Mastering MongoDB: A Guide to Commonly Used Commands

 

Commonly used MongoDB commands

 

Database Management

• Create a database : use <database_name>
• Show the current database : db
• Show all databases : show dbs
• Drop a database : db.dropDatabase()

 

Collection Management

• Create a collection : db.createCollection("<collection_name>")
• Show all collections : show collections
• Drop a collection : db.<collection_name>.drop()

 

Document Management

• Insert a document :
  db.<collection_name>.insertOne(<document>)
  or
  db.<collection_name>.insertMany(<documents>)
  
  
• Find documents :
  db.<collection_name>.find() or db.<collection_name>.findOne(<query>)
  
  
• Update a document :
  db.<collection_name>.updateOne(<query>, <update>)
  or
  db.<collection_name>.updateMany(<query>, <update>)
  
  
• Delete a document :
  db.<collection_name>.deleteOne(<query>)
  or
  db.<collection_name>.deleteMany(<query>)

 

Query Operators

• $eq : Matches values that are equal to a specified value.
• $ne : Matches values that are not equal to a specified value.
• $gt : Matches values that are greater than a specified value.
• $lt : Matches values that are less than a specified value.
• $gte : Matches values that are greater than or equal to a specified value.
• $lte : Matches values that are less than or equal to a specified value.
• $in : Matches any of the values specified in an array.
• $nin : Matches none of the values specified in an array.
• $and : Joins query clauses with a logical AND and returns all documents that match the conditions.
• $or : Joins query clauses with a logical OR and returns all documents that match the conditions.

MongoDB Documentation: https://docs.mongodb.com/

MongoDB Documentation

The documentation provides comprehensive information on various topics, including installation, getting started, CRUD operations, aggregation, indexes, security, and more.