.. _broker-sqlalchemy: ================== Using SQLAlchemy ================== .. admonition:: Experimental Status The SQLAlchemy transport is unstable in many areas and there are several issues open. Sadly we don't have the resources or funds required to improve the situation, so we're looking for contributors and partners willing to help. .. _broker-sqlalchemy-installation: Installation ============ .. _broker-sqlalchemy-configuration: Configuration ============= Celery needs to know the location of your database, which should be the usual SQLAlchemy connection string, but with 'sqla+' prepended to it:: BROKER_URL = 'sqla+sqlite:///celerydb.sqlite' This transport uses only the :setting:`BROKER_URL` setting, which have to be an SQLAlchemy database URI. Please see `SQLAlchemy: Supported Databases`_ for a table of supported databases. Here's a list of examples using a selection of other `SQLAlchemy Connection String`_'s: .. code-block:: python # sqlite (filename) BROKER_URL = 'sqla+sqlite:///celerydb.sqlite' # mysql BROKER_URL = 'sqla+mysql://scott:tiger@localhost/foo' # postgresql BROKER_URL = 'sqla+postgresql://scott:tiger@localhost/mydatabase' # oracle BROKER_URL = 'sqla+oracle://scott:tiger@127.0.0.1:1521/sidname' .. _`SQLAlchemy: Supported Databases`: http://www.sqlalchemy.org/docs/core/engines.html#supported-databases .. _`SQLAlchemy Connection String`: http://www.sqlalchemy.org/docs/core/engines.html#database-urls .. _sqlalchemy-results-configuration: Results ------- To store results in the database as well, you should configure the result backend. See :ref:`conf-database-result-backend`. .. _broker-sqlalchemy-limitations: Limitations =========== The SQLAlchemy database transport does not currently support: * Remote control commands (:program:`celery events` command, broadcast) * Events, including the Django Admin monitor. * Using more than a few workers (can lead to messages being executed multiple times).