Examples of spark.api.DataSource

spark.api.DataSource
Entry point for working with the Spark API. The DataSource is a factory for connections and implementations should use standard JavaBean patterns to specify any necessary connection properties (host, port, etc). Depending on the implementation, a DataSource might be a thin wrapper around a collection of source-specific connection properties, or it might provide additional features such as connection pooling.

      logger.debug("metadata = {}", ((ProtocolResult)r).getMetadata());
    }
  }
  
  public static void testQuery() throws Exception {
    DataSource myDS = new ProtocolDataSource("http://DBpedia.org/sparql");
    Connection conn = myDS.getConnection(NoCredentials.INSTANCE);
    Command query = conn.createCommand("SELECT ?p ?o WHERE { <http://dbpedia.org/resource/Terry_Gilliam> ?p ?o }");    
    Solutions solutions = query.executeQuery();
    
    showMetadata(solutions);
    logger.debug("vars = {}", solutions.getVariables());
    int row = 0;
    while(solutions.next()) {
      logger.debug("Row {}: {}", ++row, solutions.getResult());
    }
    solutions.close();
    query.close();
    conn.close();
    myDS.close();
  }

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    conn.close();
    myDS.close();
  }
  
  public static void testQuery2() throws Exception {
    DataSource myDS = new ProtocolDataSource("http://DBpedia.org/sparql");
    Connection conn = myDS.getConnection(NoCredentials.INSTANCE);
    Command query = conn.createCommand("SELECT ?p ?o WHERE { <http://dbpedia.org/resource/Terry_Gilliam> ?p ?o }");    
    Solutions solutions = query.executeQuery();
    
    showMetadata(solutions);
    logger.debug("vars = {}", solutions.getVariables());
    int row = 0;
    for(Map<String, RDFNode> solution : solutions) {
      logger.debug("Row {}: {}", ++row, solution);
    }
    solutions.close();
    query.close();
    conn.close();
    myDS.close();
  }

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    conn.close();
    myDS.close();
  }
  
  public static void testAsk() throws Exception {
    DataSource myDS = new ProtocolDataSource("http://DBpedia.org/sparql");
    Connection conn = myDS.getConnection(NoCredentials.INSTANCE);
    Command query = conn.createCommand("ASK { <http://dbpedia.org/resource/Terry_Gilliam> ?p ?o }");    
    
    Result r = query.execute();
    showMetadata(r);
    logger.debug("result = {}", ((BooleanResult)r).getResult());
    
    r.close();
    query.close();
    conn.close();
    myDS.close();
  }

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    conn.close();
    myDS.close();
  }
  
  public static void testAsk2() throws Exception {
    DataSource myDS = new ProtocolDataSource("http://DBpedia.org/sparql");
    Connection conn = myDS.getConnection(NoCredentials.INSTANCE);
    Command query = conn.createCommand("ASK { <http://dbpedia.org/resource/Terry_Gilliam> ?p ?o }");    
    
    logger.debug("result = {}", query.executeAsk());
    
    query.close();
    conn.close();
    myDS.close();
  }

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    String host = args[0];
    String port = args[1];
    String query = args[2];
    System.out.println("Connecting to " + host + ":" + port);
    DataSource ds = new SHPDataSource(host, Integer.parseInt(port));
    Connection conn = ds.getConnection(NoCredentials.INSTANCE);
    Command command = conn.createCommand(query);
    command.setTimeout(120000);
    
    System.out.println("Executing query....");
    Solutions results = command.executeQuery();

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  private static final Logger logger = LoggerFactory.getLogger(TestSherpaClient.class);
  
  public Solutions helpExecuteQuery(DummySherpaServer server, int batchSize) {
    InetSocketAddress serverAddress = server.getAddress();
    DataSource ds = new SHPDataSource(serverAddress.getHostName(),
        serverAddress.getPort());
    Connection conn = ds.getConnection(NoCredentials.INSTANCE);
    Command command = conn
        .createCommand("SELECT ?x ?y WHERE { this should be a real query but the test doesn't actually do anything real.");
    ((SHPCommand) command).setBatchSize(batchSize);
    return command.executeQuery();
  }

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          }
        });
    InetSocketAddress serverAddress = server.getAddress();
    
    try {
      DataSource ds = new SHPDataSource(serverAddress.getHostName(), serverAddress.getPort());
      Connection conn = ds.getConnection(NoCredentials.INSTANCE);
      Command command = conn.createCommand("SELECT ?x ?y WHERE { this should be a real query but the test doesn't actually do anything real. }");
      command.setTimeout(1234);
      command.executeQuery();
      
      // Kind of tricky here - the keys and values are now Avro Utf8 instances which don't compare equal to Strings

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Related Classes of spark.api.DataSource

sherpa.client.TestSherpaClient

sherpaclient

spark.protocol.SparqlQuery

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