mirror of https://github.com/status-im/migrate.git
102 lines
2.8 KiB
Markdown
102 lines
2.8 KiB
Markdown
# migrate
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[](https://travis-ci.org/mattes/migrate)
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[](https://godoc.org/github.com/mattes/migrate)
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migrate is a migration helper written in Go. Use it in your existing Golang code
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or run migration commands via the CLI.
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```
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Go Code import github.com/mattes/migrate/migrate
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CLI go get github.com/mattes/migrate
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```
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## Available Drivers
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* [PostgreSQL](https://github.com/mattes/migrate/tree/master/driver/postgres)
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* Bash (planned)
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Need another driver? Just implement the [Driver interface](http://godoc.org/github.com/mattes/migrate/driver#Driver) and open a PR.
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## Usage from Terminal
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```bash
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# install
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go get github.com/mattes/migrate
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# create new migration file in path
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migrate -url driver://url -path ./migrations create migration_file_xyz
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# apply all available migrations
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migrate -url driver://url -path ./migrations up
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# roll back all migrations
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migrate -url driver://url -path ./migrations down
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# roll back the most recently applied migration, then run it again.
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migrate -url driver://url -path ./migrations redo
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# run down and then up command
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migrate -url driver://url -path ./migrations reset
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# show the current migration version
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migrate -url driver://url -path ./migrations version
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# apply the next n migrations
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migrate -url driver://url -path ./migrations migrate +1
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migrate -url driver://url -path ./migrations migrate +2
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migrate -url driver://url -path ./migrations migrate +n
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# roll back the previous n migrations
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migrate -url driver://url -path ./migrations migrate -1
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migrate -url driver://url -path ./migrations migrate -2
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migrate -url driver://url -path ./migrations migrate -n
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```
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## Usage in Go
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See GoDoc here: http://godoc.org/github.com/mattes/migrate/migrate
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```go
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import "github.com/mattes/migrate/migrate"
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// use synchronous versions of migration functions ...
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allErrors, ok := migrate.UpSync("driver://url", "./path")
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if !ok {
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fmt.Println("Oh no ...")
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// do sth with allErrors slice
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}
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// use the asynchronous version of migration functions ...
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pipe := migrate.NewPipe()
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go migrate.Up(pipe, "driver://url", "./path")
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// pipe is basically just a channel
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// write your own channel listener. see writePipe() in main.go as an example.
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```
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## Migration files
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The format of migration files looks like this:
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```
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001_initial_plan_to_do_sth.up.sql # up migration instructions
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001_initial_plan_to_do_sth.down.sql # down migration instructions
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002_xxx.up.sql
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002_xxx.down.sql
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...
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```
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Why two files? This way you could still do sth like
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``psql -f ./db/migrations/001_initial_plan_to_do_sth.up.sql`` and there is no
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need for any custom markup language to divide up and down migrations.
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## Credits
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* https://bitbucket.org/liamstask/goose
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