MongoDB: Basic Shell and CRUD

README.md

MongoDB

📝 Documentation

💡 Reference

🔠 Glossary

Use Mongo Shell

mongosh

Basic Commands

# show databases
show dbs

# to switch databases
use <db>

# display the current database
db

# show collections
show collections

MongoDB CRUD Operations

CRUD operations create, read, update, and delete documents.

Create Operations

Create or insert operations add new documents to a collection. If the collection does not currently exist, insert operations will create the collection.

# inserts a new document into a collection
db.collection.insertOne(<document>)

# inserts several new documents into a collection
db.collection.insertMany([ <document 1> , <document 2>, ... ])

Read Operations

Query a collection for documents.

# performs a query on a collection or a view and returns a cursor object
db.collection.find(query, projection)

Parameter	Type	Description
query	document	Optional. Specifies selection filter using query operators.
projection	document	Optional. Specifies the fields to return in the documents that match the query filter.

Update Operations

Modify existing documents in a collection.

# modifies a single document in a collection
db.collection.updateOne(<filter>, <update>, options)

# modifies multiple documents in a collection
db.collection.updateMany(<filter>, <update>, options)

# replaces a single document in a collection
db.collection.replaceOne(<filter>, <replacement>, options)

Parameter	Type	Description
filter	document	The selection criteria for the update. The same query selectors as in the find() method are available.
update	document or pipeline	The modifications to apply.
replacement	document	The replacement document.

Delete Operations

Remove documents from a collection.

# deletes a single document in a collection
db.collection.deleteOne(<filter>)

# deletes multiple documents in a collection
db.collection.deleteMany(<filter>)

Parameter	Type	Description
filter	document	Specifies deletion criteria using query operators.

docker-compose.yml

version: '3.9'
services:
  mongo:
    image: mongo:latest
    container_name: mongodb
    ports:
      - 27017:27017

package.json

{
  "name": "mongo-gist",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "compose:up": "docker-compose up --force-recreate -d",
    "compose:down": "docker-compose down -v --remove-orphans -t 0",
    "mongosh": "docker exec -it mongodb mongosh",
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}