Load DBpedia locally using Jena TDB?

Question

I need to perform a query against DBpedia:

SELECT DISTINCT ?poi ?lat ?long ?photos ?template ?type ?label WHERE {
           


        

Answer 1

To let Jena index locally :

/** The Constant tdbDirectory. */
public static final String tdbDirectory = "C:\\TDBLoadGeoCoordinatesAndLabels"; 

/** The Constant dbdump0. */
public static final String dbdump0 = "C:\\Users\\Public\\Documents\\TDB\\dbpedia_3.8\\dbpedia_3.8.owl";

/** The Constant dbdump1. */
public static final String dbdump1 = "C:\\Users\\Public\\Documents\\TDB\\geo_coordinates_en\\geo_coordinates_en.nt";

 ...

Model tdbModel = TDBFactory.createModel(tdbDirectory);<\n>

/*Incrementally read data to the Model, once per run , RAM > 6 GB*/
FileManager.get().readModel( tdbModel, dbdump0);
FileManager.get().readModel( tdbModel, dbdump1, "N-TRIPLES");
FileManager.get().readModel( tdbModel, dbdump2, "N-TRIPLES");
FileManager.get().readModel( tdbModel, dbdump3, "N-TRIPLES");
FileManager.get().readModel( tdbModel, dbdump4, "N-TRIPLES");
FileManager.get().readModel( tdbModel, dbdump5, "N-TRIPLES");
FileManager.get().readModel( tdbModel, dbdump6, "N-TRIPLES");
tdbModel.close();

To query Jena:

String queryStr = "dbpedia query ";

Dataset dataset = TDBFactory.createDataset(tdbDirectory);
Model tdb = dataset.getDefaultModel();

Query query = QueryFactory.create(queryStr);
QueryExecution qexec = QueryExecutionFactory.create(query, tdb);

/*Execute the Query*/
ResultSet results = qexec.execSelect();

while (results.hasNext()) {
    // Do something important
}

qexec.close();
tdb.close() ;