Examples of com.datastax.driver.core.Session

com.datastax.driver.core.Session
A session holds connections to a Cassandra cluster, allowing it to be queried. Each session maintains multiple connections to the cluster nodes, provides policies to choose which node to use for each query (round-robin on all nodes of the cluster by default), and handles retries for failed query (when it makes sense), etc...
Session instances are thread-safe and usually a single instance is enough per application. As a given session can only be "logged" into one keyspace at a time (where the "logged" keyspace is the one used by query if the query doesn't explicitely use a fully qualified table name), it can make sense to create one session per keyspace used. This is however not necessary to query multiple keyspaces since it is always possible to use a single session with fully qualified table name in queries.

        dataLoader.load(new FileDataSet(file), loadingOption);
    }


    private static void cqlDataSetLoad(String host, String port, String file) {
        Cluster cluster = new Cluster.Builder().addContactPoints(host).withPort(Integer.parseInt(port)).build();
        Session session = cluster.connect();
        CQLDataLoader dataLoader = new CQLDataLoader(session);
        dataLoader.load(new FileCQLDataSet(file, false));
    }

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    // Drop the keyspace
    cm.dropKeyspace(definition.getName());


    // Make sure it is really dropped
    Session session = cm.getEmptySession();
    boolean caught = false;
    try {
      session.execute("USE " + definition.getName() + ";");
    } catch(InvalidQueryException e) {
      caught = true;
    }
    session.close();
    assertTrue(caught);


    cm.teardown();
  }

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    assertEquals("one",result.get("index_1"));
    assertEquals("two",result.get("index_2"));
    assertEquals("three",result.get("value"));


    // Make sure we have saved both versions of the keyspace
    Session session = cm.getEmptySession();
    StringBuilder sb = new StringBuilder();
    sb.append("SELECT id from \"");
    sb.append(cm.getRhombusKeyspaceName());
    sb.append("\".\"__keyspace_definitions\" where name='");
    sb.append(NewKeyspaceDefinition.getName());
    sb.append("';");
    ResultSet resultSet = session.execute(sb.toString());
    Iterator<Row> rsIter = resultSet.iterator();
    int counter = 0;
    while(rsIter.hasNext()) {
      counter++;
      rsIter.next();

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  @Test
  public void testKeyspaceCreate() throws IOException {
    ConnectionManager cm = TestHelpers.getTestConnectionManager();
    cm.buildCluster();
    Session session = cm.getEmptySession();
    assertNotNull(session);


    //Drop the functional keyspace if it exists
    try {
      session.execute("DROP KEYSPACE functional_create");
    } catch (InvalidQueryException e) {
      //Ignore
    }


    //Create the functional keyspace
    session.execute("CREATE KEYSPACE functional_create WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 }");


    //Change to our functional testing keyspace
    session.execute("USE functional_create");


    //Drop the functional keyspace
    try {
      session.execute("DROP KEYSPACE functional_create");
    } catch (InvalidQueryException e) {
      //Ignore
    }


    //Shutdown the session
    session.close();


    //Teardown the connection manager
    cm.teardown();
  }

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      indexValues.put("user_id", UUID.fromString("00000003-0000-0030-0040-000000030000"));


      UUID stop = UUID.fromString(uuidList.get(nDataItems-1));
      CDefinition cDefinition = definition.getDefinitions().get("object2");
      BaseCQLStatementIterator unBoundedIterator = (BaseCQLStatementIterator) CObjectCQLGenerator.makeCQLforList(KEYSPACE_NAME, shardIdLists, cDefinition, indexValues, CObjectOrdering.DESCENDING, null, stop, 10l, true, false, false);
      Session session = cm.getRhombusSession(definition);
      CQLExecutor cqlExecutor = new CQLExecutor(session, true, definition.getConsistencyLevel());
      CQLExecutorIterator cqlExecutorIterator = new CQLExecutorIterator(cqlExecutor, unBoundedIterator);
      cqlExecutorIterator.setPageSize(nDataItems);

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      indexValues.put("user_id", UUID.fromString("00000003-0000-0030-0040-000000030000"));


      UUID stop = UUID.fromString(uuidList.get(nDataItems-1));
      CDefinition cDefinition = definition.getDefinitions().get("object2");
      BaseCQLStatementIterator unBoundedIterator = (BaseCQLStatementIterator) CObjectCQLGenerator.makeCQLforList(KEYSPACE_NAME, shardIdLists, cDefinition, indexValues, CObjectOrdering.DESCENDING, null, stop, 10l, true, false, false);
      Session session = cm.getRhombusSession(definition);
      CQLExecutor cqlExecutor = new CQLExecutor(session, true, definition.getConsistencyLevel());
      CQLExecutorIterator cqlExecutorIterator = new CQLExecutorIterator(cqlExecutor, unBoundedIterator);
      cqlExecutorIterator.setPageSize(nDataItems);

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      criteria.setIndexKeys(indexValues);


      CObjectCQLGenerator cqlGenerator = om.getCqlGenerator_ONLY_FOR_TESTING();
      CQLStatementIterator unBoundedIterator = cqlGenerator.makeCQLforList(objectType, criteria, false);


      Session session = cm.getRhombusSession(definition);
      CQLExecutor cqlExecutor = new CQLExecutor(session, true, definition.getConsistencyLevel());
      CQLExecutorIterator cqlExecutorIterator = new CQLExecutorIterator(cqlExecutor, unBoundedIterator);
      cqlExecutorIterator.setPageSize(nDataItems-1);

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      indexValues.put("user_id", UUID.fromString("00000003-0000-0030-0040-000000030000"));


      UUID stop = UUID.fromString(uuidList.get(nDataItems-1));
      CDefinition cDefinition = definition.getDefinitions().get("object2");
      BaseCQLStatementIterator unBoundedIterator = (BaseCQLStatementIterator) CObjectCQLGenerator.makeCQLforList(KEYSPACE_NAME, shardIdLists, cDefinition, indexValues, CObjectOrdering.DESCENDING, null, stop, 10l, true, false, false);
      Session session = cm.getRhombusSession(definition);
      CQLExecutor cqlExecutor = new CQLExecutor(session, true, definition.getConsistencyLevel());
      CQLExecutorIterator cqlExecutorIterator = new CQLExecutorIterator(cqlExecutor, unBoundedIterator);
      cqlExecutorIterator.setPageSize((nDataItems/5));

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    final int queriesSize = queries.size();
    final int proThread = Math.max(1, queriesSize / conf.queryImport.maxThreadsProImport);


    LOG.debug("Starting parallel import for {} queries, {} pro thread", queriesSize, proThread);
    Session cassSession = session.getSession();


    List<Future<Void>> futures = new ArrayList<>();
    int startIndex = 0;
    int remaining = queriesSize;
    while (remaining > 0) {

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            } 
        }
        String query = select().all().from(db, table).where(eq(keycol, key))
                .getQueryString();
        Cluster cluster = Cluster.builder().addContactPoints("localhost").build();
        Session session = cluster.connect(db);
        ResultSet rs = session.execute(query);
        return convertResultSet(rs);
    }

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