Using the MongoDB Java Driver

The MongoDB Java Driver allows Java applications to interact with MongoDB databases. It provides a comprehensive API to perform CRUD operations, manage connections, and utilize MongoDB features efficiently.

To use the MongoDB Java Driver, you need to include it in your project. If you are using Maven, add the following dependency to your pom.xml:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-sync</artifactId>
    <version>4.9.0</version>
</dependency>

For Gradle, add this line to your build.gradle:

implementation 'org.mongodb:mongodb-driver-sync:4.9.0'

To connect to a MongoDB database, use the following code snippet:

import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;

public class MongoDBConnection {
    public static void main(String[] args) {
        MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
        System.out.println("Connected to MongoDB");
        mongoClient.close();
    }
}

4.1. Creating a Database and Collection

import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoCollection;
import org.bson.Document;

MongoDatabase database = mongoClient.getDatabase("testdb");
MongoCollection collection = database.getCollection("testCollection");
System.out.println("Database and Collection created!");

4.2. Inserting a Document

Document doc = new Document("name", "John Doe")
                                .append("age", 30)
                                .append("city", "New York");
collection.insertOne(doc);
System.out.println("Document inserted!");

4.3. Querying Documents

for (Document document : collection.find()) {
    System.out.println(document.toJson());
}

4.4. Updating a Document

collection.updateOne(eq("name", "John Doe"), 
    new Document("$set", new Document("age", 31)));

4.5. Deleting a Document

collection.deleteOne(eq("name", "John Doe"));

• Always close the MongoClient when done.
• Use connection pooling for better performance.
• Handle exceptions properly to prevent application crashes.
• Index your collections for faster queries.
• Use BSON to handle complex data types effectively.