| /* |
| * 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 sdb.examples; |
| |
| import org.apache.jena.query.*; |
| |
| import org.apache.jena.sdb.SDBFactory; |
| import org.apache.jena.sdb.Store; |
| import org.apache.jena.sdb.store.DatasetStore; |
| |
| /** Example of the usual way to connect store and issue a query. |
| * A description of the connection and store is read from file "sdb.ttl". |
| * Use and password come from environment variables SDB_USER and SDB_PASSWORD. |
| */ |
| |
| public class Ex1 |
| { |
| static public void main(String...argv) |
| { |
| String queryString = "SELECT * { ?s ?p ?o }" ; |
| Query query = QueryFactory.create(queryString) ; |
| Store store = SDBFactory.connectStore("sdb.ttl") ; |
| |
| // Must be a DatasetStore to trigger the SDB query engine. |
| // Creating a graph from the Store, and adding it to a general |
| // purpose dataset will not necesarily exploit full SQL generation. |
| // The right answers will be obtained but slowly. |
| |
| Dataset ds = DatasetStore.create(store) ; |
| QueryExecution qe = QueryExecutionFactory.create(query, ds) ; |
| try { |
| ResultSet rs = qe.execSelect() ; |
| ResultSetFormatter.out(rs) ; |
| } finally { qe.close() ; } |
| |
| // Close the SDB conenction which also closes the underlying JDBC connection. |
| store.getConnection().close() ; |
| store.close() ; |
| } |
| } |