Use java to operate MongoDB and java to operate mongodb

Source: Internet
Author: User

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();

  

  

 

 

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