This uses analyze method in the
OracleDatasetGraphNoSql
class to
generate data sampling from the dataset. In this example, data
sampling is generated using a sampling rate with respect to all
triples/quads stored in the dataset.
import org.openjena.riot.Lang; import oracle.rdf.kv.client.jena.*; public class Example16b { public static void main(String[] args) throws Exception { String szStoreName = args[0]; String szHostName = args[1]; String szHostPort = args[2]; double iSampRate = Double.parseDouble(args[3]); // Create Oracle NoSQL connection OracleNoSqlConnection conn = OracleNoSqlConnection.createInstance(szStoreName, szHostName, szHostPort); // Create an Oracle DatasetGraphNoSql object to manage // the dataset in the Oracle NoSQL Database OracleGraphNoSql graph = new OracleGraphNoSql(conn); DatasetGraphNoSql datasetGraph = DatasetGraphNoSql.createFrom(graph); // Close graph as it is no longer needed graph.close(); // Clear dataset and close it as it is needed just to clear the // dataset datasetGraph.clearRepository(); // Load data from file into the Oracle NoSQL Database DatasetGraphNoSql.load("family.rdf", Lang.RDFXML, conn, "http://example.com"); // Analyze the default graph and generate sampling data long sizeSamp = datasetGraph.analyze(iSampRate); System.out.println("sampling size is " + sizeSamp); // Close connection 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 Example16.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 Example16b <store_name>\ <host_name> <host_port> 0.005 sampling size is 5