MongoDB - Connection

Connecting to MongoDB involves establishing a connection between your application and the MongoDB server. The connection is typically established using a MongoDB driver, which is a library or module specific to the programming language you are using. Below are general steps for connecting to MongoDB using various programming languages.

Connection in Node.js (Using mongodb Node.js Driver):

1. Install the MongoDB Driver:

    npm install mongodb
   

2. Create a Connection:

    const { MongoClient } = require('mongodb');
   
   // Connection URI
   const uri = 'mongodb+srv://<username>:<password>@<cluster-address>/test?retryWrites=true&w=majority';
   
   // Create a new MongoClient
   const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });
   
   // Connect to the MongoDB server
   client.connect().then(() => {
       console.log('Connected to MongoDB');
       // Perform operations here
   }).catch(err => console.error(err));
   

Connection in Python (Using pymongo Python Driver):

1. Install the MongoDB Driver:

    pip install pymongo
   

2. Create a Connection:

    from pymongo import MongoClient
   
   # Connection URI
   uri = "mongodb+srv://<username>:<password>@<cluster-address>/test?retryWrites=true&w=majority"
   
   # Create a MongoClient
   client = MongoClient(uri)
   
   # Get a reference to the database
   db = client.test
   

Connection in Java (Using Java Driver):

1. Add Dependency (Maven):

    <dependency>
       <groupId>org.mongodb</groupId>
       <artifactId>mongodb-driver-sync</artifactId>
       <version>4.4.3</version>
   </dependency>
   

2. Create a Connection:

   import com.mongodb.client.MongoClients;
   import com.mongodb.client.MongoClient;
   import com.mongodb.client.MongoDatabase;
   
   // Connection URI
   String uri = "mongodb+srv://<username>:<password>@<cluster-address>/test?retryWrites=true&w=majority";
   
   // Create a MongoClient
   MongoClient mongoClient = MongoClients.create(uri);
   
   // Get a reference to the database
   MongoDatabase database = mongoClient.getDatabase("test");
   

Connection in C# (Using MongoDB.Driver .NET Driver):

1. Add NuGet Package:

    Install-Package MongoDB.Driver
   

2. Create a Connection:

   using MongoDB.Driver;

   // Connection URI
   string uri = "mongodb+srv://<username>:<password>@<cluster-address>/test?retryWrites=true&w=majority";

   // Create a MongoClient
   var client = new MongoClient(uri);

   // Get a reference to the database
   var database = client.GetDatabase("test");
    

Replace <username>, <password>, and <cluster-address> with your MongoDB Atlas cluster's credentials.