I am trying to query the DBPedia using sparql from a javacode For some query it works perfectly anf for another one it doesn't work. I don't think that I have an error in my query because I already tested it in the DBPedia aparql endpoint. Here is my java code:
package ja1;
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.util.*;
public class Q_DBP_Online {
public static void main(String[]args)
{
sparqlTest();
}
public static void sparqlTest()
{
/*String queryString = "SELECT ?o WHERE {"+
"?s ?p ?o ."+
"} LIMIT 10";*/
String str="Obama";
String queryString = "PREFIX pr:<http://xmlns.com/foaf/0.1/>" +
"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>"+
"SELECT DISTINCT ?s ?label WHERE {" +
"?s rdfs:label ?label . "+
"?s a pr:Person."+
"FILTER (lang(?label) = 'en'). "+
"?label bif:contains"+str+" ."+
"}";
Query query = QueryFactory.create(queryString);
QueryExecution qexec = QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql", query);
try
{
ResultSet results = qexec.execSelect();
while(results.hasNext()){
QuerySolution soln = results.nextSolution();
//Literal name = soln.getLiteral("x");
System.out.println(soln);
}
}
finally{
qexec.close();
}
}
}
So the first query which is commented runs perfectly and the second one doesn't run and I get this message in netbeans:
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/rodwan/Desktop/Th_Pr/apache-jena-2.12.1/lib/slf4j-log4j12-1.7.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/rodwan/Desktop/Th_Pr/pellet-2.3.1/lib/jena/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
Exception in thread "main" com.hp.hpl.jena.query.QueryParseException: Encountered " "(" "( "" at line 1, column 169.
Was expecting one of:
"values" ...
"graph" ...
"optional" ...
"minus" ...
"bind" ...
"service" ...
"filter" ...
"{" ...
"}" ...
";" ...
"," ...
"." ...
at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:102)
at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.parse$(ParserSPARQL11.java:53)
at com.hp.hpl.jena.sparql.lang.SPARQLParser.parse(SPARQLParser.java:37)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:148)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:80)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:53)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:41)
at ja1.Q_DBP_Online.sparqlTest(Q_DBP_Online.java:38)
at ja1.Q_DBP_Online.main(Q_DBP_Online.java:18)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)
----------------------------------
I have tried your example, but it seems there are some missing spaces. The following was working for me on DBPedia:
PREFIX pr:<http://xmlns.com/foaf/0.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?s ?label WHERE {?s rdfs:label ?label . ?s a pr:Person . FILTER (lang(?label) = 'en') . ?label bif:contains "Obama" .}
The translation to Java would look like this:
String queryString = "PREFIX pr:<http://xmlns.com/foaf/0.1/>\n" +
"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n"+
"SELECT DISTINCT ?s ?label WHERE {" + "?s rdfs:label ?label . "+
"?s a pr:Person . "+
"FILTER (lang(?label) = 'en') . "+
"?label bif:contains \""+str+"\" ."+
"}";
Hope this helps.