15 Jul
2010
15 Jul
'10
1:06 p.m.
No, we only use Hibernate/JDBC. I don't think it's much of an issue for that
snippet
because you will only ever need to run it once. As far as closing sessions if you
forget about them you could write a wrapper for the session and override finalize()
and have it call close(), this way the garbage collector would close the session if you
forgot about it.
Caleb
Igor Popov wrote:
I'm afraid it is a problem. If I'm not closing
the session explicitly
in my component code, I end up getting pool exhausted exceptions. Some
time ago, before I started migrating to component design, I used to
close the session manually in my plugin, but still was getting the
same exceptions. Maybe my code was buggy, but I would like, if
possible, avoid handling sessions myself. Is it even possible? Does
XWiki use any kind of JTA?
2010/7/15 Caleb James DeLisle <calebdelisle(a)lavabit.com>om>:
Yes, it's closed before you have an
opportunity to get a hold of it.
You could add session.close() to the end of the script.
I don't think it is a problem because after extensive testing of that script
I still only have 5 processes of postgres running.
according to the javadoc, connection.commit() releases the actual connection
to the database. The garbage collector would take care of the rest.
I just made a snippet in codeville.
http://code.xwiki.org/xwiki/bin/view/Snippets/DehiddenifierSnippet
Caleb
Igor Popov wrote:
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Thanks, Caleb! That saved me a lot of time.
I have another question. Maybe I'm not getting the hibernate sessions
idea right, but
how can I get the current hibernate session that XWiki uses? I'm not
eager to open my own session, as
I'll have to make sure that it's closed correctly in the end.
I've tried XWikiHibernateStore.getSession() but it appears to give me
a null value.
2010/7/14 Caleb James DeLisle <calebdelisle(a)lavabit.com>om>:
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If you don't mind declaring a dependency on
xwiki-core, you can
import org.xwiki.context.Execution
import com.xpn.xwiki.XWikiContext
import com.xpn.xwiki.XWiki
import com.xpn.xwiki.store.XWikiHibernateStore
and then use:
@Requirement
Execution ex;
XWikiHibernateStore hib =
ex.getContext().get("xwikicontext").getWiki().getHibernateStore();
and you have XWikiHibernateStore, from that you can get the SessionFactory, open a
session and do whatever.
The API:
http://maven.xwiki.org/site/xwiki-core-parent/xwiki-core/apidocs/com/xpn/xw…
Caleb
Igor Popov wrote:
> Again I have a question. QueryManager class allows to make queries to
> the database, but, for example,
> If I want to store an object in the database, I'll have to use
> something similar to hibernate session's save() method.
> What should I do?
>
> 2010/7/9 Igor Popov <gaurnar(a)gmail.com>om>:
>> Thanks, Alex! Never thought that it could be in the "scripting"
>> section of docs...
>>
>> 2010/7/9 Alex Busenius <alex.busenius(a)xwiki.com>om>:
>>> I guess this will answer your question:
>>>
http://platform.xwiki.org/xwiki/bin/view/DevGuide/QueryGuide#HFromJavacompo…
>>>
>>> On 07/09/2010 06:28 AM, Igor Popov wrote:
>>>> Hi!
>>>>
>>>> I'm new to XWiki (especially to new "Component" design). My
question
>>>> is: can my component/plugin access the database
>>>> the same way XWiki does? I.e. if I write Hibernate mappings for my own
>>>> objects and reference them in XWiki hibernate.cfg.xml,
>>>> how can my plugin/component gain access to Hibernate session object?
>>>>
>>>> Previously I've written a plugin for XWiki and had to connect to
>>>> database separately from XWiki.
>>>> It was not convenient at all and I want to avoid this practice in
>>>> further development.
>>>> Moreover, I had some problems with using connection pool, so I think
>>>> it would be wiser to
>>>> use XWiki database connection.
>>>> _______________________________________________
>>>> users mailing list
>>>> users(a)xwiki.org
>>>> http://lists.xwiki.org/mailman/listinfo/users
>>>>
>>> _______________________________________________
>>> users mailing list
>>> users(a)xwiki.org
>>> http://lists.xwiki.org/mailman/listinfo/users
>>>
> _______________________________________________
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>
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