Question

使用Jena创建sparql查询时出现词汇错误。以下是我的源代码。错误说 com.hp.hpl.jena.query.QueryParseException：第5行第92列的词法错误。遇到错误：“”（32），之后：“not”。

    package mas;
    import agent.core.onto.Ontology;
    import com.hp.hpl.jena.ontology.OntDocumentManager;
    import com.hp.hpl.jena.ontology.OntModel;
    import com.hp.hpl.jena.ontology.OntModelSpec;
    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.QuerySolution;
    import com.hp.hpl.jena.query.ResultSet;
    import com.hp.hpl.jena.rdf.model.Model;
    import com.hp.hpl.jena.rdf.model.ModelFactory;
    import com.hp.hpl.jena.rdf.model.ModelMaker;
    import java.io.FileInputStream;

    /**
    *
    * @author Naveed Khan
    */
    public class NewClass {

      public static void main(String arg[])
       {
        NewClass obj=new NewClass(); 
        String PREFIX="PREFIX seo:            <http://www.seontology.org/test/specificOnto.owl#> 
       PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
       PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> "
        Model m = obj.getModel();
        String querystr=PREFIX + 
                " \n SELECT  ?individualaff ?uc "
                        + "WHERE { "
                        + "?individualaff  seo:Requirements_Content ?c. "
                        + "filter not exists {?individualaff seo:hasUsecase ?uc } "
                        + "}";
        try 
        {
            Query query = QueryFactory.create(querystr) ;
            QueryExecution qexec = QueryExecutionFactory.create(query, m) ;
            ResultSet results = qexec.execSelect() ;
            QuerySolution soln = results.nextSolution() ;
        }catch(Exception ex) { 
         ex.printStackTrace(); }



}
private OntModel getModel()
{
    OntModel model = null;
    if (model == null) {

    model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM, null);
    try {

        model.read(new FileInputStream(agent.core.onto.Config.SOURCE_FILE), Ontology.BASE);

    } catch (Exception e) {
        System.out.println("Loading Model failed:"+ e);
    }
  } 
        if (model != null)
          return model;
        else
          return null;
        }
        }

The error says
com.hp.hpl.jena.query.QueryParseException: Lexical error at line 5, column 92.     Encountered: " " (32), after : "not".

Sparql词汇错误遇到：＆＃34; ＆＃34; （32），之后：＆＃34; not＆＃34;

0 个答案: