Yes, of course my system requires that I update the key to implement revert. For example, let's say there are 10 versions of foo #1024: (1024, "1024,1" .. "1025,9"). To revert to version 7 I do:

DELETE FROM Foo WHERE id = "1024" OR id = 1024,9" OR id = "1024,8";
UPDATE Foo SET id = "1024" where id = "1024,7";

[download]

What's wrong here? You say it's "nasty" but I don't see anything particularly bad about it.

The thing is, reversion is an uncommon operation. It can be a little hairy and nothing bad will happen. There will only be one place in the code handling reversion. However, linking between objects in join tables and general querying will happen all over the place. If that requires two columns per table for every join I know we'll have problems.

-sam

In reply to Re: Re: Re: Re: Re: Version Control in Database Applications by samtregar
in thread Version Control in Database Applications by samtregar

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