Stability Note

Warning: this package is no longer actively maintained, and unfortunately I do not have plans to resume maintenance. This package is very old; in fact, it's the first Haskell package I published, and it shows in many ways. I also don't use it nowadays, which doesn't help when it comes to maintenance. If you are using this library in production, just keep this in mind and I encourage you to consider alternatives. If you would like to take over maintenance, please consider forking this and letting me know at cygnus AT foobox DOT com so I can update the Hackage deprecation status in favor of your new package.

dbmigrations

This package contains a library for the creation, management, and installation of schema updates (called "migrations") for a relational database. In particular, this package lets the migration author express explicit dependencies between migrations. This library is accompanied by a number database-specific packages that contain the management tools to automatically install or revert migrations accordingly.

This package operates on two logical entities:

The "backend": the relational database whose schema you want to manage.
The "migration store": the collection of schema changes you want to apply to the database. These migrations are expressed using plain text files collected together in a single directory, although the library is general enough to permit easy implementation of other storage representations for migrations.

Getting started

To get started, install the right database-specific dbmigrations package for your database. Current options are:

dbmigrations-postgresql
dbmigrations-mysql
dbmigrations-sqlite

Each package provides a variant of the "moo" management program ("moo-postgresql", "moo-mysql", and "moo-sqlite" respectively) to be used to manage your database schema. See MOO.TXT for details on how to use these tools to manage your database migrations.

Submitting patches

I'll gladly consider accepting patches to this package; please do not hesitate to submit GitHub pull requests. I'll be more likely to accept a patch if you can follow these guidelines where appropriate:

Keep patches small; a single patch should make a single logical change with minimal scope.
If possible, include tests with your patch.
If possible, include haddock with your patch.

License

jtdaugherty/dbmigrations

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