Using the mongodb cxx driver in a cmake c++ project

Question

I am new to cmake and I want to connect to a mongodb using c++ and the latest mongodb cxx driver. I managed to compile and install the driver but now I stuck with using it in my cmake project.

I installed the mongodb driver with the default settings, so it's located under /usr/local/lib/include/mongocxx/v_noabi/mongocxx.

In my cmake file i manged to get the includes resolved with:

include_directories(/usr/local/lib/include/mongocxx/v_noabi /usr/local/lib/include/bsoncxx/v_noabi)

but I don't know how to actually link the driver libs to my executable. Could any one please help me?

Answer 1

You shouldn't need to do it that way. You can and should find the C++11 driver via either CMake's find_package or via pkg_check_modules subsystems. The C++11 driver supports both.

Answer 2

I had done it linking all what is linked on mongocxx driver docs and using CMake 'find_package':

find_package(libmongocxx REQUIRED)
find_package(libbsoncxx REQUIRED)
include_directories(${LIBMONGOCXX_INCLUDE_DIR})
include_directories(${LIBBSONCXX_INCLUDE_DIR})
include_directories("/usr/local/include/mongocxx/v_noabi")
include_directories("/usr/local/include/bsoncxx/v_noabi")
include_directories("/usr/local/include/libmongoc-1.0")
include_directories("/usr/local/include/libbson-1.0")
include_directories("/usr/local/lib")

add_executable(YOUR_PROJECT ${SOURCE_FILES})

target_link_libraries(YOUR_PROJECT ${LIBMONGOCXX_LIBRARIES})
target_link_libraries(YOUR_PROJECT ${LIBBSONCXX_LIBRARIES})

Answer 3

This work for me:

cmake_minimum_required(VERSION 3.10)
project(cmongodb)

set(CMAKE_CXX_STANDARD 14)

find_package(libbsoncxx-static REQUIRED)
find_package(libmongocxx-static REQUIRED)

include_directories(${LIBMONGOCXX_STATIC_LIBRARIES})
include_directories(${LIBBSONCXX_STATIC_LIBRARIES})
include_directories(${LIBMONGOCXX_STATIC_INCLUDE_DIRS})
include_directories(${LIBBSONCXX_STATIC_INCLUDE_DIRS})

message(STATUS "${LIBMONGOCXX_STATIC_LIBRARIES}")
message(STATUS "${LIBMONGOCXX_STATIC_INCLUDE_DIRS}")

message(STATUS "${LIBBSONCXX_STATIC_LIBRARIES}")
message(STATUS "${LIBBSONCXX_STATIC_INCLUDE_DIRS}")

add_executable(cmongodb main.cpp mymongo.cpp mymongo.h)

target_link_libraries(cmongodb ${LIBMONGOCXX_STATIC_LIBRARIES} ${LIBBSONCXX_STATIC_LIBRARIES})

Here I install mongo db in prefix static. Commonly, you will romve all

static and _STATIC

Answer 4

Steps for setting up the MongoDB C++ driver in CLion on macOS Mojave:

1. brew install mongo-cxx-driver (if you run into any error saying that something is missing, then brew install it)

2. Open CLion and create a file for the hello world code provided by the MongoDB documentation:

    #include <iostream>

    #include <bsoncxx/builder/stream/document.hpp>
    #include <bsoncxx/json.hpp>

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

    int main(int, char**) {
        mongocxx::instance inst{};
        mongocxx::client conn{mongocxx::uri{}};

        bsoncxx::builder::stream::document document{};

        auto collection = conn["testdb"]["testcollection"];
        document << "hello" << "world";

        collection.insert_one(document.view());
        auto cursor = collection.find({});

        for (auto&& doc : cursor) {
            std::cout << bsoncxx::to_json(doc) << std::endl;
        }
    }

3. Let CLion know where it can find the driver files by setting CMakeLists.txt to:

# replace PROJECT_NAME by the name of your clion project

cmake_minimum_required(VERSION 3.15)
project(PROJECT_NAME)

set(CMAKE_CXX_STANDARD 14)

add_executable(PROJECT_NAME main.cpp)

find_package(libmongocxx REQUIRED)
find_package(libbsoncxx REQUIRED)
include_directories(${LIBMONGOCXX_INCLUDE_DIR})
include_directories(${LIBBSONCXX_INCLUDE_DIR})
include_directories("/usr/local/include/mongocxx/v_noabi")
include_directories("/usr/local/include/bsoncxx/v_noabi")
include_directories("/usr/local/include/libmongoc-1.0")
include_directories("/usr/local/include/libbson-1.0")
include_directories("/usr/local/lib")


target_link_libraries(PROJECT_NAME ${LIBMONGOCXX_LIBRARIES})
target_link_libraries(PROJECT_NAME ${LIBBSONCXX_LIBRARIES})

Takes 5 minutes, no C driver, no running into weird issues while trying to build the drivers.