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[CDO] Exception when removing objects from a list, obtained with query [message #998697]

Thu, 10 January 2013 09:24

Eclipse User

Hello There,

I have a multi-values feature named 'listforA' which has a bunch of objects named A, which I retrieve from a CDO (SQL) query.
next, I do a ...getListForA().removeAll(List<A>) which throws this exception below.

So apparently this is not supported, what would be the appropriate use case to delete objects obtained from a query? Should I create a query which deletes instead?

thx Christophe

java.lang.UnsupportedOperationException
at org.eclipse.emf.internal.cdo.query.CDOQueryResultIteratorImpl$QueryResultList.contains(CDOQueryResultIteratorImpl.java:204)
at org.eclipse.emf.common.util.AbstractEList.getDuplicates(AbstractEList.java:1151)
at org.eclipse.emf.common.notify.impl.DelegatingNotifyingListImpl.removeAll(DelegatingNotifyingListImpl.java:908)
at com.netxforge.netxstudio.data.importer.ResultProcessor.removeValues(ResultProcessor.java:187)

Re: [CDO] Exception when removing objects from a list, obtained with query [message #998755 is a reply to message #998697]

Thu, 10 January 2013 11:21

Eclipse User

My first thought is, where are the items contained? Do you really want to operate with CDOQuery?

But to answer the question (for one item), EcoreUtil.delete(item) should delete an item correctly. (it also checks for cross-references which could be slow)

[Updated on: Thu, 10 January 2013 11:26] by Moderator

Re: [CDO] Exception when removing objects from a list, obtained with query [message #998758 is a reply to message #998755]

Thu, 10 January 2013 11:26

Eclipse User

Thanks Per. Yes I need CDO Query, to reduce the collection of objects based criteria . (In this case a period in time).
I found a solution, but copying the CDO query list result into a new array first, and then remove the bunch from the multi-values feature.
(BTW using DELETE command in a CDO Query is not allowed by the underlying JDBC driver, I get an error:
Can not issue data manipulation statements with executeQuery().)

rgds Christophe

Re: [CDO] Exception when removing objects from a list, obtained with query [message #998798 is a reply to message #998758]

Thu, 10 January 2013 13:03

Eclipse User

I think I am somewhere else Smile

.

I actually only use CDOQuery for fetching elements in order to use these.

Are you cleaning the database from unneeded elements?

Re: [CDO] Exception when removing objects from a list, obtained with query [message #998824 is a reply to message #998798]

Thu, 10 January 2013 14:07

Eclipse User

yes, exaxtly. It's for cleaning up. We deal with a lot of perishable objects Smile

Re: [CDO] Exception when removing objects from a list, obtained with query [message #999016 is a reply to message #998824]

Fri, 11 January 2013 01:39

Eclipse User

Am 10.01.2013 20:07, schrieb Christophe Bouhier:
> yes, exaxtly. It's for cleaning up. We deal with a lot of perishable objects :)
I'm a little confused. Is your question about a problem with deleting CDOObjects or with using CDOQuery results? You're
not trying to call remove() on the list that comes out of CDOQuery.getResult(), are you?

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Re: [CDO] Exception when removing objects from a list, obtained with query [message #999028 is a reply to message #999016]

Fri, 11 January 2013 02:22

Eclipse User

Am 11.01.2013 07:39, schrieb Eike Stepper:
> Am 10.01.2013 20:07, schrieb Christophe Bouhier:
>> yes, exaxtly. It's for cleaning up. We deal with a lot of perishable objects :)
> I'm a little confused. Is your question about a problem with deleting CDOObjects or with using CDOQuery results?
> You're not trying to call remove() on the list that comes out of CDOQuery.getResult(), are you?
So, Ed finally explained to me what you're meaning:

List<A> result = query.getResult();
myObject.getListForA().removeAll(result);

See how easy it can be to explain a problem by pasting some parseable code :P

It seems that some non-optional parts of the list contract have never been implemented by
CDOQueryResultIteratorImpl.QueryResultList<T>. Please submit a bugzilla and I'm sure I can get it to work.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Re: [CDO] Exception when removing objects from a list, obtained with query [message #999058 is a reply to message #999028]

Fri, 11 January 2013 03:40

Eclipse User

I should really abandon this nasty habit, to "explain" code.
If you don't mind, I used your snippet for the bug Smile

https://bugs.eclipse.org/bugs/show_bug.cgi?id=397948

Cheers Christophe

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