When you say the original query works in the SPARQL view, how could that
query work in the syntax that you wrote it - it neither would know
?sparqlEndpoint nor ?dataset. As the SPARQL view doesn't have a concept
of pre-bound variables (apart from ?this), it would go through different
code than the ApplyConstruct case that is embedded into a SPARQLMotion
script and previous steps would bind variable values.
Holger
On 2/05/2016 4:27, [email protected] wrote:
Hi Holger,
thank You very much, the workaround worked for me. Just wanted to
mention that the original query works in SPARQL view, so it was
strange for me that it did not work in the sml:ApplyConstruct module
(maybe there are some limitation that i am not aware of).
Best regards,
Peter
On Wednesday, April 27, 2016 at 8:50:16 AM UTC+2, Holger Knublauch wrote:
This work-around may help:
SELECT ?s ?p ?o
WHERE {
{
BIND (IRI(CONCAT(str(?sparqlEndpoint),
"?default-graph-uri=", encode_for_uri(str(?dataset)))) AS ?url) .
}
SERVICE ?url {
?s ?p ?o
}
}
The trick here is to avoid passing the default query graph into
the query, and instead put it into the URL using the SPARQL 1.1
protocol. Note that this approach may not help if you have other
pre-bound variables to pass into the SERVICE request.
Holger
On 27/04/2016 16:38, [email protected] <javascript:> wrote:
Hi,
I am trying to query sparql endpoint with sparql motion module of
type sml:ApplyConstruct, where sml:ApplyConstruct is set to:
CONSTRUCT {
?s ?p ?o .
}
WHERE {
SERVICE ?sparqlEndpoint {
GRAPH ?dataset {
?s ?p ?o .
} .
} .
}
?sparqlEndpoint and ?dataset are pointing to correct urls.
Unfortunately when i run script i get exception :
*
Operation failed. On: Apr 22, 2016 5:52:53 PM Reason:
java.lang.UnsupportedOperationException: Initial bindings not
supported for remote queries, consider using a
ParameterizedSparqlString to prepare a query for remote
execution at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.setInitialBinding(QueryEngineHTTP.java:236)at
org.topbraid.sparql.LockOptimizedQueryExecution.setInitialBinding(LockOptimizedQueryExecution.java:94)
at
org.topbraid.spin.sparqlmotion.modules.SMModuleUtil.applyVarBindings(SMModuleUtil.java:92)at
org.topbraid.spin.sparqlmotion.modules.SMModuleUtil.createQueryExecution(SMModuleUtil.java:192)
at
org.topbraid.spin.sparqlmotion.lib.internal.ApplyConstructModule.applyConstruct(ApplyConstructModule.java:51)at
org.topbraid.spin.sparqlmotion.lib.internal.ApplyConstructModule.createGraph(ApplyConstructModule.java:41)
at
org.topbraid.spin.sparqlmotion.modules.AbstractSMModule.getRDFOutput(AbstractSMModule.java:907)at
org.topbraid.spin.sparqlmotion.engine.impl.ExecutionEngineImpl.executeModule(ExecutionEngineImpl.java:176)
at
org.topbraid.spin.sparqlmotion.engine.impl.ExecutionEngineImpl.execute(ExecutionEngineImpl.java:118)at
org.topbraidcomposer.sparqlmotion.views.console.SPARQLMotionConsole.execute(SPARQLMotionConsole.java:79)
at
org.topbraidcomposer.sparqlmotion.actions.AbstractExecuteSPARQLMotionAction$1.run(AbstractExecuteSPARQLMotionAction.java:142)at
org.topbraidcomposer.core.util.ThreadUtil$1$1.run(ThreadUtil.java:64)
at java.lang.Thread.run(Thread.java:745)
Am I doing something wrong ? Or is there any other module that i
can use to query concrete dataset of sparql endpoint ?
Thanks,
Peter G.
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