In this post, you will learn about MongoDB commands which could get you started and perform minimum database related activities such as create, update, drop a collection (table). These commands are ideally meant for MongoDB beginners and could be taken as the 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"})
- Start and stop the MongoDB Database
- 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
Summary
In this post, you learned about the MongoDB cheatsheet commands (especially, helpful for beginners) which could help you quickly get started with MongoDB.
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I found it very helpful. However the differences are not too understandable for me