mongodb return specific fields

Directory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations) Library operations Insert Inquire Modify Delete

By default, queries in MongoDB return all fields in matching documents. To limit the amount of data from MongoDB sends to applications, you can include a projection document in the Quer Y operation.Projection DocumentThe projection document limits

Original link http://www.cnblogs.com/zhangzili/p/4975080.htmlMongoDB knowledge points at a glance1. Start the MongoDB database:Go to the MongoDB installation directory and execute the following commandC:\Program

Directory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations) Library operations Insert Inquire Modify Delete

Use MongoDB in Python applications and mongodb in python applications Python is a powerful programming language used in many different types of applications in the development community. Many people know that it is a flexible language that can

Original address: http://www.cnblogs.com/zhongweiv/p/node_mongodb.htmlDirectory Brief introduction MongoDB installation (Windows) Getting Started with MongoDB basic syntax and operations (Mongo.exe client operations)

Plan: Install a virtual machine, Ubuntu bar, 14.04 trusty Tahr. Install MongoDB network resources:Http://mirrors.aliyun.com/ubuntu-releases/14.04/ubuntu-14.04-server-amd64.iso.torrent (Public

This article mainly introduces the PHP operation MongoDB implementation of adding and removing functions, combined with examples of the form of a summary of the PHP operation MongoDB Common skills, and with PHP7 operation MongoDB method, with a

This is a creation in Article, where the information may have evolved or changed. Originally from: http://docs.mongodb.org/manual/release-notes/3.0/ March 3, 2015 MongoDB 3.0 is now available for use. Key new features include support for the

0) MONGO: Connect MongoDB database via client1) Show DBS---Display the currently created database2) Use test---Create or switch databases3) Db.dropdatabase ()--Delete the current database3) Show Collections: Displays the collection created by the