Hello Friends,
In this post, I will show how to use Basic Commands of MongoDB.
What is MongoDB ?
MongoDB is a source-available cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License which is deemed non-free by several distributions.
What is MongoDB Compass
MongoDB Compass is a powerful GUI for querying, aggregating, and analyzing your MongoDB data in a visual environment. Compass is free to use and source available, and can be run on macOS, Windows, and Linux.
We will use the following commands in MongoDB Compass.
Create database
use courses
Show all databases
show dbs
Delete the database
db.dropDatabase()
Show all the collections in current db
show collections
Create a new collection
db.createCollection("<collection_name>")
Delete a collection
db.courses.drop()
Insert A Row in collection
db.courses.insertOne({"course": "MCA", "college": "MBM"})
Insert many rows in collection (table)
db.courses.insertMany([{"course": "BSC", "college": "SBK"}, {"course": "BCA", "college": "JNVU"}])
Get all the rows from collection
db.courses.find()
Searching specific rows in collection
db.courses.find({"courses": "MCA"})
Get the number of rows in collection
db.courses.find().size()
Get limited records from collection
db.courses.find().limit(2)
Ascending / Descending sorting
db.courses.find().sort({"course": 1}) // Ascending order
db.courses.find().sort({"course": -1}) // Descending order
Get only one record
db.courses.findOne({"course": "MCA"})
Update only one record in collection
db.courses.updateOne({"course": "MCA"}, {$set: {"course": "MBA"}})
Update Multiple records in collection
db.courses.updateMany({"course": "MCA"}, {$set: {"course": "MBA", "college": "JNVU"}})
Delete a record
db.courses.deleteOne({"course": "MCA"})
Delete multiple records
db.courses.deleteMany({"course": "MCA", "course": "MBM"})
| Commands | Explanation |
|---|---|
| use courses | Create a Database |
| show dbs | Show all database |
| db.dropDatabase() | Delete Database |
| show collections | Show the collections in DB |
| db.createCollection("") | Create a collection |
| db.courses.drop() | Delete a collection |
| db.courses.insertOne({"course": "MCA", "college": "MBM"}) | Insert a row in collection |
| db.courses.insertMany([{"course": "BSC", "college": "SBK"}, {"course": "BCA", "college": "JNVU"}]) | Insert many rows |
| db.courses.find() | Fetch all rows |
| db.courses.find({"courses": "MCA"}) | Fetch specific row |
| db.courses.find().size() | Number of rows in the collection |
| db.courses.find().limit(2) | Fetch Limited rows |
| db.courses.find().sort({"course": 1}) | Ascending order |
| db.courses.find().sort({"course": -1}) | Descending order |
| db.courses.findOne({"course": "MCA"}) | Get only one record |
| db.courses.updateOne({"course": "MCA"}, {$set: {"course": "MBA"}}) | Update only one record in collection |
| db.courses.updateMany({"course": "MCA"}, {$set: {"course": "MBA", "college": "JNVU"}}) | Update multiple records in collection |
| db.courses.deleteOne({"course": "MCA"}) | Delete a specific record |
| db.courses.deleteMany({"course": "MCA", "course": "MBM"}) | Delete multiple records |
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