|Maintainer:||Domen Kožar <domenNO@SPAMdev.si>|
|Generated:||October 28, 2011|
Inspired by Ruby on Rails’ migrations, SQLAlchemy Migrate provides a way to deal with database schema changes in SQLAlchemy projects.
Migrate was started as part of Google’s Summer of Code by Evan Rosson, mentored by Jonathan LaCour.
The project was taken over by a small group of volunteers when Evan had no free time for the project. It is now hosted as a Google Code project. During the hosting change the project was renamed to SQLAlchemy Migrate.
Currently, sqlalchemy-migrate supports Python versions from 2.4 to 2.7. SQLAlchemy Migrate 0.7.0 supports SQLAlchemy 0.5.x, 0.6.x and 0.7.x branches.
Version 0.6 breaks backward compatibility, please read changelog for more info.
|Operation / Dialect||sqlite||postgres||mysql||oracle||firebird||mssql|
|ALTER TABLE RENAME TABLE||yes||yes||yes||yes||no||not supported|
|ALTER TABLE RENAME COLUMN||yes (workaround) ||yes||yes||yes||yes||not supported|
|ALTER TABLE ADD COLUMN||yes (workaround) ||yes||yes||yes||yes||not supported|
|ALTER TABLE DROP COLUMN||yes (workaround) ||yes||yes||yes||yes||not supported|
|ALTER TABLE ALTER COLUMN||yes (workaround) ||yes||yes||yes (with limitations) ||yes ||not supported|
|ALTER TABLE ADD CONSTRAINT||partial (workaround) ||yes||yes||yes||yes||not supported|
|ALTER TABLE DROP CONSTRAINT||partial (workaround) ||yes||yes||yes||yes||not supported|
|RENAME INDEX||no||yes||no||yes||yes||not supported|
|||(1, 2, 3, 4, 5) Table is renamed to temporary table, new table is created followed by INSERT statements.|
|||See http://www.sqlite.org/lang_altertable.html for more information. In cases not supported my sqlite, table is renamed to temporary table, new table is created followed by INSERT statements.|
|||You can not change datatype or rename column if table has NOT NULL data, see http://blogs.x2line.com/al/archive/2005/08/30/1231.aspx for more information.|
|||Changing nullable is not supported|
SQLAlchemy Migrate is split into two parts, database schema versioning (migrate.versioning) and database migration management (migrate.changeset). The versioning API is available as the migrate command.