BasicDBList dateList = new BasicDBList(); dateList.add("$t"); dateList.add(28800000); DBObject time = new BasicDBObject("$add", dateList); Bson group = Aggregates.group(new Document().append("t", new Document().append("$
原文:http://blog.csdn.net/huxu981598436/article/details/47216493 MongoDb 命令查询所有数据库列表 CODE: > show dbs 如果想查看当前连接在哪个数据库下面,可以直接输入db CODE: > db Admin 想切换到test数据库下面 CODE: > use test switched to db test > db Test 想查看test下有哪些表或者叫collection,可以输入 CODE: &
原文地址:http://www.mkyong.com/mongodb/java-mongodb-hello-world-example/ A simple Java + MongoDB hello world example – how to connect, create database, collection and document, save, update, remove, get and display document (data). Tools and technologies
step1:构造连接Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/db","root","123"); step2:构造语句String sql = "select username,password from t_user where
In this tutorial, we show you how to save an image file into MongoDB, via GridFS API. The GridFS APIs are able to serve other binary files as well, like video and music files. 1. Save image Code snippets to save an image file into MongoDB, under "pho