Use of mongodb

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Preface

MongoDB It's open source 、 High performance 、 A modeless document database , yes NoSQL One of the database products . Its emergence mainly responds to “ Three tenors ” Other questions , It can solve the problem that a large amount of data needs to be stored 、 High concurrent read and write 、 The reality of high availability , For social circles of friends 、 Game points 、 Logistics trajectory 、 Commodity reviews and other businesses . Low architecture cost , Excellent in all aspects .

MongoDB And MySql Compare

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Basic use command

1. Create database

use Database name Such as ：use articledb

2. View all databases that you have permission to view

show dbs

3. Delete database

db.dropDatabase()

4. Create set

db.createCollection("name") ; name: The name of the set created

5. View the tables in the current library

show collections or show tables

6. Delete the collection

db. Collection name .drop() If the deletion is successful, it will return true

4. Document insertion

Insert a single document ：db.collection.insertOne( <document>, { writeConcern: <document> } )

Insert multiple documents ：db.collection.insertMany( [<document 1>, <document 2>, ....] { writeConcern: <document> ordered: <boolean> } )

4. View the inserted document

db. Collection name .find() Such as ： db.col.find()

Two 、 Operation details