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Esercizi Connessione MongoDB C++

Ecco degli esercizi semplici con soluzione per praticare la connessione a un database MongoDB in C++ utilizzando diverse librerie.

Esercizio 1: Connessione a MongoDB usando la libreria mongocxx (metodo sequenziale)

Stabilire una connessione a MongoDB e stampare il nome del database.

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

int main() {
    mongocxx::instance inst{};
    mongocxx::client conn{mongocxx::uri{"mongodb://localhost:27017"}};
    auto db = conn["test_db"];
    std::cout << "Connesso al database: " << db.name() << std::endl;
    return 0;
}

Esercizio 2: Connessione a MongoDB usando la libreria mongocxx (OOP)

Creare una classe per gestire la connessione a MongoDB e stampare il nome del database.

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

class MongoDBClient {
private:
    mongocxx::instance inst{};
    mongocxx::client conn{mongocxx::uri{"mongodb://localhost:27017"}};
public:
    MongoDBClient() = default;
    void stampaNomeDatabase(const std::string& db_name) {
        auto db = conn[db_name];
        std::cout << "Connesso al database: " << db.name() << std::endl;
    }
};

int main() {
    MongoDBClient client;
    client.stampaNomeDatabase("test_db");
    return 0;
}

Esercizio 3: Connessione a MongoDB usando la libreria mongo-c-driver (metodo sequenziale)

Stabilire una connessione a MongoDB e stampare il nome del database usando mongo-c-driver.

#include <mongoc/mongoc.h>
#include <iostream>

int main() {
    mongoc_init();

    mongoc_client_t *client = mongoc_client_new("mongodb://localhost:27017");
    mongoc_database_t *database = mongoc_client_get_database(client, "test_db");

    std::cout << "Connesso al database: " << mongoc_database_get_name(database) << std::endl;

    mongoc_database_destroy(database);
    mongoc_client_destroy(client);
    mongoc_cleanup();

    return 0;
}

Esercizio 4: Connessione a MongoDB usando la libreria mongo-c-driver (OOP)

Creare una classe per gestire la connessione a MongoDB e stampare il nome del database usando mongo-c-driver.

#include <mongoc/mongoc.h>
#include <iostream>

class MongoDBClient {
private:
    mongoc_client_t *client;
public:
    MongoDBClient(const std::string& uri) {
        mongoc_init();
        client = mongoc_client_new(uri.c_str());
    }

    ~MongoDBClient() {
        mongoc_client_destroy(client);
        mongoc_cleanup();
    }

    void stampaNomeDatabase(const std::string& db_name) {
        mongoc_database_t *database = mongoc_client_get_database(client, db_name.c_str());
        std::cout << "Connesso al database: " << mongoc_database_get_name(database) << std::endl;
        mongoc_database_destroy(database);
    }
};

int main() {
    MongoDBClient client("mongodb://localhost:27017");
    client.stampaNomeDatabase("test_db");
    return 0;
}

Esercizio 5: Connessione a MongoDB usando la libreria poco-mongo (metodo sequenziale)

Stabilire una connessione a MongoDB e stampare il nome del database usando poco-mongo.

#include <Poco/MongoDB/Client.h>
#include <iostream>

int main() {
    Poco::MongoDB::Client client("localhost", 27017);
    auto db = client.connect("test_db");

    std::cout << "Connesso al database: test_db" << std::endl;

    return 0;
}

Esercizio 6: Connessione a MongoDB usando la libreria poco-mongo (OOP)

Creare una classe per gestire la connessione a MongoDB e stampare il nome del database usando poco-mongo.

#include <Poco/MongoDB/Client.h>
#include <iostream>

class MongoDBClient {
private:
    Poco::MongoDB::Client client;
public:
    MongoDBClient(const std::string& host, int port) : client(host, port) {}

    void stampaNomeDatabase(const std::string& db_name) {
        auto db = client.connect(db_name);
        std::cout << "Connesso al database: " << db_name << std::endl;
    }
};

int main() {
    MongoDBClient client("localhost", 27017);
    client.stampaNomeDatabase("test_db");
    return 0;
}