and judged if they a) suggested the reader had some kind of knowledge/experience, and b) if they added anything of value (including tone of voice, etc). I left most of the words alone. I looked at the following words: - simply/simple - easy/easier/easiest - obvious - just - merely - straightforward - ridiculous Thanks to Carlton Gibson for guidance on how to approach this issue, and to Tim Bell for providing the idea. But the enormous lion's share of thanks go to Adam Johnson for his patient and helpful review.
82 lines
2.8 KiB
Plaintext
82 lines
2.8 KiB
Plaintext
=========================================
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Integrating Django 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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:doc:`tutorial </intro/tutorial01>`.
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Once you've got Django set up, you'll follow this general process to integrate
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with an existing database.
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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 the :setting:`DATABASES`
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setting and assigning values to the following keys for the ``'default'``
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connection:
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* :setting:`NAME`
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* :setting:`ENGINE <DATABASE-ENGINE>`
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* :setting:`USER`
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* :setting:`PASSWORD`
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* :setting:`HOST`
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* :setting:`PORT`
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Auto-generate the models
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========================
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.. highlight:: bash
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Django comes with a utility called :djadmin:`inspectdb` that can create models
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by introspecting an existing database. You can view the output by running this
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command::
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$ python manage.py inspectdb
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Save this as a file by using standard Unix output redirection::
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$ python manage.py inspectdb > models.py
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This feature is meant as a shortcut, not as definitive model generation. See the
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:djadmin:`documentation of inspectdb <inspectdb>` for more information.
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Once you've cleaned up your models, name the file ``models.py`` and put it in
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the Python package that holds your app. Then add the app to your
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:setting:`INSTALLED_APPS` setting.
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By default, :djadmin:`inspectdb` creates unmanaged models. That is,
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``managed = False`` in the model's ``Meta`` class tells Django not to manage
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each table's creation, modification, and deletion::
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class Person(models.Model):
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id = models.IntegerField(primary_key=True)
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first_name = models.CharField(max_length=70)
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class Meta:
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managed = False
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db_table = 'CENSUS_PERSONS'
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If you do want to allow Django to manage the table's lifecycle, you'll need to
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change the :attr:`~django.db.models.Options.managed` option above to ``True``
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(or remove it because ``True`` is its default value).
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Install the core Django tables
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==============================
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Next, run the :djadmin:`migrate` command to install any extra needed database
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records such as admin permissions and content types::
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$ python manage.py migrate
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Test and tweak
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==============
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Those are the basic steps -- from here you'll want to tweak the models Django
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generated until they work the way you'd like. Try accessing your data via the
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Django database API, and try editing objects via Django's admin site, and edit
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the models file accordingly.
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