alter multiple mysql databases at once (SAAS database changes)

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We are running a PHP (zend framework) app that creates a database per user (for security/backup/and others reasons).
All these databases have exactly the same structure and that will always be the case. When we deploy new features we’ll need to expand all databases with the new fields/tables.

I’ve read about using dbdeploy for that, but I’m not sure that they support multiple databases at once (without giving in the names one by one). Databases are called user1, user2, user3 and so on.

Are there any good tools that will make this process for us a bit easier and less painful?
We are running phing for automated deployment and found the guide http://www.davedevelopment.co.uk/2008/04/14/how-to-simple-database-migrations-with-phing-and-dbdeploy/ not so useful because they don’t support multiple databases like we have.

Also, windows or mac mysql clients that can do this are possible for us, so we are open for anything

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