MongoDB Java Driver

Ref: http://mongodb.github.io/mongo-java-driver/

Features

BSON library - build encoder/decoders

MongoDB Driver - legacy API, new generic MongoCollection interface, cross-driver CRUD specification

MongoDB Async Driver - fast non-blocking IO

Core driver - core library

Quick Start

Install - Maven recommended, see the page. "mongodb-driver" recommended for new projects.

Connection pool :

• MongoClient() - make a connection
  • Single instance represents pool of connections
    • typically just one instance for many threads
    • build a singleton - thread safe
    • if DO create multiple instance, call close() to clean up
    • when instant created, connected
  • MongoClient.getDatabase("dbname") - create if not exist
  • MongoDatabase.getCollection("name") - create if not exist
  • Document
    • create: new Document("name","value").append......
    • insert: collection.insertOne(doc) : _id auto created collection.insertMany(list<Document>)
    • count: collection.count()
    • query:
      • FindIterable collection.find()
        • find() - all docs
        • find(eq("i",71) - filtered
    • update:
      • updateOne, updateMany returns UpdateResult
        • updateOne(eq("i",10), new Document("$set", new Document("i",110)));
        • UpdateResult updateResult = collection.updateMany(lt("i", 100), inc("i", 100));
    • delete:
      • deleteOne()
      • deleteMany()