Use java to operate MongoDB and java to operate mongodb

Use java to operate MongoDB and java to operate mongodb

1. Prepare the environment

Download the driver packages supported by mongoDB for Java

Driver Pack: https://github.com/mongodb/mongo-java-driver/downloads

 

2. query all documents in the collection

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");DBCursor dbCursor = collection.find();System.out.println(collection.getCount());while(dbCursor.hasNext()){System.out.println(dbCursor.next());}mongo.close();

3. delete documents from the set

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");BasicDBObject o = new BasicDBObject("_id", new ObjectId("5199ee647d5fc789bc760c07"));collection.remove(o);mongo.close();

4. Insert a document into the collection

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");DBObject c = new BasicDBObject();c.put("name", “jack");c.put("age", 24);collection.insert(c);mongo.close();

5. Update the document in the Set

Mongo mongo = new Mongo("localhost",27017);DB db = mongo.getDB("test");DBCollection collection = db.getCollection("customer");BasicDBObject query = new BasicDBObject("_id",new ObjectId("519e2e393296cf3baccdb10c"));BasicDBObject object = (BasicDBObject) collection.findOne(query);object.put("name", “wangwu");int n = collection.update(query, object).getN();System.out.println(n);mongo.close();