如何使用 jena 执行 Sparql 删除查询？

Question

I'm trying to execute a delete query using Jena, but I'm getting an error while executing it. I've tried two ways, but in both cases, I'm getting the same error. I'm using jena 2.7.3 and database virtuoso 6.01.3.

Code 1:

String queryString; // deleteQuery.
Model m = VirtModel.openDatabaseModel(file, connectionURL, username, password); 
UpdateAction.parseExecute(queryString, m);

Code 2:

String queryString; // deleteQuery
Model m = VirtModel.openDatabaseModel(file, connectionURL, username, password); 
GraphStore gs = GraphStoreFactory.create();
gs.setDefaultGraph(m.getGraph());            
UpdateRequest ur = UpdateFactory.create(queryString);            
UpdateAction.execute(ur.getOperations().get(0),gs);

Error:

java.lang.InstantiationError: com.hp.hpl.jena.sparql.engine.binding.BindingMap at virtuoso.jena.driver.VirtuosoQueryEngine$VQueryIterator.extractRow(Unknown Source) at virtuoso.jena.driver.VirtuosoQueryEngine$VQueryIterator.moveForward(Unknown Source) at virtuoso.jena.driver.VirtuosoQueryEngine$VQueryIterator.hasNextBinding(Unknown Source) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:108) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:108) at org.openjena.atlas.data.AbstractDataBag.addAll(AbstractDataBag.java:74) at com.hp.hpl.jena.sparql.modify.UpdateEngineWorker.visit(UpdateEngineWorker.java:348) at com.hp.hpl.jena.sparql.modify.request.UpdateModify.visit(UpdateModify.java:97) at com.hp.hpl.jena.sparql.modify.UpdateEngineMain.execute(UpdateEngineMain.java:40) at com.hp.hpl.jena.sparql.modi fy.UpdateProcessorBase.execute(UpdateProcessorBase.java:56) at com.hp.hpl.jena.update.UpdateAction.execute$(UpdateAction.java:330) at com.hp.hpl.jena.update.UpdateAction.execute(UpdateAction.java:323) at com.hp.hpl.jena.update.UpdateAction.execute(UpdateAction.java:283) at com.hp.hpl.jena.update.UpdateAction.execute(UpdateAction.java:237) at com.tcs.ignite.plc.DAOs.ConceptDAO.deleteConceptByURI(ConceptDAO.java:75) at com.tcs.ignite.plc.utilities.ContextListener.contextInitialized(ContextListener.java:35) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723) at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226) at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPo olExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)

Does anyone know why I'm getting this error?

Answer 1

The comment reference is to OWLIM, not Virtuoso. The cause is the same though - bad mix of versions. You need to find out which version of Jena to use with database virtuoso 6.01.3.

An alternative is to run the Virtuoso database as a server and connect to it over the SPARQL protocol. Then the version of Jena (the SPARQL protocol client) is not tied to the version sync'ed to Virtuoso.

Answer 2

Use the next code for send your query directly to Virtuoso server without using any Jena SPARQL parsers/executors.

String queryString; // deleteQuery
Model m = VirtModel.openDatabaseModel(file, connectionURL, username, password); 
VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(str, m);
vur.exec();