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* 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, | |
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* See the License for the specific language governing permissions and | |
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*/ | |
package tdb.examples; | |
import com.hp.hpl.jena.query.Dataset ; | |
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.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(); | |
} | |
} |