u011868279的博客

Why are developers interested in MongoDB?MongoDB is a database management system designed to rapidly develop web applications and internet infrastructure.MongoDB's document format is based on JSON,a popular schema for storing arbitrary data structures.

[root@iZbp1ehco2fi1l7bj6hhphZ ~]# gem install mongoFetching: bson-4.12.1.gem (100%)Building native extensions. This could take a while...ERROR: Error installing mongo: ERROR: Failed to build gem native extension. current directory: /usr/loc...

What is MongoDB?Database solutionHow is mongoDB different?The Key MongoDB Characteristicslink :MongoDB: the application data platform | MongoDBUseful Articles/Docs: Learn m...

What is MongoDB ? MongoDB is an open-source NoSQL database written in C++ language.It uses JSON-like documents with optional schemas. It provides easy scalability and is a cross-platform,document-oriented database. MongoDB works on the concept of Col..

Describe the newly added features in Java8?The newly added features of Java 8 Feature Name Description Lambda expression A function that can be shared or referred to as an object Functional Interfaces ...

Step 1: 配置安装库[root@iZbp1ehco2fi1l7bj6hhphZ ~]# vi /etc/yum.repos.d/mongodb-org-4.2.repoStep 2: 将需要更新的package更新到源中的最新版。（yum update和yum upgrade的功能都是一样的，都是将需要更新的package更新到源中的最新版。唯一不同的是，yum upgrade会删除旧版本的package，而yum update则会保留(obsoletes=0)。）[root@iZbp1..

Module IntroductionUseful Resources & LinksHelpful Articles/Docs: More Details about Config Files:Configuration File Options — MongoDB Manual More Details about the Shell (mongo)Options: Legacy mongo Shell — MongoDB Manual More...

个人博客，喜欢的可以收藏This chapter covers:Using CRUD Operations in the MongoDB shell Building indexes and using explain() Understanding basic adminstration Getting help2.2.1 Starting the shellstart the MongoDB shell by running the mongo executable:mongo

Chapter 5 IndexesIn this chapter we will cover:What indexes are and why you'd want to use them. How to choose which fields to index How to enforce and evaluate index usage Administrative details on creating and removing indexes.Introduction to Inde

CP3 Creating, Updating, and Deleting DocumentsThis chapter covers the basic of moving data into and out of the database,including the following:Adding new documents to a collection Removing documents from a collection Updating existing documents Cho

Introduction to MongoDB(Part1)

Querying an e-commerce data model The MongoDB query language in detail Query selectors and optionsProducts,categories, and reviews> use productsswitched to db products> show tables;ordersproducts> product = db.products.findOne({"slug" :

Inserting New DocumentsLearn Data ModelingHow does the value fo _id get assigned to a document.it is automatically generated as an ObjectId type value.You can select a non ObjectId type value when inserting a new document, as long as t...

How DoesMongoDB Store Data?What is JSON?JavaScript Object Notation, more commonly known as JSON,was defined as part of the JavaScript language in the early 2000s.JavaScript objects are simple associative containers, wherein a string...

CP1 What is MongoDB?

Schema design Data models for e-commerce Nuts and bolts of databases, collection, and documents.Principles of schema designWhat are your application access pattern? What's the basic unit of data? the basic unit of data is the BSON document What are

　　Introducing the MongoDB API through Ruby Understanding how the drivers work Using the BSON format and MongoDB network protocol

How to fix the ERROR: Failed to build gem native extension in Centos 8

How to install rubygem-mongo on centos8 using dnf

How to Using CRUD operation in the MongoDB shellHow to Building indexes and using explain()How to understand basic administrationHow to getting help

how to install mongodb in centos8