使用MongoDB + MongoCXX进行原子操作

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/stdx.hpp>
#include <mongocxx/uri.hpp>

int main() {
    mongocxx::instance instance{}; // 初始化MongoDB C++驱动程序实例
    mongocxx::client client{mongocxx::uri{"mongodb://localhost:27017"}};
    auto database = client["mydb"];
    auto collection = database["mycollection"];

    // 原子增加操作
    bsoncxx::builder::stream::document update_doc{};
    update_doc << "$inc" << open_document << "counter"<< 1 << close_document;

    bsoncxx::builder::stream::document filter_doc{};
    filter_doc << "_id" << "some_document_id";

    auto result = collection.update_one(filter_doc.view(), update_doc.view());

    if (result) {
        std::cout << "Matched " << result->matched_count() << " document(s)" << std::endl;
        std::cout << "Modified " << result->modified_count() << " document(s)" << std::endl;
    } else {
        std::cout << "No documents matched the filter criteria." << std::endl;
    }

    return 0;
}