Basic MongoDB Commands

Starting and Stopping the MongoDB Server

• Starting MongoDB:
  • Windows: Run mongod in Command Prompt. If installed as a service, it might start automatically.
  • macOS/Linux: Run mongod in Terminal.
• Stopping MongoDB:
  • Windows: Press Ctrl+C in the Command Prompt where mongod is running.
  • macOS/Linux: Press Ctrl+C in the Terminal where mongod is running. Alternatively, use sudo systemctl stop mongod for system service.

Basic MongoDB Shell Commands (mongo)

• Connecting to MongoDB Shell:
  • Run mongo in Command Prompt or Terminal to start the MongoDB shell.
• Basic Commands:
  • Show Databases: show dbs
    • Example: > show dbs
  • Use a Database: use <dbName>
    • Example: > use myDatabase
  • Create a Collection: This happens implicitly when inserting documents.
  • Show Collections: show collections
    • Example: > show collections

Insert a Document:

> db.myCollection.insertOne({ name: "John", age: 30 })

Find Documents:

> db.myCollection.find()

Update a Document:

> db.myCollection.updateOne({ name: "John" }, { $set: { age: 31 } })

Delete a Document:

> db.myCollection.deleteOne({ name: "John" })