| /* |
| * 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(); |
| } |
| } |