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From Trygve Laugstøl <tryg...@apache.org>
Subject Re: DB schema migration
Date Wed, 25 Apr 2007 08:26:14 GMT
Stephane Nicoll wrote:
> Can I be sure at least that the DB model won't change as from alpha-1?
> If so I can maybe drop completely my database and recreate my
> projects.

We've been over this before, but I'll repeat: Alphas give no guarantee 
of API (including DB) stability. Hopefully it won't change too much, but 
it should in no way stop the developers from breaking stuff. The 
database is in particular something that can, and most likely will 
change in one form or another. The only thing that's supposed to be 
stable in Continuum are the remote interfaces (socket and xml-rpc stuff) 
and the internal notification APIs.

What is important here is the ability to dump the database to an 
external DB file (xml would be a natural choice) which can be read by a 
newer Continuum.

Hopefully 1.1 will be pretty stable so it can be released ASAP and bugs 
can be fixed on a 1.1.x branch.

--
Trygve

> 
> Thanks,
> Stéphane
> 
> On 4/23/07, Brett Porter <brett@apache.org> wrote:
>> This was one of the things I was going to try and have done before
>> alpha-1 - I just forgot.
>>
>> Erik - the problem in upgrading is the changes in private tables
>> between versions of jpox that we hadn't given explicit names to. We'd
>> probably appreciate most help in future proofing our jpox use a bit
>> more in case it's internal schema changes again.
>>
>> I already have the tools to do an xml export of the old tables, it
>> just needs to somehow be set to run in dump mode using the old jpox,
>> and import using the new one. I'll look at that during ApacheCon, I
>> think. If anyone else wants to take the task while I'm on holidays,
>> let me know... we should also make the tool work with 1.0.3 databases
>> if possible.
>>
>> This is definitely one for the release notes, btw. alpha-1 will not
>> work with 1.0.3 (or earlier 1.1 snapshot) databases.
>>
>> - Brett
>>
>> On 22/04/2007, at 2:10 PM, Erik Bengtson wrote:
>>
>> > If you guys need some tooling from JPOX, let me know and I could
>> > plan to
>> > implement some kind of "export" to XML, and "import" from XML. In
>> > between
>> > export/import you could apply Xqueries to transform data to match
>> > the new
>> > schema
>> >
>> > Quoting Stephane Nicoll <stephane.nicoll@gmail.com>:
>> >
>> >> Hi,
>> >>
>> >> I'm currently running a 1.1-SNAPSHOT from February which runs ok
>> >> except a few minor issues. I'd like to upgrade to 1.1 alpha 1 as soon
>> >> as it's out to provide feedback & co.
>> >>
>> >> Last time I tried to upgrade, I had to revert because the model
>> >> schema
>> >> has changed and it was really difficult to update my existing
>> >> data. Is
>> >> there something scheduled for alpha1 regarding this (at least a
>> >> manual
>> >> procedure to upgrade my schema if necessary).
>> >>
>> >> Thanks,
>> >> Stéphane
>> >>
>> >
>> >
>>


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