EF 迁移:回滚上次应用的迁移? [英] EF Migrations: Rollback last applied migration?

问题描述

这看起来是一项非常常见的任务，但我找不到一种简单的方法来完成它.

This looks like a really common task, but I can't find an easy way to do it.

我想撤消上次应用的迁移.我本来希望有一个简单的命令，比如

I want to undo the last applied migration. I would have expected a simple command, like

PM> Update-Database -TargetMigration:"-1"

相反，我能想到的是:

PM> Get-Migrations

Retrieving migrations that have been applied to the target database.
201208012131302_Add-SystemCategory
201207311827468_CategoryIdIsLong
201207232247409_AutomaticMigration
201207211340509_AutomaticMigration
201207200025294_InitialCreate

PM> Update-Database -TargetMigration:"CategoryIdIsLong"

(至少我可以只用名字，跳过时间戳...)

(At least I can use just the name, skipping the timestamp...)

有没有更简单的方法?

推荐答案

从 EF 5.0 开始，您描述的方法是首选方法.所以

As of EF 5.0, the approach you describe is the preferred way. So

PM>Update-Database -TargetMigration:"NameOfSecondToLastMigration"

或使用您的示例迁移

PM>更新数据库 -TargetMigration:"CategoryIdIsLong"

一种解决方案是创建一个自动执行上述步骤的包装器 PS 脚本.此外，请随时为此创建功能请求，或者更好的是，尝试实现它！https://github.com/dotnet/ef6

One solution would be to create a wrapper PS script that automates the steps above. Additionally, feel free to create a feature request for this, or better yet, take a shot at implementing it! https://github.com/dotnet/ef6

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