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Posted to users@jena.apache.org by Stephan Zednik <ze...@rpi.edu> on 2012/07/12 18:48:20 UTC

Does ARQ list:member work with TDB?

I am transitioning from in-memory models to TDB on a system and all my queries that leverage ARQ's list:member are no longer fully functioning.

specifically, list:member is not longer being asserted and as such members of lists are no longer being described.

My queries take the form:

DESCRIBE ?service ?operation
WHERE { ?service dcterms:identifier ?id .
	OPTIONAL { ?service ex:operations [ list:member ?operation ] }
}

and are run using the following code:

protected Model _describe(JenaObject obj, String query, QuerySolutionMap params) {
	dataset.begin(ReadWrite.READ);
	try {
		QueryExecution qExec = QueryExecutionFactory.create(query, dataset, params);
		try {
			Model m = qExec.execDescribe();
			return m;
		} finally {
			qExec.close();
		}
	} finally {
		dataset.end();
	}
}

Thanks.
--Stephan

Re: Does ARQ list:member work with TDB?

Posted by Andy Seaborne <an...@apache.org>.
On 13/07/12 20:11, Stephan Zednik wrote:
> Thanks.
>
> I updated my TDB installation and my application's jena dependencies
> to jena-arq 2.9.2 and jena-tdb 0.9.2 from 2.9.0-incubating and
> 0.9.0-incubating and that seems to have resolved the issue.

That's my memory going - I remembered it used not to work in some 
versions but I thought it was many versions ago!

	Andy

Re: Does ARQ list:member work with TDB?

Posted by Stephan Zednik <lo...@gmail.com>.
Thanks.

I updated my TDB installation and my application's jena dependencies to jena-arq 2.9.2 and jena-tdb 0.9.2 from 2.9.0-incubating and 0.9.0-incubating and that seems to have resolved the issue.

--Stephan

On Jul 12, 2012, at 4:03 PM, Andy Seaborne wrote:

> On 12/07/12 17:48, Stephan Zednik wrote:
>> I am transitioning from in-memory models to TDB on a system and all my queries that leverage ARQ's list:member are no longer fully functioning.
>> 
>> specifically, list:member is not longer being asserted and as such members of lists are no longer being described.
>> 
>> My queries take the form:
>> 
>> DESCRIBE ?service ?operation
>> WHERE { ?service dcterms:identifier ?id .
>> 	OPTIONAL { ?service ex:operations [ list:member ?operation ] }
>> }
>> 
>> and are run using the following code:
>> 
>> protected Model _describe(JenaObject obj, String query, QuerySolutionMap params) {
>> 	dataset.begin(ReadWrite.READ);
>> 	try {
>> 		QueryExecution qExec = QueryExecutionFactory.create(query, dataset, params);
>> 		try {
>> 			Model m = qExec.execDescribe();
>> 			return m;
>> 		} finally {
>> 			qExec.close();
>> 		}
>> 	} finally {
>> 		dataset.end();
>> 	}
>> }
>> 
>> Thanks.
>> --Stephan
>> 
> 
> 
> Works for me.
> 
> Try this:
> 
> 
> ---- D.ttl
> @prefix : <http://example/> .
> 
> :s :p ( 1 2 ) .
> ---- Q.rq
> PREFIX : <http://example/>
> PREFIX list: <http://jena.hpl.hp.com/ARQ/list#>
> 
> SELECT * { :s :p [ list:member ?x ] }
> 
> 
>  sparql --data D.ttl --query Q.rq
> ==>
> -----
> | x |
> =====
> | 1 |
> | 2 |
> -----
> 
>  mkdir -p DB ; rm -f DB/* ; tdbloader --loc=DB D.ttl
>  tdbquery --loc=DB --file Q.rq7
> ==>
> -----
> | x |
> =====
> | 1 |
> | 2 |
> -----
> 
> 	Andy

Re: Does ARQ list:member work with TDB?

Posted by Andy Seaborne <an...@apache.org>.
On 12/07/12 17:48, Stephan Zednik wrote:
> I am transitioning from in-memory models to TDB on a system and all my queries that leverage ARQ's list:member are no longer fully functioning.
>
> specifically, list:member is not longer being asserted and as such members of lists are no longer being described.
>
> My queries take the form:
>
> DESCRIBE ?service ?operation
> WHERE { ?service dcterms:identifier ?id .
> 	OPTIONAL { ?service ex:operations [ list:member ?operation ] }
> }
>
> and are run using the following code:
>
> protected Model _describe(JenaObject obj, String query, QuerySolutionMap params) {
> 	dataset.begin(ReadWrite.READ);
> 	try {
> 		QueryExecution qExec = QueryExecutionFactory.create(query, dataset, params);
> 		try {
> 			Model m = qExec.execDescribe();
> 			return m;
> 		} finally {
> 			qExec.close();
> 		}
> 	} finally {
> 		dataset.end();
> 	}
> }
>
> Thanks.
> --Stephan
>


Works for me.

Try this:


---- D.ttl
@prefix : <http://example/> .

:s :p ( 1 2 ) .
---- Q.rq
PREFIX : <http://example/>
PREFIX list: <http://jena.hpl.hp.com/ARQ/list#>

SELECT * { :s :p [ list:member ?x ] }


   sparql --data D.ttl --query Q.rq
==>
-----
| x |
=====
| 1 |
| 2 |
-----

   mkdir -p DB ; rm -f DB/* ; tdbloader --loc=DB D.ttl
   tdbquery --loc=DB --file Q.rq7
==>
-----
| x |
=====
| 1 |
| 2 |
-----

	Andy