MongoDB学习之（三）增删查改详解大数据

// TODO Auto-generated method stub MongoClient mongoClient = new MongoClient("localhost", 27017); //查询表 MongoDatabase mgdb = mongoClient.getDatabase("test"); System.out.println("Connect to database successfully!"); System.out.println("MongoDatabase inof is : "+mgdb.getName()); //表里表里的集合 for (String name : mgdb.listCollectionNames()) { System.out.println("test表里的集合有："+name); //########################### //获得一个集合对象 MongoCollection Document coll = mgdb.getCollection("myTestCollection"); //如果在集合中插入相同的_id，会报错 index: _id_ dup key: { Document document = new Document("_id", 2002).append("title", "MongoDB Insert Demo") .append("description","database") .append("likes", 30) .append("by", "yiibai point") .append("url", "http://www.yiibai.com/mongodb/"); //往集合对插入一体爱记录 coll.insertOne(document); //再插入一条不指定id的，会自动分配一个_id Document document2 = new Document("title", "MongoDB Insert Demo") .append("description","database") .append("likes", 30) .append("by", "yiibai point") .append("url", "http://www.yiibai.com/mongodb/"); coll.insertOne(document2);
List Document documents = new ArrayList Document Document a1 = new Document("title", "2018"); Document a2 = new Document("title", "2019"); documents.add(a1); documents.add(a2); coll.insertMany(documents); System.out.println("Document inserted successfully");