zwass / goose

Goose database migration tool - fork of https://bitbucket.org/liamstask/goose

goose

Goose is a database migration tool. Manage your database's evolution by creating incremental SQL files or Go functions.

Goals of this fork

This is a fork of https://bitbucket.org/liamstask/goose with the following changes:

• No config files
• Default goose binary can migrate SQL files only
• We dropped building .go files on-the-fly in favor of the below
• Import github.com/pressly/goose package
  • To run complex Go migrations with your own *sql.DB connection via *sql.Tx transactions
  • The pkg doesn't register any SQL drivers anymore (no panic() driver conflicts with your codebase!)
  • The pkg doesn't have any vendor dependencies anymore

Install

$ go get -u github.com/pressly/goose/cmd/goose

This will install the goose binary to your $GOPATH/bin directory.

Usage

Usage: goose [OPTIONS] DRIVER DBSTRING COMMAND

Examples:
    goose postgres "user=postgres dbname=postgres sslmode=disable" up
    goose mysql "user:password@/dbname" down
    goose sqlite3 ./foo.db status

Options:
  -dir string
    	directory with migration files (default ".")

Commands:
    up         Migrate the DB to the most recent version available
    down       Roll back the version by 1
    redo       Re-run the latest migration
    status     Dump the migration status for the current DB
    dbversion  Print the current version of the database
    create     Creates a blank migration template

create

Create a new Go migration.

$ goose create AddSomeColumns
$ goose: created db/migrations/20130106093224_AddSomeColumns.go

Edit the newly created script to define the behavior of your migration.

You can also create an SQL migration:

$ goose create AddSomeColumns sql
$ goose: created db/migrations/20130106093224_AddSomeColumns.sql

up

Apply all available migrations.

$ goose up
$ goose: migrating db environment 'development', current version: 0, target: 3
$ OK    001_basics.sql
$ OK    002_next.sql
$ OK    003_and_again.go

down

Roll back a single migration from the current version.

$ goose down
$ goose: migrating db environment 'development', current version: 3, target: 2
$ OK    003_and_again.go

redo

Roll back the most recently applied migration, then run it again.

$ goose redo
$ goose: migrating db environment 'development', current version: 3, target: 2
$ OK    003_and_again.go
$ goose: migrating db environment 'development', current version: 2, target: 3
$ OK    003_and_again.go

status

Print the status of all migrations:

$ goose status
$ goose: status for environment 'development'
$   Applied At                  Migration
$   =======================================
$   Sun Jan  6 11:25:03 2013 -- 001_basics.sql
$   Sun Jan  6 11:25:03 2013 -- 002_next.sql
$   Pending                  -- 003_and_again.go

dbversion

Print the current version of the database:

$ goose dbversion
$ goose: dbversion 002

Migrations

goose supports migrations written in SQL or in Go.

SQL Migrations

A sample SQL migration looks like:

-- +goose Up
CREATE TABLE post (
    id int NOT NULL,
    title text,
    body text,
    PRIMARY KEY(id)
);

-- +goose Down
DROP TABLE post;

Notice the annotations in the comments. Any statements following -- +goose Up will be executed as part of a forward migration, and any statements following -- +goose Down will be executed as part of a rollback.

By default, SQL statements are delimited by semicolons - in fact, query statements must end with a semicolon to be properly recognized by goose.

More complex statements (PL/pgSQL) that have semicolons within them must be annotated with -- +goose StatementBegin and -- +goose StatementEnd to be properly recognized. For example:

-- +goose Up
-- +goose StatementBegin
CREATE OR REPLACE FUNCTION histories_partition_creation( DATE, DATE )
returns void AS $$
DECLARE
  create_query text;
BEGIN
  FOR create_query IN SELECT
      'CREATE TABLE IF NOT EXISTS histories_'
      || TO_CHAR( d, 'YYYY_MM' )
      || ' ( CHECK( created_at >= timestamp '''
      || TO_CHAR( d, 'YYYY-MM-DD 00:00:00' )
      || ''' AND created_at < timestamp '''
      || TO_CHAR( d + INTERVAL '1 month', 'YYYY-MM-DD 00:00:00' )
      || ''' ) ) inherits ( histories );'
    FROM generate_series( $1, $2, '1 month' ) AS d
  LOOP
    EXECUTE create_query;
  END LOOP;  -- LOOP END
END;         -- FUNCTION END
$$
language plpgsql;
-- +goose StatementEnd

Go Migrations

Import github.com/pressly/goose from your own project (see example), register migration functions and run goose command (ie. goose.Up(db *sql.DB, dir string)).

A sample Go migration 00002_users_add_email.go file looks like:

package migrations

import (
	"database/sql"

	"github.com/pressly/goose"
)

func init() {
	goose.AddMigration(Up, Down)
}

func Up(tx *sql.Tx) error {
	_, err := tx.Query("ALTER TABLE users ADD COLUMN email text DEFAULT '' NOT NULL;")
	if err != nil {
		return err
	}
	return nil
}

func Down(tx *sql.Tx) error {
	_, err := tx.Query("ALTER TABLE users DROP COLUMN email;")
	if err != nil {
		return err
	}
	return nil
}

License

Licensed under MIT License