MongoDB: A Flexible and Scalable NoSQL Database
MongoDB is a popular NoSQL database that provides a flexible and scalable solution for storing and managing data. Unlike traditional relational databases, MongoDB stores data in flexible, JSON-like documents, allowing developers to easily change the structure of their data without the need for costly migrations.
Commands
Database Commands:
1) View all databases
show dbs
2) Create a new database or switch it
use dbName
3) View the current Database
db
4) Delete the Database
db.dropDatabase()
Collection Commands:
1) Show Collections
show collections
2) Create a collection named 'hashnode'
db.createCollection('hashnode')
3) Drop a collection named 'hashnode'
db.hashnode.drop()
Row Commands:
1) Show all Rows in a Collection
db.hashnode.find()
2) Show all Rows in a Collection (Prettified)
db.hashnode.find().pretty()
3) Getting the first row to match the object
db.hashnode.findOne({name: 'Suraj'})
4) Inserting a Single Row
db.hashnode.insert({
'name': 'SURAJ',
'lang': 'JavaScript',
'age': 20
})
5) Inserting Many Rows
db.hashnode.insertMany([{
'name': 'SURAJ',
'lang': 'JavaScript',
'member_since': 20
},
{'name': 'RYAN',
'lang': 'Python',
'age': 30
},
{'name': 'Lasya',
'lang': 'React',
'age': 24
}])
6) Search in a MongoDB Database
db.hashnode.find({lang:'Python'})
7) Limit the number of Rows in the output
db.hashnode.find().limit(1)
8) Count the number of Rows in the output
db.hashnode.find().count()
9) Update a Row
db.hashnode.updateOne({name: 'Shubham'},
{$set: {'name': 'SURAJ',
'lang': 'JavaScript',
'age': 19
}}, {upsert: true})
10) Delete a Row
db.hashnode.remove({name: 'RYAN'})
Operator Commands:
1) Increment Operator
db.hashnode.update({name: 'RYAN'},
{$inc:{
age: 23
}})
2) Rename Operator
db.hashnode.update({name: 'RYAN'},
{$rename:{
age: 'age_value'
}})
3) Less than/Greater than/ Less than or Equal to/Greater than or Equal to
db.hashnode.find({age: {$lt: 30}})
db.hashnode.find({age: {$lte: 30}})
db.hashnode.find({age: {$gt: 30}})
db.hashnode.find({age: {$gte: 30}})
Conclusion
In conclusion, this MongoDB commands cheat sheet can be a handy resource for developers and database administrators who work with MongoDB. By memorizing or referencing these commands, you can more efficiently perform common tasks such as querying, inserting, updating, and deleting data in your MongoDB databases.
With this cheat sheet, you can quickly access and recall the MongoDB commands you need to work efficiently with your databases. However, always refer to the official MongoDB documentation for more in-depth information and best practices.
Until Next Time...
