Migrations and legacy database

I'm developing a first rails application whith a legacy oracle database. I only have access to the datbase at work, but I would still like to work from home too.

I need to maintain 2 different "migration environments" in the same migration files.

1) At work, I don't use the up or down methods in my migrations classes. 2) At home I would like to "build a copy" of the oracle database" with migrations and mySQL.

How can I accomplish this? Thanks in advance for suggestions and help.