SQL migrations for Golang and PostgreSQL

This package allows you to run migrations on your PostgreSQL database using Golang Postgres client. See example for details.

Example

You need to create database pg_migrations_example before running this example.

> psql -c "CREATE DATABASE pg_migrations_example"
CREATE DATABASE

> go run *.go version
version is 0

> go run *.go
creating table my_table...
adding id column...
seeding my_table...
migrated from version 0 to 3

> go run *.go version
version is 3

> go run *.go reset
truncating my_table...
dropping id column...
dropping table my_table...
migrated from version 3 to 0

> go run *.go
creating table my_table...
adding id column...
seeding my_table...
migrated from version 0 to 3

> go run *.go down
truncating my_table...
migrated from version 3 to 2

> go run *.go version
version is 2

> go run *.go set_version 1
migrated from version 2 to 1

> go run *.go create add email to users
created migration 4_add_email_to_users.go

Transactions

If you'd want to wrap the whole run in a big transaction, which may be the case if you have multi-statement migrations, the code in main.go should be slightly modified:

var oldVersion, newVersion int64

err := db.RunInTransaction(func(tx *pg.Tx) (err error) {
    oldVersion, newVersion, err = migrations.Run(tx, flag.Args()...)
    return
})
if err != nil {
    exitf(err.Error())
}