[fw-general] Database Migrations - Yes, No, Maybe?

[Phoenix]

Coming to ZF from a Rails background (because I'm much stronger in PHP 
than in Ruby), one of the things that "irks" me is the *apparent* lack 
of a formal database migration system.  In Rails, you create migration 
files, define the structure and/or changes in a DB-neutral context, then 
"run" the migration to have the changes made to your database, be it 
MySQL, Oracle, MSSQL, etc.

Does this functionality exist with Zend Framework at all?  I haven't 
seen any mention of it in tutorials or other information, but since I'm 
new, I figure chances are I'm missing something.  If this doesn't exist, 
is it planned?

Thanks.