SchemaBot /

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Automatically manages SQLAlchemy database schema upgrades/downgrades.

Documentation is still being written. See docs/tutorial.txt. If you are using Pylons see docs/schemabot-with-pylons.txt. Also see Notes below and don't forget the unit tests.

Run tests with:


By default, tests are performed against an in-memory sqlite database ('sqlite://').

To run tests against a specific database, set the SCHEMABOT_TEST_DBURI environment variable to the database URI. Some examples:

$ SCHEMABOT_TEST_DBURI=postgres://localhost/test1 nosetests
$ SCHEMABOT_TEST_DBURI=sqlite:///mytest.db nosetests


  • Defining a schema change for version 0 is prohibited. Version 0 is reserved for the initial state of the schema (typically an empty schema). Downgrading to version 0 is always possible, which should take the schema back to the initial state, before any schema changes.
  • Attempting to define schema changes for a version and engine that already have a defined change is prohibited.