From: Avichal Garg <[address removed]>
Subject: Re: [php-139] Dev Environment: PHP/MySQL version control
To: [address removed]
Date: Wednesday, September 16, 2009, 5:27 PM

The "best" way I've seen it handled is to have code that works with
both the old and new schemas and writes to both. Then if you have to
roll back you can and you don't screw up the database. Clearly there's
a big development overhead to do this

We (at Google) only did this in cases where the risk of losing data
was too high and we needed 100% surity that we could roll back if we
needed...for example in the advertising systems that store critical
click and impression data...in which case the development overhead is
worth it

On 9/16/09, Scott Hildebrand <[address removed]> wrote:
> I think version control systems are pretty exclusive to code. If you're
> working with a certain kind of framework like Symfony, the development
> database is auto-generated from YAML files. So essentially schema is
> getting into version control. However once that goes into production
> you're not replacing the database every time you update code. Code can
> change but schema can't without fucking with data... which would be
> unacceptable in most cases.
>
> --- On Wed, 9/16/09, Alan Puccinelli <[address removed]> wrote:
>
> From: Alan Puccinelli <[address removed]>
> Subject: [php-139] Dev Environment: PHP/MySQL version control
> To: [address removed]
> Date: Wednesday, September 16, 2009, 4:14 PM
>
> Has anyone come across a good method for keeping their source code and
> database schema in sychronized version control so that you can roll back
> code and schema simultaneously if need be?
>
> In particular I would be super stoked if there were something out there like
> springloops (www.springloops.com- web based SVN manager) with a web GUI that
> keeps your DBs in sync and allows you to easily deploy from dev to
> production.
>
>
>
> Is this just wishful thinking or has anyone seen it?
>
> -Alan
>
>
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