EF迁移:回滚最后应用迁移?

这看起来是一个非常普通的任务，但我找不到一个简单的方法来做。

我想撤消上一次应用的迁移。我本以为会有个简单的命令，比如

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

相反，我能想到的只有:

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"

(至少我可以只使用名称，跳过时间戳…)

有没有更简单的方法?

当前回答

在EntityFrameworkCore:

Update-Database 20161012160749_AddedOrderToCourse

其中20161012160749_AddedOrderToCourse是您想要回滚到的迁移名称。

2016-10-13 12:25:00

其他回答

解决方案是:

Update-Database –TargetMigration 201609261919239_yourLastMigrationSucess

2016-09-27 23:40:27

在EntityFrameworkCore:

Update-Database 20161012160749_AddedOrderToCourse

其中20161012160749_AddedOrderToCourse是您想要回滚到的迁移名称。

2016-10-13 12:25:00

我想对这个帖子做一些澄清:

Update-Database -TargetMigration:"name_of_migration"

上面所做的就是回滚所有的迁移，直到剩下指定的迁移为止。因此，如果你使用get - migrations，你发现你有A, B, C, D和E，那么使用这个命令将回滚E和D，让你到C:

Update-Database -TargetMigration:"C"

此外，除非有人有相反的意见，否则我注意到您可以使用序数值和短的-Target开关(因此，-Target与-TargetMigration相同)。如果你想要回滚所有的迁移并重新开始，你可以使用:

Update-Database -Target:0

0, above, would rollback even the FIRST migration (this is a destructive command--be sure you know what you're doing before you use it!)--something you cannot do if you use the syntax above that requires the name of the target migration (the name of the 0th migration doesn't exist before a migration is applied!). So in that case, you have to use the 0 (ordinal) value. Likewise, if you have applied migrations A, B, C, D, and E (in that order), then the ordinal 1 should refer to A, ordinal 2 should refer to B, and so on. So to rollback to B you could use either: