DataStax C/C++ Driver for Apache Cassandra

A C/C++ client driver for Apache Cassandra. This driver works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's Native Protocol (version 1 and 2).

• Code: https://github.com/datastax/cpp-driver
• Docs: http://datastax.github.io/cpp-driver
• JIRA: https://datastax-oss.atlassian.net/browse/CPP
• Mailing List: https://groups.google.com/a/lists.datastax.com/forum/#!forum/cpp-driver-user
• IRC: #datastax-drivers on irc.freenode.net <http://freenode.net>

Functionality

• Completely asynchronous
• Exception safe
• Ad-hoc queries
• Prepared statements
• Batch statements
• Connection pool with auto-reconnect
• Cassandra collections
• Compatibility with binary protocol version 1 and 2
• Authentication (via credentials using SASL PLAIN)
• SSL

Upgrading from a Beta to a RC Release

There were a couple breaking API changes between beta5 and rc1 that are documented in detail here.

Examples

There are several examples provided here: examples.

A Simple Example

#include <cassandra.h>
#include <stdio.h>

int main() {
  /* Setup and connect to cluster */
  CassFuture* connect_future = NULL;
  CassCluster* cluster = cass_cluster_new();
  CassSession* session = cass_session_new();

  /* Add contact points */
  cass_cluster_set_contact_points(cluster, "127.0.0.1,127.0.0.2,127.0.0.3");

  /* Provide the cluster object as configuration to connect the session */
  connect_future = cass_session_connect(session, cluster);

  if (cass_future_error_code(connect_future) == CASS_OK) {
    CassFuture* close_future = NULL;

    /* Build statement and execute query */
    CassStatement* statement
      = cass_statement_new("SELECT keyspace_name "
                           "FROM system.schema_keyspaces", 0);

    CassFuture* result_future = cass_session_execute(session, statement);

    if(cass_future_error_code(result_future) == CASS_OK) {
      /* Retrieve result set and iterate over the rows */
      const CassResult* result = cass_future_get_result(result_future);
      CassIterator* rows = cass_iterator_from_result(result);

      while(cass_iterator_next(rows)) {
        const CassRow* row = cass_iterator_get_row(rows);
        const CassValue* value = cass_row_get_column_by_name(row, "keyspace_name");

        const char* keyspace;
        size_t keyspace_length;
        cass_value_get_string(value, &keyspace, &keyspace_length);
        printf("keyspace_name: '%.*s'\n",
               (int)keyspace_length, keyspace);
      }

      cass_result_free(result);
      cass_iterator_free(rows);
    } else {
      /* Handle error */
      const char* message;
      size_t message_length;
      cass_future_error_message(result_future, &message, &message_length);
      fprintf(stderr, "Unable to run query: '%.*s'\n",
              (int)message_length, message);
    }

    cass_statement_free(statement);
    cass_future_free(result_future);

    /* Close the session */
    close_future = cass_session_close(session);
    cass_future_wait(close_future);
    cass_future_free(close_future);
  } else {
    /* Handle error */
    const char* message;
    size_t message_length;
    cass_future_error_message(connect_future, &message, &message_length);
    fprintf(stderr, "Unable to connect: '%.*s'\n",
            (int)message_length, message);
  }

  cass_future_free(connect_future);
  cass_cluster_free(cluster);
  cass_session_free(session);

  return 0;
}

License

Copyright (c) 2014-2015 DataStax

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.