Research_CPS-master/experiment/distrib/bbox/system/asklab/cpsf/apache-jena-3.9.0/src-examples/tdb/examples/ExTDB4.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package tdb.examples;

import org.apache.jena.query.Dataset ;
import org.apache.jena.query.Query ;
import org.apache.jena.query.QueryExecution ;
import org.apache.jena.query.QueryExecutionFactory ;
import org.apache.jena.query.QueryFactory ;
import org.apache.jena.query.ResultSet ;
import org.apache.jena.query.ResultSetFormatter ;
import org.apache.jena.tdb.TDBFactory ;

/** Example of creating a TDB-backed model.
 *  The preferred way is to create a dataset then get the mode required from the dataset.
 *  The dataset can be used for SPARQL query and update
 *  but the Model (or Graph) can also be used.
 *  
 *  All the Jena APIs work on the model.
 *   
 *  Calling TDBFactory is the only place TDB-specific code is needed.
 */

public class ExTDB4
{
    public static void main(String... argv)
    {
        // Direct way: Make a TDB-back Jena model in the named directory.
        String directory = "MyDatabases/DB1" ;
        Dataset dataset = TDBFactory.createDataset(directory) ;
        
        // Potentially expensive query.
        String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }" ;
        // See http://incubator.apache.org/jena/documentation/query/app_api.html
        
        Query query = QueryFactory.create(sparqlQueryString) ;
        QueryExecution qexec = QueryExecutionFactory.create(query, dataset) ;
        ResultSet results = qexec.execSelect() ;
        ResultSetFormatter.out(results) ;
        qexec.close() ;

        dataset.close();
    }
}
