23 Mar
2007
23 Mar
'07
5:59 a.m.
Vincent,
In a corporate environment XWiki will only be accepted if it conforms to
company standards. Oracle is a big player in corporate data centers so it is
vital that this database is supported. Our temporary XWiki implementation on
MySQL is installed on a local server for now, but this situation is only
tolerated because the use of XWiki is seen as innovation and backed by local
management. Inevitably it has to move to our data center in the future.
Even manual tweaking after installation will deter potential users. So I
think XWiki has to work on Oracle out-of-the-box.
Now I am not an Oracle expert, but I like a good challenge. I will try to
get Oracle working on a test machine and report on the results.
BTW Oracle has a free version of Oracle 10g called Oracle Express Edition.
It has many features of the standard edition (the in-process JVM is missing
though) with some limitations on memory, storage and processor use). The
Windows package comes with a decent installer and it will run on a machine
with 512MB. Ideal for testing...
Regards,
Ronald.
2007/3/20, Vincent Massol <vincent(a)massol.net>et>:
On Mar 20, 2007, at 9:26 AM, Vincent Massol wrote:
On Mar 19, 2007, at 1:55 PM, Ronald Borman wrote:
I've just checked the patch and it looks good. It uses listeners for
handling NULL/Empty string. Not sure what are the pros/cons with a
user type. Anyone knows?
On a minor note we should move the hbm files out of the XWiki core
jar and move them into WEB-INF next to the hibernate.cfg.xml file so
that it can be easily modified. This would allow to keep exactly the
same configuration for all databases and provide a hbm and
hibernate.cfg.xml files for Oracle.
WDYT?
I don't have an Oracle installation at hand. If someone could try the
patch that would be cool.
Thanks
-Vincent
John,
Even if the problems mentioned are solved, there could be more
incompatibilities when using Oracle. The organization I work for has
chosen to install XWiki on MySQL for the time being until a working
version under Oracle in a test environment has a track record.
That won't help you if your company standards dictate using Oracle
though...
For the problem regarding searching clobs I currently don't see a
solution with minimal impact. Oracle has a search engine (Oracle
Text)
but it seems to be an extra (external?) feature. Lucene could be an
option (there is even a XWiki plugin), but implementing this is also
no trivial task.
A collegae of mine suggested living with the knowledge that only the
first 4K of a document is searched (if it works that way...).
Yes that may be a good temporary solution and it's possible that
drivers or hibernate support for Oracle improves over time.
See also http://jira.xwiki.org/jira/browse/XWIKI-838. Might be good
to use this issue to gather feedbacks and ideas on CLOBs. Eric Sun
has provided a patch.
It would be cool if someone could look at the patch, validate that
it works and report back on the issue.
XWiki committers should also look into it.
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Regarding the problem with empty strings there may be a solution.
Hibernate lets you define a UserType and substitute a defined type in
a mapping file with this type. The URL
http://www.hibernate.org/169.html descibes a type that stores empty
strings by escaping or marking an empty string so that the value is
not converted into null.
Ah funny... I just replied to you with this same link :)
If this works, you could at least install and
start up XWiki on
Oracle.
Regards,
Thanks
-Vincent
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