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.

    }
    CassandraVirtualDataWindow result = null;
    synchronized (_cluster) {
      try {
        _log.info("Started connecting to cluster...");
        final Session session = _cluster.connect(_configuration
            .getKeyspace());
        _log.info("Finished connecting to cluster...");


        result = new CassandraVirtualDataWindow(session,
            _configuration.getTable(), context);

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    public <T> T executeWithSession(String schemaName, SessionCallable<T> sessionCallable)
    {
        NoHostAvailableException lastException = null;
        for (int i = 0; i < 2; i++) {
            Session session = getSession(schemaName);
            try {
                return sessionCallable.executeWithSession(session);
            }
            catch (NoHostAvailableException e) {
                lastException = e;

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
        .withPort(9142)
        .build();
    Session session = cluster.connect("cassandra_unit_keyspace");


    ResultSet result = session.execute("select * from testCQLTable1 WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570717");
    String val = result.iterator().next().getString("value");
    assertEquals("1- Cql loaded string", val);


    result = session.execute("select * from testCQLTable2 WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570727");
    val = result.iterator().next().getString("value");
    assertEquals("2- Cql loaded string", val);
  }

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
        .withPort(9142)
        .build();
    Session session = cluster.connect("myownkeyspace");
    ResultSet result = session.execute("select * from testCQLTableKS WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570787");
    String val = result.iterator().next().getString("value");
    assertEquals("KS- Cql loaded string", val);
  }

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
        .withPort(9142)
        .build();
    Session session = cluster.connect("cassandra_unit_keyspace");
    ResultSet result = session.execute("select * from testCQLTableRootLocation WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570797");
    String val = result.iterator().next().getString("value");
    assertEquals("Root- Cql loaded string", val);
  }

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
        .withPort(9142)
        .build();
    Session session = cluster.connect("cassandra_unit_keyspace");
    ResultSet result = session.execute("select * from testCQLTable WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570737");
    String val = result.iterator().next().getString("value");
    assertEquals("Cql loaded string", val);
  }

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
        .withPort(9142)
        .build();
    Session session = cluster.connect("cassandra_unit_keyspace");
    ResultSet result = session.execute("select * from testCQLTable1 WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570717");
    String val = result.iterator().next().getString("value");
    assertEquals("1- Cql loaded string", val);
  }

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  private void test() {
    Cluster cluster = Cluster.builder()
        .addContactPoints("127.0.0.1")
            .withPort(9142)
        .build();
    Session session = cluster.connect("cassandra_unit_keyspace");
    ResultSet result = session.execute("select * from testCQLTable WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570737");
    String val = result.iterator().next().getString("value");
    assertEquals("Cql loaded string", val);
  }

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        case cql:
          dataset = dataSetLocations(testContext, cassandraDataSet);
          datasetIterator = dataset.listIterator();


          Cluster cluster = new Cluster.Builder().addContactPoints(host).withPort(port).build();
          Session session = cluster.connect();
          
          CQLDataLoader cqlDataLoader = new CQLDataLoader(session);
          while (datasetIterator.hasNext()) {
            String next = datasetIterator.next();
            boolean dropAndCreateKeyspace = datasetIterator.previousIndex() == 0;

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        String[] args = {"-f", targetFileDataSet, "-h", host, "-p", port};
        CassandraUnitCommandLineLoader.main(args);


        com.datastax.driver.core.Cluster cluster =
                new com.datastax.driver.core.Cluster.Builder().addContactPoints(host).withPort(Integer.parseInt(port)).build();
        Session session = cluster.connect();


        ResultSet result = session.execute("select * from mykeyspace.testCQLTable WHERE id=1690e8da-5bf8-49e8-9583-4dff8a570737");
        String val = result.iterator().next().getString("value");
        Assert.assertThat("Cql loaded string",is(val));


        EmbeddedCassandraServerHelper.cleanEmbeddedCassandra();
    }

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