この例では、Oracle NoSQL Databaseに格納されている名前付きグラフに対して一連のトリプルを追加/削除する方法について説明します。

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 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();
  }  
} 

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 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> |
--------------------------------------