> 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.md).

# Active Record 数据库迁移：表/字段

* Migration
* Schema
* Connection Adapters

包括：Schema Statements、Table Definition、Table 和 Database Statements 等。

* 其它

包括：Model Schema\*、Command Recorder、~~Schema Dumper~~ 和 ~~Schema Migration~~.

* ~~Migrator~~
* ~~Schema Dumper~~