package QueryBuilder;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
public class Query4 {
public static void main(String[] args) throws IOException {
InputStream in = new FileInputStream(new File("d:/PROJECT/vc-db-1.rdf"));
// Create an empty in-memory model and populate it from the graph
Model model = ModelFactory.createMemModelMaker().createDefaultModel();
model.read(in,null); // null base URI, since model URIs are absolute
in.close();
// Create a new query
String queryString= "{<http://www.w3.org/2001/vcard-rdf/3.0#> SELECT ?g
WHERE { ?y Given ?g . FILTER regex(?g, 'r', 'i')}}";
Query query = QueryFactory.create(queryString);
// Execute the query and obtain results
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
// Output query results
ResultSetFormatter.out(System.out, results, query);
// Important - free up resources used running the query
qe.close();
}
}
Error
-------
Exception in thread "main" com.hp.hpl.jena.query.QueryParseException:
Encountered " "{" "{ "" at line 1, column 1.
Was expecting one of:
"base" ...
"prefix" ...
"select" ...
"describe" ...
"construct" ...
"ask" ...
at
com.hp.hpl.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:87)
at
com.hp.hpl.jena.sparql.lang.ParserSPARQL11.parse(ParserSPARQL11.java:40)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:132)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:69)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:40)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:28)
at QueryBuilder.Query4.main(Query4.java:25)
