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