Comment by skybrian

3 months ago

It seems like generating the diffs from the schema's version history is equivalent to doing it the opposite way, provided that each diff is tested to make sure the database upgrade works. Not all diffs will correspond to feasible database upgrades, so some patches would have to be rejected.

3 comments

skybrian

bootsmann 3 months ago

Not all migrations are as simple as adding and removing columns.

pounderstanding 3 months ago

Migrations give more control.

    Alter table foo add column bar;
    Update foo set bar=baz;
    Alter table foo modify column bar NOT NULL;

skybrian 3 months ago

True. Perhaps annotating the schema would help for simple things?