In this post, we will see a comprehensive list of all the MongoDB commands you will ever need as a MongoDB beginner. This list covers almost all the most used commands in MongoDB.
I will assume that you are working inside a collection named 'comments' on a MongoDB database of your choice.
1. Database Commands
View all databases
show dbs
Create a new or switch databases
use dbName
View current Database
db
Delete Database
db.dropDatabase()
2. Collection Commands
Show Collections
show collections
Create a collection named 'comments'
db.createCollection('comments')
Drop a collection named 'comments'
db.comments.drop()
3. Row(Document) Commands
Show all Rows in a Collection
db.comments.find()
Show all Rows in a Collection (Prettified)
db.comments.find().pretty()
Find the first row matching the object
db.comments.findOne({name: 'Harry'})
Insert One Row
db.comments.insert({
'name': 'Harry',
'lang': 'JavaScript',
'member_since': 5
})
Insert many Rows
db.comments.insertMany([{
'name': 'Harry',
'lang': 'JavaScript',
'member_since': 5
},
{'name': 'Rohan',
'lang': 'Python',
'member_since': 3
},
{'name': 'Lovish',
'lang': 'Java',
'member_since': 4
}])
Search in a MongoDb Database
db.comments.find({lang:'Python'})
Limit the number of rows in output
db.comments.find().limit(2)
Count the number of rows in the output
db.comments.find().count()
Update a row
db.comments.updateOne({name: 'Shubham'},
{$set: {'name': 'Harry',
'lang': 'JavaScript',
'member_since': 51
}}, {upsert: true})
Mongodb Increment Operator
db.comments.update({name: 'Rohan'},
{$inc:{
member_since: 2
}})
Mongodb Rename Operator
db.comments.update({name: 'Rohan'},
{$rename:{
member_since: 'member'
}})
Delete Row
db.comments.remove({name: 'Harry'})
Less than/Greater than/ Less than or Eq/Greater than or Eq
db.comments.find({member_since: {$lt: 90}})
db.comments.find({member_since: {$lte: 90}})
db.comments.find({member_since: {$gt: 90}})
db.comments.find({member_since: {$gte: 90}})