Overview¶

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Migration is a feature that allows you to evolve your database schema over time, REL provides DSL that allows you to write migration in Golang.

Defining Migration¶

Migration package usually located inside your-repo/db/migrations package. It's a standalone package that should not be imported by the rest of your application. Each migration file is named as number_name.go, and each migration file must define a pair of migration and rollback functions: MigrateName and RollbackName. Migrate and rollback function name is the camel cased file name without version.

Note

Sample project that demonstrate this setup can be found at Fs02/go-todo-backend

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Running Migration¶

REL provides CLI that can be used to run your migration, it can be installed using go get or downloaded from release page.

Verify installation:

Migrate to the latest version:

Rollback one migration step:

Configuring Database Connection¶

By default, REL will try to use database connection info that available as environment variable.

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Database connection info can also be specified using command line options: dsn, adapter and driver: