Thanks, this is a good solution I think. I'll try it.
The final solution I came up with is:
Query query = cloud.createNodeQuery();
query.addStep(cloud.getNodeManager("A"));
query.addRelationStep(cloud.getNodeManager("A"), "related",
"destination");
cloud.getList(query);
This is more or less the same as you suggest and indeed has the
disadvantage that every relation that needs to be obtained results in
another database call. Putting relation numbers in a single constraint
is a good way to solve this.
Regards,
Ronald Wildenberg
> -----Oorspronkelijk bericht-----
> Van: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Namens Rob van Maris
> Verzonden: donderdag 21 oktober 2004 14:22
> Aan: [EMAIL PROTECTED]
> Onderwerp: RE: Fetching relations from the MMBase cloud
>
> My solution:
> NodeIterator iNodes= cloud.getList(null, "A,related,A", null,
> null, null, null, "destination", false).nodeIterator();
>
> Then iterate and retrieve the relation nodes one by one using:
> Node related = iNodes().nextNode().getNodeValue("related");
>
> One problem may be that the second step may result in
> separate queries for each relation that is retrieved.
> This can be overcome by first collecting all the nodenumbers:
> int relatedNumber = iNodes.nextNode.getIntValue("related.number")
>
> Then construct a commaseparated string of these numbers, and
> retrieve all objects A in one go using a constraint like
> "NUMBER in (...)".
>
> Rob van Maris
> Technical Consultant
>
> Quantiq
> xmedia & communication solutions
>
> Koninginneweg 11-13
> 1217 KP Hilversum
>
> T +31 (0)356257211
> M +31 (0)651444006
> E [EMAIL PROTECTED]
> W http://www.quantiq.com
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> On Behalf Of Ronald Wildenberg
> Sent: donderdag 21 oktober 2004 10:18
> To: [EMAIL PROTECTED]
> Subject: Fetching relations from the MMBase cloud
>
>
> Hi,
>
> I have a problem retrieving relations from an MMBase cloud. I
> have the following (simplified) cloud model:
>
> A - related - A
> A - related - B
>
> I wish to retrieve all 'related' relations between A and A.
>
>
>
>
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