This example loads an RDF file into Oracle NoSQL Database. The example also queries for all the quads stored in the Oracle NoSQL Database.
import com.hp.hpl.jena.query.*; import com.hp.hpl.jena.sparql.core.DatasetImpl; import org.openjena.riot.Lang; import oracle.rdf.kv.client.jena.*; public class Example2 { public static void main(String[] args) throws Exception { String szStoreName = args[0]; String szHostName = args[1]; String szHostPort = args[2]; System.out.println("Create Oracle NoSQL connection"); OracleNoSqlConnection conn = OracleNoSqlConnection.createInstance(szStoreName, szHostName, szHostPort); System.out.println("Create Oracle NoSQL datasetgraph"); OracleGraphNoSql graph = new OracleGraphNoSql(conn); DatasetGraphNoSql datasetGraph = DatasetGraphNoSql.createFrom(graph); // Close graph, as it is no longer needed graph.close(); // Clear datasetgraph datasetGraph.clearRepository(); // Load data from file into the Oracle NoSQL Database DatasetGraphNoSql.load("example.nt", Lang.NQUADS, conn, "http://example.org/"); // base URI // Create dataset from Oracle NoSQL datasetgraph to execute Dataset ds = DatasetImpl.wrap(datasetGraph); String szQuery = "select * where { graph ?g { ?s ?p ?o } }"; System.out.println("Execute query " + szQuery); Query query = QueryFactory.create(szQuery); QueryExecution qexec = QueryExecutionFactory.create(query, ds); try { ResultSet results = qexec.execSelect(); ResultSetFormatter.out(System.out, results, query); } finally { qexec.close(); } ds.close(); conn.dispose(); } }
The following are the commands to compile and run this example well as the expected output of the java command.
javac -classpath ./:./jena-core-2.7.4.jar:./jena-arq-2.9.4.jar: \ ./sdordfnosqlclient.jar: ./kvclient.jar:./xercesImpl-2.10.0.jar: \ ./slf4j-api-1.6.4.jar:./slf4j-log4j12-1.6.4.jar:./log4j/1.2.16.jar: \ ./jena-iri-0.9.4.jar:./xml-apis-1.4.01.jar Example2.java javac -classpath ./:./jena-core-2.7.4.jar:./jena-arq-2.9.4.jar: \ ./sdordfnosqlclient.jar: ./kvclient.jar:./xercesImpl-2.10.0.jar: \ ./slf4j-api-1.6.4.jar:./slf4j-log4j12-1.6.4.jar:./log4j/1.2.16.jar: \ ./jena-iri-0.9.4.jar:./xml-apis-1.4.01.jar Example2 <store_name> \ <host_name> <host_port> Execute query select * where { graph ?g { ?s ?p ?o } } ------------------------------------------ | s | ========================================== | _:b0 | | <http://example.org/alice/foaf.rdf#me> | | _:b0 | | <http://example.org/alice/foaf.rdf#me> | | _:b0 | | _:b0 | | <http://example.org/alice/foaf.rdf#me> | | <http://example.org/bob/foaf.rdf#me> | | <http://example.org/bob/foaf.rdf#me> | | <http://example.org/bob/foaf.rdf#me> | ------------------------------------------ ----------------------------------------------------- | p | ===================================================== | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | <http://xmlns.com/foaf/0.1/homepage> | | <http://xmlns.com/foaf/0.1/knows> | | <http://www.w3.org/2000/01/rdf-schema#seeAlso> | | <http://xmlns.com/foaf/0.1/name> | | <http://xmlns.com/foaf/0.1/name> | | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | | <http://xmlns.com/foaf/0.1/homepage> | | <http://xmlns.com/foaf/0.1/name> | ----------------------------------------------------- ------------------------------------------ | o | ========================================== | <http://xmlns.com/foaf/0.1/Person> | | <http://xmlns.com/foaf/0.1/Person> | | <http://example.org/bob/> | | _:b0 | | <http://example.org/bob/foaf.rdf> | | "Bob" | | "Alice" | | <http://xmlns.com/foaf/0.1/Person> | | <http://example.org/bob/> | | "Bob" | ------------------------------------------ ------------------------------------------ | g | ========================================== | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/alice/foaf.rdf> | | <http://example.org/bob/foaf.rdf> | | <http://example.org/bob/foaf.rdf> | | <http://example.org/bob/foaf.rdf> | ------------------------------------------