Look into the migrations feature of your ORM of choice:
Propel: http://www.propelorm.org/wiki/Documentation/1.6/Migrations
Doctrine:
http://www.doctrine-project.org/projects/orm/1.2/docs/manual/migrations/en
This will automate the migration process in many common cases, you just have
to run some commands via command line.
Alternatively you can create your own SQL diff:
1. Automated - there are tools to compare two different database schemas
and create an SQL script to help you get from DB schema A to DB schema B.
2. Manually - as you add new columns to the DB just create the SQL for each
of them.
gabriel
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