.NET 数据库迁移工具包

Question

我目前的宠物项目是一个独立于语言的数据库迁移库(Google Code 上的 Wizardby)。它的灵感来自 ActiveRecord Migrations，但也有一些优点。例如，执行一些基本的“类型推断”，因此您不必指定 FK 列的类型。它也足够聪明，可以仅在“升级”序列的情况下生成“降级”脚本。尽管迁移是用特殊的 DSL 编写的，但该工具主要针对 .NET 项目。它也是独立于数据库平台的。

以下是语法的快速概览:

  migration "Blog" revision => 1:
    type-aliases:
      type-alias N type => String, length => 200, nullable => false, default => ""

    defaults:
      default-primary-key ID type => Int32, nullable => false, identity => true

    version 1:
      add table Author:
        FirstName type => N
        LastName type => N
        EmailAddress type => N, unique => true
        Login type => N, unique => true
        Password type => Binary, length => 64, nullable => true

      add table Tag:
        Name type => N

      add table Blog:
        Name type => N
        Description type => String, nullable => false

      add table BlogPost:
        Title type => N
        Slug type => N
        BlogID references => Blog
        AuthorID references => Author

      add table BlogPostTagJunction primary-key => false:
        BlogPostID references => BlogPost
        TagID references => Tag

    version 2:
      add table BlogPostComment:
        BlogPostID references => BlogPost
        AuthorEmailAddress type => N
        Content type => String, nullable => false

    version 3:
      add table Media:
        TypeID type => Int32
        Name type => N
        MimeType type => N
        Length type => Int32
        BlogPostID nullable => true, references => BlogPost
        BlogPostCommentID nullable => true, references => BlogPostComment

      add table User:
        Login type => String, length => 200, nullable => false
        Password type => Binary, length => 64, nullable => false

        index IX_Login columns => [ID, [Login, desc]], unique => true

    version 4:
        add table Forum:
          Name type => String, length => 200, nullable => false
        add column ModeratorUserID nullable => false, references => User

    version 5:
        remove index IX_Login table => User

    version 6:
        add index IX_Login table => User, columns => [ID, [Login, desc]], unique => true

    version 7:
        BlogAuthorJunction primary-key => false:
            BlogID references => Blog
            AuthorID references => Author

        execute native-sql upgrade-resource => InsertSeedData, downgrade-resource => DeleteSeedData

我知道那里有其他迁移库，但嘿，这是一个宠物项目!

问题是:您对数据库迁移工具包的一般特性有什么期望，以及您对这个特殊的小狗语法有什么看法？

Answer 1

我喜欢这种语法。在您的示例中，您专注于改变结构。但是数据操作呢？

在迁移过程中，我经常需要修改数据(例如添加一些字典数据)。