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Example1c.java: Create an inferred graph and add/delete triples
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## Example1c.java: Create an inferred graph and add/delete triples

This example describes how to add inferred triples for a default graph. Inferred triples are managed in the RDF Graph feature through an InferredGraphNoSql object. Triples in the inferred graph are tagged with an integer rulebase ID.

    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();
      }
    }

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

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Example1b.java: Create a named graph and add/delete triples | Home | Example1d.java: Create an inferred graph and add/delete triples