本示例（也可在 storage/ndb/ndbapi-examples/ndbapi_basic/ndbapi_basic_connect.cpp 中找到）演示了如何使用 Ndb_cluster_connection 使用给定的连接字符串连接到 NDB 管理服务器。如果成功，它将获取并打印有关集群的一些信息。如果无法连接到管理服务器或数据节点，它将打印相应的错误并退出。

#include <iostream>
#include <cstdlib>

#include <NdbApi.hpp>

namespace
{
  inline void test_connection(const Ndb_cluster_connection &connection)
  {
    std::cout << "Connected to: " << connection.get_system_name()
              << ",\n\ton port: " << connection.get_connected_port()
              << ",\n\tactive NDBDs: " << connection.get_active_ndb_objects()
              << std::endl;
  }
}

int main(int argc, char **argv)
{
  if (argc != 2)
  {
    std::cout << "Usage: ndb_ndbapi_basic_connect <connectstring>"
              << std::endl;
    return EXIT_FAILURE;
  }

  const char *connectstring = argv[1];

  ndb_init();
  {
    Ndb_cluster_connection connection(connectstring);
    if (connection.connect() != 0)
    {
      std::cout << "Cannot connect to cluster management server" << std::endl;
      return EXIT_FAILURE;
    }

    if (connection.wait_until_ready(30, 0) != 0)
    {
      std::cout << "Cluster was not ready within 30 secs" << std::endl;
      return EXIT_FAILURE;
    }

    // Let's verify connection
    test_connection(connection);
  }
  ndb_end(0);

  return EXIT_SUCCESS;
}