3.9 KiB

Raw Blame History

migrate

A migration helper written in Go. Use it in your existing Golang code or run commands via the CLI.

GoCode   import github.com/mattes/migrate/migrate
CLI      go get -u github.com/mattes/migrate

Features

Super easy to implement Driver interface.
Gracefully quit running migrations on ^C.
No magic search paths routines, no hard-coded config files.
CLI is build on top of the migrate package.

Available Drivers

Need another driver? Just implement the Driver interface and open a PR.

Usage from Terminal

# install
go get github.com/mattes/migrate

# create new migration file in path
migrate -url driver://url -path ./migrations create migration_file_xyz

# apply all available migrations
migrate -url driver://url -path ./migrations up

# roll back all migrations
migrate -url driver://url -path ./migrations down

# roll back the most recently applied migration, then run it again.
migrate -url driver://url -path ./migrations redo

# run down and then up command
migrate -url driver://url -path ./migrations reset

# show the current migration version
migrate -url driver://url -path ./migrations version

# apply the next n migrations
migrate -url driver://url -path ./migrations migrate +1
migrate -url driver://url -path ./migrations migrate +2
migrate -url driver://url -path ./migrations migrate +n

# roll back the previous n migrations
migrate -url driver://url -path ./migrations migrate -1
migrate -url driver://url -path ./migrations migrate -2
migrate -url driver://url -path ./migrations migrate -n

# go to specific migration
migrate -url driver://url -path ./migrations goto 1
migrate -url driver://url -path ./migrations goto 10
migrate -url driver://url -path ./migrations goto v

Usage in Go

See GoDoc here: http://godoc.org/github.com/mattes/migrate/migrate

import "github.com/mattes/migrate/migrate"

// Import any required drivers so that they are registered and available
import _ "github.com/mattes/migrate/drivers/mysql"

// use synchronous versions of migration functions ...
allErrors, ok := migrate.UpSync("driver://url", "./path")
if !ok {
  fmt.Println("Oh no ...")
  // do sth with allErrors slice
}

// use the asynchronous version of migration functions ...
pipe := migrate.NewPipe()
go migrate.Up(pipe, "driver://url", "./path")
// pipe is basically just a channel
// write your own channel listener. see writePipe() in main.go as an example.

Migration files

The format of migration files looks like this:

001_initial_plan_to_do_sth.up.sql     # up migration instructions
001_initial_plan_to_do_sth.down.sql   # down migration instructions
002_xxx.up.sql
002_xxx.down.sql
...

Why two files? This way you could still do sth like psql -f ./db/migrations/001_initial_plan_to_do_sth.up.sql and there is no need for any custom markup language to divide up and down migrations. Please note that the filename extension depends on the driver.

3.9 KiB Raw Blame History