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.
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Geert Bevin
Uwyn "Use what you need" - http://uwyn.com
RIFE Java application framework - http://rifers.org
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