Question

我有一个小程序试图连接到mongodb并检查如果我希望接收对象它会收到多少个对象。在这种情况下，我甚至无法获得对象的数量，即使除了连接之外什么都不做，我也会对清理进行分段。

我使用GlobalInstance对象维护我的连接并在退出时为我清理。这个函数我从main调用。该计划尚未做任何其他事情。

有关我错误操作的哪些建议我提出了哪些建议？据推测，这与无法调用connection-＆gt; count（）？

有关

非常感谢任何指示。

int foo() {
mongo::client::Options options;
options.setSSLMode(mongo::client::Options::kSSLRequired);
mongo::client::GlobalInstance mongo_connection(options);
mongo::DBClientBase* connection;
if (!mongo_connection.status().isOK()) {
    cout << "Mongo connection not established: "
     << mongo_connection.status() << endl;
}
try {
    mongo::DBClientConnection c(true);
    string error;
    ostringstream mongo_url;
    mongo_url << "mongodb://" << db_username << ":" << db_password << "@"
          << db_host << ":" << db_port << "/" << db_name;
    const mongo::ConnectionString conn_string =
    mongo::ConnectionString::parse(mongo_url.str(), error);
    if (!conn_string.isValid()) {
    cout << "Bad connection string: " << error << endl;
    }
    // Reality check.  Passes.
    cout << "user=" << conn_string.getUser() << endl;
    cout << "pass=" << conn_string.getPassword() << endl;
    cout << "db=  " << conn_string.getDatabase() << endl;
    const auto servers = conn_string.getServers();
    for (const auto& server : servers) {
    cout << "serv=" << server << endl;
    }
    cout << "type=" << conn_string.type() << endl;
    // End reality check.
    connection = conn_string.connect(error);
        cout << "error says: " << error << endl;       // Is empty.
        cout << "conn=" << connection << endl;    // Not zero.
    std::cout << "connected ok" << std::endl;
    cout << connection->getConnectionId() << endl;  // Prints "1".

    // This returns an error 13, not authorized, if I included it.
    //cout << "count: " << connection->count("focus_groups") << endl;
} catch( const mongo::DBException &e ) {
    std::cout << "caught " << e.what() << std::endl;
}
cout << "----------------------------------------------------------------------" << endl;
return 0;
}

/*
  Note that I can do this in the mongo shell with no problem:

  jeff@siegfried:~ $ mongo my_host:27017/my_db --ssl -u my_user -p
  MongoDB shell version: 2.6.3
  Enter password:
  connecting to: my_host:27017/my_db
  > db.focus_groups.count()
  26
  >
*/

我在64位ubuntu 15.04上运行并使用clang 3.6.0进行编译。通过apt-get安装Boost 1.55。我使用ssl支持从HEAD（861699d116627d63e1c914384a66e4e3ea7c23bc）的git编译和安装的传统mongo C ++驱动程序。

Answer 1

这结果是几件事的汇合，但至少这两件事：

当我编译旧版驱动程序时，默认模式是C ++ 03，它与C ++ 11或C ++ 14不是二进制兼容的。
驱动程序对它与使用它的客户端编译的boost版本的差异很敏感。

显示广泛的帖子here。

Mongodb C ++驱动程序，清理失败

1 个答案: