YugabyteDB C++ Driver for YCQL

A modern, feature-rich and highly tunable C/C++ client library for YugabyteDB's Cassandra-compatible YCQL API using exclusively Cassandra's binary protocol and Cassandra Query Language v3.

Getting the Driver

Packages for the driver's dependencies, libuv (1.x) and OpenSSL, are also provided under the dependencies directory for each platform (if applicable). Note: CentOS and Ubuntu use the version of OpenSSL provided with the distribution:

Features

Asynchronous API
Simple, Prepared, and Batch statements
Asynchronous I/O, parallel execution, and request pipelining
Connection pooling
Automatic node discovery
Automatic reconnection
Configurable load balancing
Works with any cluster size
Authentication
SSL
Latency-aware routing
Performance metrics
Tuples and UDTs
Nested collections
Retry policies
Client-side timestamps
Data types
Idle connection heartbeats
Support for materialized view and secondary index metadata
Support for clustering key order, frozen<> and Cassandra version metadata
Blacklist, whitelist DC, and blacklist DC load balancing policies
Custom authenticators
Reverse DNS with SSL peer identity verification support
Randomized contact points
Speculative execution

Compatibility

This driver works exclusively with the Cassandra Query Language v3 (CQL3) and Cassandra's native protocol for YugaByte DB's Cassandra-compatible YCQL API.

Documentation

Home
API
[Getting started guide][getting-started]: https://docs.yugabyte.com/latest/develop/client-drivers/csharp/
Building

Getting Help

Please report any issues on github.

Feedback Requested

Examples

The driver includes several examples in the examples directory.

A Simple Example

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

int main(int argc, char* argv[]) {
  /* Setup and connect to cluster */
  CassFuture* connect_future = NULL;
  CassCluster* cluster = cass_cluster_new();
  CassSession* session = cass_session_new();
  char* hosts = "127.0.0.1";
  if (argc > 1) {
    hosts = argv[1];
  }

  /* Add contact points */
  cass_cluster_set_contact_points(cluster, hosts);

  /* 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 */
    const char* query = "SELECT release_version FROM system.local";
    CassStatement* statement = cass_statement_new(query, 0);

    CassFuture* result_future = cass_session_execute(session, statement);

    if (cass_future_error_code(result_future) == CASS_OK) {
      /* Retrieve result set and get the first row */
      const CassResult* result = cass_future_get_result(result_future);
      const CassRow* row = cass_result_first_row(result);

      if (row) {
        const CassValue* value = cass_row_get_column_by_name(row, "release_version");

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

      cass_result_free(result);
    } 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

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.

mbautin/cassandra-cpp-driver