> For the complete documentation index, see [llms.txt](https://kelby.gitbook.io/rails-beginner-s-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kelby.gitbook.io/rails-beginner-s-guide/activerecord_migration/activerecord_migration_readme/migration_rollback.md).

# 控制台里迁移、回滚等命令

主要命令

```
rake db:migrate
rake db:rollback

rake db:migrate:up
rake db:migrate:down

rake db:migrate:redo
```

指定版本号的回滚

```
rake db:migrate:down VERSION=20141119130134
```

回滚最近几个迁移

```
rake db:rollback STEP=n
```

n 代表个数。注意：是最近几个，它们会被一起移除。

其它类似命令：

只执行指定版本号的迁移

```
rake db:migrate VERSION=20141119130134
```

只执行最近几次迁移

```
rake db:migrate STEP=n
```

回滚、然后重新执行最近几次迁移

```
rake db:migrate:redo STEP=n
```