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();