Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

convert sparql query results into string array

Posted on 2011-02-21
9
Medium Priority
?
1,525 Views
Last Modified: 2012-05-11
I am trying to convert my sparql query results into string but i get some weird errors

WARN [main] (Log.java:63) - StAX error: End of document while processing solution
Exception in thread "main" com.hp.hpl.jena.sparql.resultset.ResultSetException: End of document while processing solution
      at com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.staxError(XMLInputStAX.java:504)
      at com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.getOneSolution(XMLInputStAX.java:412)
      at com.hp.hpl.jena.sparql.resultset.XMLInputStAX$ResultSetStAX.hasNext(XMLInputStAX.java:216)
      at com.hp.hpl.jena.sparql.resultset.ResultSetMem.<init>(ResultSetMem.java:82)
      at com.hp.hpl.jena.sparql.resultset.TextOutput.write(TextOutput.java:133)
      at com.hp.hpl.jena.sparql.resultset.TextOutput.write(TextOutput.java:116)
      at com.hp.hpl.jena.sparql.resultset.TextOutput.write(TextOutput.java:104)
      at com.hp.hpl.jena.sparql.resultset.TextOutput.format(TextOutput.java:51)
      at com.hp.hpl.jena.query.ResultSetFormatter.out(ResultSetFormatter.java:109)
      at query4.longplace(query4.java:281)
      at query4.main(query4.java:81)
My code is
	final String queryString2 = 
			"PREFIX foaf: <http://xmlns.com/foaf/0.1/>"+
			"PREFIX dbp: <http://dbpedia.org/property/>"+
			"PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>"+
			"PREFIX dbont: <http://dbpedia.org/ontology/>"+
			"PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>"+
			"PREFIX dbo: <http://dbpedia.org/ontology/>"+

			"SELECT DISTINCT  ?long "+
			"WHERE {"+
					
			      	"?actor dbont:birthPlace ?place ."+
			      	//"?place geo:lat ?lat ."+
			      	"?place geo:long ?long ."+
			      	"FILTER(?actor=<"+fakeactor.toString()+">)"+
			      	"}";

		
		
		// now creating query object
		com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString2);
		// initializing queryExecution factory with remote service.
		
		QueryExecution qexec = QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql", query);
		
		final com.hp.hpl.jena.query.ResultSet lng = qexec.execSelect();
        //ResultSet lngs = (java.sql.ResultSet) qexec.execSelect();
        String w= ResultSetFormatter.asText(lng, query);  
        	//qexec.execSelect().getResultVars();
        //System.out.println(w);
		ResultSetFormatter.out(System.out, lng, query);
	

Open in new window

0
Comment
Question by:Atouray
  • 5
  • 4
9 Comments
 
LVL 92

Expert Comment

by:objects
ID: 34948094
check that the query is returning a valid result set
0
 

Author Comment

by:Atouray
ID: 34948133
The query is returning a valid result set. Anymore ideas?
0
 
LVL 92

Expert Comment

by:objects
ID: 34948175
>         String w= ResultSetFormatter.asText(lng, query);  

this line appears to be actually working
whats the value of w?
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 

Author Comment

by:Atouray
ID: 34948194
This the line that gives me the error!
0
 
LVL 92

Expert Comment

by:objects
ID: 34948204
no the errors coming from:

            ResultSetFormatter.out(System.out, lng, query);
0
 

Author Comment

by:Atouray
ID: 34948246
If I run this method without the String w= ResultSetFormatter.asText(lng, query);   I have proper results!
What do you suggest me to use instead of ResultSetFormatter.out(System.out, lng, query);  ?
0
 
LVL 92

Accepted Solution

by:
objects earned 2000 total points
ID: 34948321
you can only do one or the other. once you have read the result set you cannot read it again
the first one would probably be better, as you can then do what you want with the string
0
 

Author Comment

by:Atouray
ID: 34948352
But the first one gives me errors...not working at all!
0
 
LVL 92

Expert Comment

by:objects
ID: 34948375
what errors?
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Composite queries are used to retrieve the results from joining multiple queries after applying any filters. UNION, INTERSECT, MINUS, and UNION ALL are some of the operators used to get certain desired results.​
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
This video teaches viewers about errors in exception handling.
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question