78 lines
2.1 KiB
ReStructuredText
78 lines
2.1 KiB
ReStructuredText
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Other Databases
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===============
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Connecting to "external" (non-app) :term:`databases<database>`
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essentially works the same as for the :term:`app database`.
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WordPress Example
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-----------------
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As a somewhat contrived example, let's say the app needs to query a
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WordPress database directly.
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WuttJamaican only reserves a single config file section for itself,
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which may vary (per :term:`app name`) but by default is ``wutta.db``:
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.. code-block:: ini
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[wutta.db]
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default.url = sqlite://
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But any other config file section is up for grabs. Some other
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packages may effectively reserve other sections, but if we assume
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nobody has yet reserved the ``wordpress.db`` section, might add
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something like:
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.. code-block:: ini
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[wordpress.db]
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default.url = mysql://wutta:wuttapass@localhost/wordpress
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Then in the app code you can load the connection(s) with
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:func:`~wuttjamaican.db.conf.get_engines()`::
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from wuttjamaican.conf import make_config
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from wuttjamaican.db.conf import get_engines
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config = make_config()
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engines = get_engines(config, 'wordpress.db')
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As you might imagine, "rinse and repeat" for other types of databases
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besides WordPress.
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Multiple Databases
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------------------
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As with the app database, you can have multiple databases per type.
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To continue with the previous example, let's say you have a
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"production" WordPress site but also a "staging" site and the app must
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query both.
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There should always be a "default" database chosen, so in this case
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we'll choose "production" for that:
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.. code-block:: ini
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[wordpress.db]
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keys = default, staging
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default.url = mysql://wutta:wuttapass@localhost/wordpress
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staging.url = mysql://wutta:wuttapass@localhost/wordpress_test
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Then in the app code you can reference both a la::
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from sqlalchemy import orm
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from wuttjamaican.conf import make_config
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from wuttjamaican.db.conf import get_engines
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config = make_config()
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engines = get_engines(config, 'wordpress.db')
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Session = orm.sessionmaker()
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Session.configure(bind=engines['default'])
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prod_sess = Session()
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stag_sess = Session(bind=engines['staging'])
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