この例では、推論されたトリプルをデフォルト・グラフに追加する方法について説明します。推論されたトリプルは、InferredGraphNoSqlオブジェクトを介してRDFグラフ機能で管理されます。推論されたグラフにおけるトリプルには、整数のルールベースIDがタグ付けされます。
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 Example1c { public static void main(String[] args) throws Exception { String szStoreName = args[0]; String szHostName = args[1]; String szHostPort = args[2]; // the rulebase id used for inferred triples int iRuleBaseId = Integer.parseInt(args[3]); OracleNoSqlConnection conn = OracleNoSqlConnection.createInstance(szStoreName, szHostName, szHostPort); // This object handle a model associated to a default graph Model model = OracleModelNoSql.createOracleDefaultModelNoSql(conn); OracleGraphNoSql graph = (OracleGraphNoSql) model.getGraph(); model.removeAll(); // removes all the triples from the associated // model, this will remove all asserted and // inferred triples graph.add(Triple.create(Node.createURI("u:John"), Node.createURI("u:parentOf"), Node.createURI("u:Mary"))); graph.add(Triple.create(Node.createURI("u:John"), Node.createURI("u:parentOf"), Node.createURI("u:Jack"))); graph.add(Triple.create(Node.createURI("u:Amy"), Node.createURI("u:parentOf"), Node.createURI("u:Jack"))); // This object handles all the inferred triples of the default graph // produced with rulebase ID InferredGraphNoSql inferredGraph = new InferredGraphNoSql(conn, iRuleBaseId); inferredGraph.add(Triple.create(Node.createURI("u:Jack"), Node.createURI("u:siblingOf"), Node.createURI("u:Mary"))); inferredGraph.close(); String prefix = " PREFIX ORACLE_SEM_FS_NS: <http://oracle.com/semtech#" + "include_rulebase_id=" + iRuleBaseId + ">"; String szQuery = prefix + " select ?x ?y ?z WHERE {?x ?y ?z} "; System.out.println("Execute query " + szQuery); Query query = QueryFactory.create(szQuery) ; QueryExecution qexec = QueryExecutionFactory.create(query, model); try { ResultSet results = qexec.execSelect(); ResultSetFormatter.out(System.out, results, query); } finally { qexec.close(); } model.close(); conn.dispose(); } }
この例をコンパイルして実行するコマンドと、想定されるJavaコマンドの出力は次のとおりです。
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 Example1c.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 Example1c <store_name> \ <host_name> <host_port> <rule_base_id> Execute query select ?x ?y ?z WHERE {?x ?y ?z} -------------------------------------- | x | y | z | ====================================== | <u:Mary> | <u:siblingOf> | <u:Mary> | | <u:John> | <u:parentOf> | <u:Jack> | | <u:John> | <u:parentOf> | <u:Mary> | | <u:Amy> | <u:parentOf> | <u:Jack> | --------------------------------------