Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

MongoDB Commands Cheat Sheet for Beginners

DZone's Guide to

MongoDB Commands Cheat Sheet for Beginners

New to MongoDB? Then this command cheat sheet will come in handy. Even if you aren't a Mongo rookie, this sheet may still be useful to you!

· Database Zone ·
Free Resource

New whitepaper: Database DevOps – 6 Tips for Achieving Continuous Delivery. Discover 6 tips for continuous delivery with Database DevOps in this new whitepaper from Redgate. In 9 pages, it covers version control for databases and configurations, branching and testing, automation, using NuGet packages, and advice for how to start a pioneering Database DevOps project. Also includes further research on the industry-wide state of Database DevOps, how application and database development compare, plus practical steps for bringing DevOps to your database. Read it now free.

In this post, you will learn about MongoDB commands, which could get you started and perform minimum database related activities such as create, update, and drop a collection (table). These commands are ideally meant for MongoDB beginners and could be taken as a cheat sheet. You may want to bookmark this page for quick reference.

MongoDB Commands Cheatsheet

The following is the list of the commands:

Start and stop the MongoDB Database:

sudo service mongod start
sudo service mongod stop

Access the MongoDB database using Shell:

mongo --host localhost:27017

Show all databases:

show dbs

Create a database, say, testdb; Switch to the database:

use testdb

Until a collection is created in a database, the database name is not listed as a result of execution of the command, "show dbs."

Add a collection:

db.createCollection("user")

Show all collections in a database; Execute the "use dbname" command to access the database before executing the command given below.

show collections
show tables

The following command also work:

db.getCollectionNames()

Insert a record in the collection; A record is inserted in the collection, "user."

db.user.insert({"name": "Ajitesh Shukla", "location": "hyderabad", "username": "eajitesh"})

Display list of records of a collection; "user" collection is used.

db.user.find()
db.user.find().pretty()

Display a list of records matching with value (s) of specific fields:

db.user.find({"username": "eajitesh"})
db.user.find({"username": "eajitesh", "location": "hyderabad"})

Drop the collection:

db.user.drop()

Create users in the database; The below command creates a user with username as "ajitesh" and having the role such as "readWrite" and "dbAdmin"

db.createUser({"user": "ajitesh", "pwd": "gurukul", "roles": ["readWrite", "dbAdmin"]})

Show users; If executed without selecting a database, it displays all users along with database information.

show users

Login into the database with username and password:

mongo -u USERNAME -p PASSWORD --authenticationDatabase DATABASENAME

For user created in above command, the login command would look like the following:

mongo -u ajitesh -p gurukul --authenticationDatabase testdb

References

MongoDB Shell Quick Reference

Summary

In this post, you learned about the MongoDB cheatsheet commands (especially, helpful for beginners), which could help you quickly get started with MongoDB.

Did you find this article useful? Do you have any questions or suggestions about this article? Leave a comment and ask your questions and I shall do my best to address your queries.

New whitepaper: Database DevOps – 6 Tips for Achieving Continuous Delivery. Discover 6 tips for continuous delivery with Database DevOps in this new whitepaper from Redgate. In 9 pages, it covers version control for databases and configurations, branching and testing, automation, using NuGet packages, and advice for how to start a pioneering Database DevOps project. Also includes further research on the industry-wide state of Database DevOps, how application and database development compare, plus practical steps for bringing DevOps to your database. Read it now free.

Topics:
mongodb ,commands ,cheat sheet ,beginners ,database

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}