EF Migrations: Rollback last applied migration?

In EntityFrameworkCore:

Update-Database 20161012160749_AddedOrderToCourse

where 20161012160749_AddedOrderToCourse is a name of migration you want to rollback to.

I realised there aren't any good solutions utilizing the CLI dotnet command so here's one:

dotnet ef migrations list
dotnet ef database update NameOfYourMigration

In the place of NameOfYourMigration enter the name of the migration you want to revert to.

Then you can remove all the reverted migrations for good using

dotnet ef migrations remove

The solution is:

Update-Database –TargetMigration 201609261919239_yourLastMigrationSucess

EF CORE

PM> Update-Database yourMigrationName

(reverts the migration)

PM> Update-Database

worked for me

in this case the original question (yourMigrationName = CategoryIdIsLong)

In EF Core you can enter the command Remove-Migration in the package manager console after you've added your erroneous migration.

The console suggests you do so if your migration could involve a loss of data:

An operation was scaffolded that may result in the loss of data. Please review the migration for accuracy. To undo this action, use Remove-Migration.

update-database 0

Warning: This will roll back ALL migrations in EFCore! Please use with care :)

Additional reminder:

If you have multiple configuration type, you need to specify the [ConfigurationName]

Update-Database -Configurationtypename [ConfigurationName] -TargetMigration [MigrationName]

I run mine through my (BASH GIT) console also running Entity Framework Core. Update-Database commands will not work outside of the package console and I have to use the donet ef commands.

donet ef database update [Name of previous Migration]

This will run the protected override void Down(MigrationBuilder migrationBuilder) method of your current migration and all of the others to get back to the version of the DB you set it to.

I also use the -p [migration project] -s [Project Solution]. This also allows it to point to my appsettings.[Enviorment].json where my password to access DB is stored.

export ASPNETCORE_ENVIRONMENT=[ENVIORMENT]; donet ef database update [Name of previous Migration] -p [Migration Project Name] -s [Solution Name]

A lot of this might be known but wanted to give detail in case your first time doing.

I'm using EntityFrameworkCore and I use the answer by @MaciejLisCK. If you have multiple DB contexts you will also need to specify the context by adding the context parameter e.g. :

Update-Database 201207211340509_MyMigration -context myDBcontext

(where 201207211340509_MyMigration is the migration you want to roll back to, and myDBcontext is the name of your DB context)

Update-Database –TargetMigration:"Your migration name"

For this problem I suggest this link:

https://elegantcode.com/2012/04/12/entity-framework-migrations-tips/

I found that this works when run in the Package Manager Console:

dotnet ef migrations list | select -Last 2 | select -First 1 | ForEach-Object { Update-Database -Migration $_ }

You could create a script that makes it easier.

EF CORE

Update database to the previous point

update-database CategoryIdIsLong

And then, remove the bad migration

remove-migration

In case there is a possibility for dataloss EF does not complete the update-database command since AutomaticMigrationDataLossAllowed = false by default, and roolbacks the action unless you run it with the -force parameter.

Update-Database –TargetMigration:"Your migration name" -force

or

Update-Database –TargetMigration:Your_Migration_Index -force