So I\'ve done a bunch of Doctrine2 migrations (https://github.com/doctrine/migrations) but I have a question for a new migration I\'m trying to do.
I\'ve been digging in
You can use the $connection
like this
$result = $this->connection->fetchAssoc('SELECT id, name FROM table1 WHERE id = 1');
$this->abortIf(!$result, 'row with id not found');
$this->abortIf($result['name'] != 'jo', 'id 1 is not jo');
// etc..
You should only read the database and not use the connection to make update/delete so it won't break the dry-run option.
In your example, you should do two migrations. The first will do the two alter table. The second will do the "images with a scrape and convert the scrape to an enclosure" routine. Using multiple migration is easier to revert them if something goes wrong.