Hi Geert I think that 70% of all changes during development are new columns, new tables. Especially it's hard to make with new CMF columns. And if this problem will be solved, only 30% of problems will remain. Hibernate makes columns adding, not removing or type changing. I've never spent much time for these 2 operations. But now i'm spending much time to understand where should i add my column. You're right about other problems but they're complex and almost non-automized.
Maybe it can be easy to implement some ui for crud objects where user can easy manage columns ? Geert Bevin wrote: > > Hi Maxim, > > I agree that this would be a useful feature. The reason why this > hasn't been implemented yet is that this is only a small part of a > very difficult topic that is schema migration. Once you start going > down this road, people will expect more of it. For example, changing > the data types of your properties, deleting properties, normalizing > or splitting tables, etc etc. This almost becomes impossible to do > 'automatically'. You say that Hibernate supports this, but I've never > really seen it working reliably. When I for example upgrade > Confluence, it's recommended by Atlassian to dump the entire DB and > recreate it from scratch instead of using the schema migration > functionality. > > There are difficult questions that come into play with regards to > what happens with existing data, how to handle complex relations that > rely on other modifications, etc etc. If you couple these with the > fact that many databases don't expose a lot of information through > JDBC meta data, it can become very tricky next to impossible to do > right. > > I personally prefer thinking more along the lines of a schema > migration framework, like what Rails provides. We kind of discussed > this on the list a while ago, but nobody ever got enough time to > implement it until now: > http://www.nabble.com/CRUD-and-Table-Creation-tf1652964.html#a4606148 > > Best regards, > > Geert > > > On 25 Dec 2006, at 17:21, Maxim Grigoriev wrote: > >> >> I've just created this issue >> http://uwyn.com/issues/browse/RIFECRUD-4 >> I think it will be very usefull feature. >> -- >> View this message in context: http://www.nabble.com/Make- >> CreateCrudStructureParticipant-to-update-db-schema- >> tf2879818.html#a8047477 >> Sent from the RIFE - users mailing list archive at Nabble.com. >> >> _______________________________________________ >> Rife-users mailing list >> Rife-users@uwyn.com >> http://lists.uwyn.com/mailman/listinfo/rife-users >> > > -- > Geert Bevin > Uwyn "Use what you need" - http://uwyn.com > RIFE Java application framework - http://rifers.org > Music and words - http://gbevin.com > > > _______________________________________________ > Rife-users mailing list > Rife-users@uwyn.com > http://lists.uwyn.com/mailman/listinfo/rife-users > > -- View this message in context: http://www.nabble.com/Make-CreateCrudStructureParticipant-to-update-db-schema-tf2879818.html#a8052055 Sent from the RIFE - users mailing list archive at Nabble.com. _______________________________________________ Rife-users mailing list Rife-users@uwyn.com http://lists.uwyn.com/mailman/listinfo/rife-users
