I have the following [migration](https://guides.rubyonrails.org/active_record_migrations.html) file `db\migrate\20100905201547_create_blocks.rb`

How can I specifically rollback that migration file? 

How to rollback a specific migration?

I added a table that I thought I was going to need, but now no longer plan on using it. How should I remove that table?

I&#39;ve already run migrations, so the table is in my database. I figure `rails generate migration` should be able to handle this, but I haven&#39;t figured out how yet.

I&#39;ve tried:  

    rails generate migration drop_tablename

but that just generated an empty migration.

What is the &quot;official&quot; way to drop a table in Rails?

Rails DB Migration - How To Drop a Table?

I&#39;m using EF 6.0 for my project in C# with manual migrations and updates. I have about 5 migrations on the database, but I realised that the last migration was bad and I don&#39;t want it. I know that I can rollback to a previous migration, but when I add a new (fixed) migration and run Update-Database, even the bad migration is applied.

I was trying to rollback to the previous migration and delete the file with bad migration. But then, when I try to add new migration, I get error when updating database, because the migration file is corrupted (more specifically, first line of code rename the table A to B  and is next lines, EF is trying to update table with name A - maybe it is some EF bug).

Is there some query I can run, which would tell EF something like &quot;Forget last migration like it never existed, it was bad&quot;? Something like Remove-Migration.

**Edit1**
I found solution suited for me. Changing model to the good state and run `Add-Migration TheBadMigration -Force`. This will re-scaffold the last, not applied migration.

Anyway, this still not answer the original question completely. If I UpdateDatabase to the bad migration, I did not found good way how to rollback and create new migration, excluding the bad one. 

Thanks

Entity Framework rollback and remove bad migration

I have an SVN file which is now missing some logic and so I need to go back about 40 revisions to the time when it had the logic I need. Other than trying to view a diff of the file in the command line (*very hard to read*), is there any way I could get a copy of that file to review so I can study it to recover parts?

How do I view an older version of an SVN file?

I&#39;m working in a branch (i.e. `design`) and I&#39;ve made a number of changes, but I need to discard them all and reset it to match the repository version. I thought `git checkout design` would do it, but it just tells me I&#39;m already in branch `design` and that I have 3 modified files.

How would I discard those changes and get the branch as it stands now on the remote server?

How to discard all changes made to a branch?

this might be a trivial question but: Since ADO.NET entity framework automatically tracks changes (in generated entities) and therefore keeps the original values, how can I rollback changes made to the entity objects?

I have a form which allows the user to edit a set of &quot;Customer&quot; entities in a grid view. 

Now I have two buttons &quot;Accept&quot; and &quot;Revert&quot;: if &quot;Accept&quot; is clicked, I call `Context.SaveChanges()` and the changed objects are written back to the database. If &quot;Revert&quot; is clicked, I would like for all objects to get their original property values. What would be the code for that?

Thanks



Undo changes in entity framework entities

Can anyone tell me how to revert (roll back) a checkin in TFS 2010?

How to revert (Roll Back) a checkin in TFS 2010

I&#39;d like to rollback a change I made recently in TFS. In Subversion, this was pretty straightforward.  However, it seems to be an incredible headache in TFS:

### Option 1: Get Prior Version
 1. Manually get prior version of each file
 2. Check out for edit
 3. Fail - the checkout (in VS2008) forces me to get the latest version


### Option 2: Get TFS Power Tools
 1. Download Team Foundation Power Tools
 2. Issue rollback command from cmd line
 3. Fail - it won&#39;t work if there are any other pending changes

### Option 3: Manually Undo Changes

 1. manually undo my changes, then commit a new changeset


### Question
How do I rollback to a previous changeset in TFS?

How do I rollback a TFS check-in?

I&#39;ve got an IDbTransaction in a using statement but I&#39;m unsure if it will be rolled back if an exception is thrown in a using statement. I know that a using statement will enforce the calling of Dispose()...but does anyone know if the same is true for Rollback()?

**Update:** Also, do I need to call Commit() explicitly as I have below or will that also be taken care of by the using statement? 

My code looks sort of like this:

    using Microsoft.Practices.EnterpriseLibrary.Data;
    
    ...
    
    using(IDbConnection connection = DatabaseInstance.CreateConnection())
    {
        connection.Open();
    
        using(IDbTransaction transaction = connection.BeginTransaction())
        {
           //Attempt to do stuff in the database
           //potentially throw an exception
           transaction.Commit();
        }
    }



Will a using statement rollback a database transaction if an error occurs?

I am trying to create an ActiveRecord Object.But I&#39;m getting this error while creating it.

    (0.1ms)  ROLLBACK
    ActiveRecord::StatementInvalid: PG::InFailedSqlTransaction: ERROR:  current transaction is       aborted, commands ignored until end of transaction block

Any ideas folks regarding the issue.

ActiveRecord::StatementInvalid: PG InFailedSqlTransaction

I have a Mercurial repository that I use in local only... It&#39;s for my personal usage (so I don&#39;t &quot;push&quot; anywhere).

I made a commit with 3 files, but after that I understood that I should do commit 4 files...

Is there a way to &quot;rollback&quot; my **last** (latest, only one) commit, and &quot;recommit&quot; it with the correct files?

(I don&#39;t know why, but my &quot;*Amend current revision*&quot; option is not active, so I can&#39;t use it...)

How do you &quot;rollback&quot; last commit on Mercurial?

How can I undo the most recently executed mysql query?

How can I undo a mysql statement that I just executed?

I have a web server that serves a project that is a git repository. When I do some changes to the code I then do a git pull from the server. Sometimes the new code just crashes, I would like to be able to do a rollback to the latest pull, the one just before. I want to do that with a script, without having to search what is the latest sha. How can I do that?

Edit: Just to clarify, I just want to have to do one action, like pushing a button that says &quot;oops! this latest pull I just did was a mistake, I wish I didn&#39;t do that&quot;. I don&#39;t want to have to look for sha or tags or anything else in this situation, it&#39;s more like an &#39;undo&#39; function.
Then I want to be able to continue working on the code and the next pull on the server needs to bring the latest changes.

Git rollback 1 pull

MyBatis migrations splits each SQL file into two sections:

1. One for migrating forward one version
2. One for migrating back one version

How does one roll back versions using [Flyway](http://flywaydb.org)?

How to roll back migrations using Flyway?

I accidentally deleted some huge number of rows from a table...

How can I roll it back?

I executed the query using [PuTTY][1].

I&#39;ll be grateful if any of you can guide me safely out of this...

  [1]: http://en.wikipedia.org/wiki/PuTTY


How can I roll back my last delete command in MySQL?

Is there a quick rake db:rollback command for all of the migrations?

Rake db:migrate - how do I undo all migrations and redo them

What is the difference between the menu items rollback, backout and strip in the Mercurial Eclipse plugin?

Can I delete the commit in the local repository without modify the files in my workspace with one of this 3 commands?

Or is there another solution how I can commit and push a fix on another part of the project? My current work is not finish and I can not push it. But I must checkin a quick fix for another part of the project.

The only solution that I see is to create a second workspace. But this look like a overkill for me.

All Rollback Solutions on Gang of Coders

Total of 17 Rollback Solutions