Getting Phing's dbdeploy task to automatically rollback on delta error

Question

I am using Phing's dbdeploy task to manage my database schema. This is working fine, as long as there is no errors in the queries of my delta files.

However, if there is an error, dbdeploy will just run the delta files up to the query with the error and then abort. This causes me some frustration, because I have to manually rollback the entry in the changelog table then. If I don't, dbdeploy will assume the migration was successful on a subsequent try, so any retries will do nothing.

So the question is, is there any way to get dbdeploy use transactions or can you suggest any other way to have phing rollback automatically when an error occurs?

Note: I'm not that proficient with Phing, so if this involves writing a custom task, any example code or a url with further information is highly appreciated. Thanks

Answer 1

The "proper" way to do this is a backup before schema change, then rollback in case of error.

You dont say what db you use - but it would wonder me if all schema changes would be supported in transactions. Mos thigh end SQL databases (oracle, db2, sql server) dont do that in all cases for really good reasons. Transacitonal schema changes are REALLY hard and REALLY resouce intensive.

Answer 2

Why not write a series of undo deltas and add a phing task that runs on failure of the other task?

Answer 3

you really should take a look at capistrano. TomTom: you are missing something here: the backup before schema change of course has to be made - but what to do with the NEW data that was inserted meanwhile you were thinking that everything is ok? I do not say, tthat there is a good tool for this problem, but the problem exists in real life.