In this blog post, we will explore how to connect to a MongoDB database using C++. MongoDB is a popular NoSQL database, and it offers a C++ driver to facilitate interaction with the database.

Prerequisites

Before we begin, you should have MongoDB installed on your system. Also, ensure that you have the MongoDB C++ driver installed.

Setting up a Connection

To connect to a MongoDB database in C++, you need to first include the necessary header files:

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

Next, you need to create an instance of the MongoDB client and a connection to the MongoDB server:

mongocxx::instance instance{}; // This should be done only once.
mongocxx::client client{mongocxx::uri{}};

Accessing a Database

Once the connection is established, you can access a specific database from the MongoDB server:

mongocxx::database myDb = client["my_database"];

Accessing a Collection

After accessing the database, you can access a collection from that database:

mongocxx::collection myCollection = myDb["my_collection"];

Inserting Data

To insert data into a collection, you can use the following code snippet:

mongocxx::model::insert_one myDocument{bsoncxx::from_json(R"({"key": "value"})")};
myCollection.insert_one(myDocument.view());

Querying Data

You can query data from a collection using the following code snippet:

mongocxx::cursor cursor = myCollection.find({});
for (auto&& doc : cursor) {
    std::cout << bsoncxx::to_json(doc) << std::endl;
}

Conclusion

In this blog post, we’ve learned how to connect to a MongoDB database using C++. The MongoDB C++ driver provides a powerful way to interact with MongoDB from C++ applications.

Make sure to refer to the official MongoDB C++ driver documentation for more advanced usage and capabilities.

Happy coding!

Reference: MongoDB C++ Driver Documentation