This example describes how to add/remove a set of triples over a named graph stored in an Oracle NoSQL Database.
import com.hp.hpl.jena.graph.*; import com.hp.hpl.jena.query.*; import com.hp.hpl.jena.rdf.model.Model; import oracle.rdf.kv.client.jena.*; public class Example1b { public static void main(String[] args) throws Exception { String szStoreName = args[0]; String szHostName = args[1]; String szHostPort = args[2]; String szGraphName = args[3]; OracleNoSqlConnection conn = OracleNoSqlConnection.createInstance(szStoreName, szHostName, szHostPort); // This object will handle operations over the named graph OracleGraphNoSql graph = new OracleNamedGraphNoSql(szGraphName, conn); // Clear the named graph including inferred triples graph.clearRepository(); // Add triples graph.add(Triple.create(Node.createURI("u:John"), Node.createURI("u:parentOf"), Node.createURI("u:Mary"))); graph.add(Triple.create(Node.createURI("u:Mary"), Node.createURI("u:parentOf"), Node.createURI("u:Jack"))); String queryString = " select ?x ?y WHERE {?x <u:parentOf> ?y}"; System.out.println("Execute query " + queryString); Model model = new OracleModelNoSql(graph); Query query = QueryFactory.create(queryString); QueryExecution qexec = QueryExecutionFactory.create(query, model); try { ResultSet results = qexec.execSelect(); ResultSetFormatter.out(System.out, results, query); } finally { qexec.close(); } graph.delete(Triple.create(Node.createURI("u:John"), Node.createURI("u:parentOf"), Node.createURI("u:Mary"))); queryString = "select ?x ?y ?z WHERE {?x ?y ?z}"; System.out.println("Execute query " + queryString); query = QueryFactory.create(queryString); qexec = QueryExecutionFactory.create(query, model); try { ResultSet results = qexec.execSelect(); ResultSetFormatter.out(System.out, results, query); } finally { qexec.close(); } model.close(); conn.dispose(); } }
The following are the commands to compile and run this example, as 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 Example1b.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 Example1b <store_name> \ <host_name> <host_port> <graph_name> Execute query select ?x ?y WHERE {?x <u:parentOf>?y} ----------------------- | x | y | ======================= | <u:Mary> | <u:Jack> | | <u:John> | <u:Mary> | ----------------------- Execute query select ?x ?y ?z WHERE {?x ?y ?z} -------------------------------------- | x | y | z | ====================================== | <u:Mary> | <u:parentOf> | <u:Jack> | --------------------------------------