mongodb-driver-examples

MongoDB Driver Examples - TechMart

Native MongoDB Java Driver examples demonstrating core capabilities through the TechMart e-commerce story.

🎯 Overview

This module uses the MongoDB Java Sync Driver directly, giving you full control over how you interact with MongoDB. Perfect for:

• Understanding MongoDB fundamentals
• Performance-critical applications
• When you need maximum flexibility
• Learning before abstracting with frameworks

📋 Examples

#	Example	Key Concepts
Core MongoDB
E01	Document Model	Rich documents, nested structures, arrays
E02	Flexible Schema	Schema evolution, polymorphic documents
E03	CRUD Operations	Insert, find, update, delete patterns
E04	Index Types	Single, compound, text, geo, TTL indexes
E05	Aggregation Framework	Pipelines, $group, $lookup, $facet
E06	Transactions	Multi-document ACID transactions
E07	Change Streams	Real-time data notifications
E08	Materialized Views	$merge, incremental updates
E09	Schema Validation	JSON Schema enforcement
Time Series
E10	Time Series Collections	IoT data, TTL, granularity
E11	Window Functions	Moving averages, ranking
Security
E12	Queryable Encryption	Client-side encryption concepts
E13	Client-Side FLE	Crypto-shredding for GDPR
Atlas Features
E14	Atlas Search	Full-text, fuzzy, autocomplete
E15	Vector Search	Embeddings, semantic search, RAG
Scaling
E16	Replica Sets	Read preferences, write concerns
E17	Sharding	Shard keys, distribution

🚀 Quick Start

# From this directory
mvn compile

# Load sample data
mvn exec:java -Dexec.mainClass="com.mongodb.examples.common.SampleDataLoader"

# Run any example
mvn exec:java -Dexec.mainClass="com.mongodb.examples.core.E01_DocumentModel"

# List all examples
mvn exec:java -Dexec.mainClass="com.mongodb.examples.TechMartRunner" -Dexec.args="list"

🔧 Configuration

export MONGODB_URI="mongodb://localhost:27017"
export MONGODB_DATABASE="techmart"

📁 Project Structure

mongodb-driver-examples/
├── pom.xml
└── src/main/java/com/mongodb/examples/
    ├── common/
    │   ├── MongoClientManager.java
    │   └── SampleDataLoader.java
    ├── core/
    │   ├── E01_DocumentModel.java
    │   ├── E02_FlexibleSchema.java
    │   └── ...
    ├── timeseries/
    ├── security/
    ├── atlas/
    └── scaling/

📖 Key APIs Demonstrated

// Connection
MongoClient client = MongoClients.create(connectionString);
MongoDatabase db = client.getDatabase("techmart");
MongoCollection<Document> coll = db.getCollection("products");

// CRUD
coll.insertOne(document);
coll.find(Filters.eq("category", "Electronics"));
coll.updateOne(filter, Updates.set("price", 999));
coll.deleteOne(filter);

// Aggregation
coll.aggregate(Arrays.asList(
    Aggregates.match(filter),
    Aggregates.group("$category", Accumulators.sum("total", "$amount")),
    Aggregates.sort(Sorts.descending("total"))
));

// Transactions
try (ClientSession session = client.startSession()) {
    session.startTransaction();
    collection1.updateOne(session, filter, update);
    collection2.insertOne(session, document);
    session.commitTransaction();
}

📚 Resources

• MongoDB Java Driver Docs
• API Reference