just use flywaytest to test my application.
I would like to know if there is a method that, after importing a migration script, I make the rollback.
If I was not clear, just ask information.
thanks
Your question is not very clear but if you would like to rollback a failed migration and retry here are the steps you need to take:
If you look in your schema_version table you should see the script which failed (state column = FAILED). You need to correct this script so it doesn't fail again. Also if some of the script completed successfully you may have to manually revert these changes as running them again may cause a failure.
You then delete this row from the table e.g. delete from schema_version where state = 'FAILED';
Then set the current version back to the script before the one that failed. You do this by setting it's CURRENT_VERSION to 1 e.g. update schema_version set current_version = 1 where version = 1.XX;
You can then attempt to run the flyway migration again.
The flywaydb not support rollback in case of problems during migration the best you can user is:
http://flywaydb.org/documentation/maven/repair.html
But you will have to ensure for yourself the integrity of the data within the database.
If the database you're working to support checkpoints, always advise that before migrating, do the checkpoint.
good luck
the flyway does not support rollback with one-line command,
there's no command like mvn flyway:rollback , there are 2 ways you can do (IMO)
follow the answer from #user528827
try to use the rails's migration :)
This is explained in the FAQ:
https://flywaydb.org/documentation/faq#downgrade
https://flywaydb.org/documentation/faq#rollback
https://flywaydb.org/documentation/faq#repair
Update: Flyway 5.0 now comes with an undo command.
Related
I changed a flyway script for error, and this brought my migrations to an error state (I have 5 script versions, but when I run my app it starts from the 4th, and get an error on 'reaction already exists').
I tried to use clean from flyway cli, but it didn't completely solve the problem... also, when I try pushing my branch to git, CI/CD pipeline will fail for the migration.
Since I'm in development environment, would it be a terrible idea to all delete migration scripts?
Would deleting all scripts allow me to 'start from scratch' in my development environment, or do I need to push the whole project again to avoid issues? (Project is not in production yet, I don't really need flyway migrations)
Depending on which flyway version you are using, one option is to go to the flyway_schema_history or schema_version table and just locate the row (corresponding to the failed script) and change the success column to true or 1. Then manually run the script (the correct one) against DB.
I'm evaluating Flyway and want to know if it can check for the presence of any externally made changes? I.e. if someone makes a change directly to the database, outside of Flyway, can I catch that?
I tried validate and info but it doesn't seem to notice.
No, it can't. Flyway expects you to make all changes to what you want it to manage (structure, reference data, ...) via Flyway.
Here at Redgate we support the concept of a schema snapshot. If you use either SQL Server or Oracle (as these are the database we have best support for) then you can take a snapshot after deployment and later compare this artifact with target database the next time you deploy to make sure that it hasn't "drifted". Our tools can also output a candidate Flyway migration script that will ensure Flyway is consistent with the actual target. If you're interested in this approach I can send you sample scripts of how this is achieved. But remember, this only works with Oracle and SQL Server.
Background
I am running a flyway migration against DB2 using the command line interface. I have done a number of tests and all works fine. I added in some commands to cause a failure.
Question
Can someone confirm if alter table, drop table or create table SHOULD be rolled back if the migration fails and the database supports DDL? When i test it it looks like an alter table add column statement was not rolled back after a failure in the same flyway script.
Ok so i checked the flyway website and found a list of supported drivers and versions where DDL is supported. It seems like the version of DB2 we are using is below this threshold. Based on that i guess the execution of migrate script is not bound in a single transaction and that is why i am seeing some changes remaining that were applied before the script failure.
I am trying flyway for first time, evaluating how it will fit into our project.
Trying to understand how a Failed Scenario will work
Naturally, what i did next was, modified the sql script, and re tried running, but got checksum error
Have three Ques here
So I guess the only way out is ... need to make a 1.2 with correct format or manually modify 'schema_version' table. Right , or am i missing something?
Wondering how will such a scenario work in case if this script is called from continuous integration tools (Jenkins or Bamboo). Manual Intervention will be needed.
Not sure if some other tool like Liquibase will behave in a different (better) manner
In that situation I think you should use "flyway repair" rather the "flyway migrate"
https://flywaydb.org/documentation/command/repair
One thing from your post that is not clear is was the script you ran a single DDL statement or a number of statements, of which one or more failed?. The reason for asking is that flyway records the results of a migration, but does not itself clean up 'script errors'. Depending on the database you are using this could be done by running the DDL statements within a transaction.
Liquibased operates with a much tighter connection to the database as it directly interacts with the DDL that can be expressed in a range of different formats. As such it has a much tighter control over the management of DDL deployment.
Upstream insists on manual rolling back of failed migration and re-applying it again. There is no "skip" command.
But you can manually fix and complete failed migration and manually change "schema_version"."success" to 1.
OUR SYSTEM
We are trying to put migrations as .sql files under version control. Developers would write a VN__*.sql file, commit to version control and a job that runs every 5 minutes would automatically migrate to a Dev and Test database. Once the change proved to not cause problems, someone else would run a manual job to run the migration on Production.
MY PROBLEM:
I had a demo migration that created a few tables. I checked V4__DemoTables.sql into version control on my PC.
On our Linux box a job that runs every 5 minutes extracted the new file from version control, then ran the flyway.sh file. It detected the file and executed it.
But the .sql file had a typo. And we are using Neteeza which has problems with flyway automatically wrapping a migration in a BEGIN TRAN ... END TRAN. So the migration created 2 tables, then aborted before the third.
No problem I thought. I dropped the 2 tables that the .sql file did create. Checked V4__ out of version control, fixed the typo and re-submitted it.
Five minutes later the update was extracted but flyway complains that the checksum does not match. So it will NOT run the updated V4__DemoTables.sql file.
How do I get flyway to accept the updated file and update the checksum in the SCHEMA_VERSION file in case of a typo?
Reading the docs it seems like the developers suggest I should have created a new V4_1_DemoTables.sql file with the fix's. But this would have collided with the commands in the V4__ file so this seemed wrong.
So here is what the docs imply I need to do:
Leave V4__ as a 'successful' migration according to the
SCHEMA_VERSION table.
Create V4_1_ to delete the tables that were created before the typo
line in V4__.
Create V4_2_ which has the typo fix from the original file to do all
the real work.
Is this correct?
If the migration completes successfully, but some of the db objects are not quite right yet (typo in column name, ...), do as you said and push a follow-up script that fixes it (rename column, ...).
If the migration fails, and it didn't run on a DB with DDL transaction, the DB must be cleaned manually. This means:
Reverting the effects of the migration on the DB
Removing the version from the SCHEMA_VERSION table and marking the previous one as current
This second step will be automated in the future with the introduction of the flyway.repair() command.