Hi All
I am using Jena to hopefully query the DBPEDIA ontology for data about a
specific person I am using the following query
*
*
*PREFIX foaf: <http://xmlns.com/foaf/0.1/>*
*SELECT ?name ?uri*
*WHERE {*
* ?uri a foaf:Person.*
* ?uri foaf:name ?name.*
* FILTER (langMatches(lang(?name), "en")).*
* FILTER( regex(?name, '^Paula Creamer', 'i') ) *
*}*
The code I am using is as follows, am I right in thinking that because I do
not have a local ontology their is no need for a model to be present? I just
wish to query the data.
*out.println("<p>QUERYBUILDER</p>");*
* // retrieve parameters*
* String param = request.getParameter("param");*
* out.println("<p>THIS IS THE PARAMETER PASSSED IN: " + param +
"</p>");*
* Query query = null;*
*
*
* // set query string*
* String queryString =*
* "PREFIX rdf: <
http://www.w3.org/1999/02/22-rdf-syntax-ns#>"*
* + "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#
>"*
* + "PREFIX foaf: <http://xmlns.com/foaf/0.1/>"*
* + "SELECT DISTINCT ?name ?uri "*
* + "WHERE{"*
* + "?uri a foaf:Person."*
* + "?uri foaf:name ?name."*
* + "FILTER(langMatches(lang(?name),'en'))."*
* + "FILTER(regex(?name,'^" + param + "','i') )}";*
*
*
* query = QueryFactory.create(queryString);*
* out.println("<p>query created</p>");*
*
*
* QueryExecution qexec = QueryExecutionFactory.sparqlService("
http://dbpedia.org/sparql";, query);*
* out.println("<p>query executed</p>");*
* *
* ResultSet results = qexec.execSelect();*
* out.println("<p>iterator executed</p>");*
* try {*
* while(results.hasNext()){*
* int x = 0;*
* QuerySolution soln = results.nextSolution();*
* Resource r = soln.getResource("uri");*
* out.println("result: " + x);*
* x ++;*
* }*
* } catch (Exception e) {*
* out.println(e.getCause());*
* } finally {*
* qexec.close();*
* }*
This code is all ran through a very basic servlet at the moment (trying to
keep it simple for experimentation purposes), when I run the code and pass
in someone's name that I know is available such as 'Angelina Jolie' I get
an
*
*
*HttpException: 500 SPARQL Request Failed*
error does anyone see where I am going wrong, thanks in advance.
--
Regards
Mark
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