MongoDB Hello World! Example

In this tutorial, let us take a quick look at how to get started with MongoDB with a Hello World! example,

• Make sure MongoDB has been installed on your system, if not follow the article: Installing MongoDB
• Start the mongod server,

  # modgod
  MongoDB starting : pid=5249 port=27017 dbpath=/data/db 64-bit host=b2391b608026
  db version v3.6.8
  waiting for connections on port 27017

• Now start the MongoDB shell using mongo command,

  # mongo
  MongoDB shell version v3.6.8
  connecting to: mongodb://127.0.0.1:27017
  Implicit session: session { "id" : UUID("bc22e919-c624-40bc-9f99-5ce94de57e2c") }
  MongoDB server version: 3.6.8

• Now lets create our first MongoDB Database using command use your-new-db-name,

  # use myMongoDb
  switched to db myMongoDb

• Lets create our first MongoDB document called: messages, and add the "Hello World!" message,

  db.myMongoDb.messages.insert({id:1,"message":"Hello World!"});
  WriteResult({ "nInserted" : 1 })
  

• Lets print our message, by find method,

  > db.myMongoDb.messages.find({id:1});
  { "_id" : ObjectId("6250a4d85a0cb8937f46272f"), "id" : 1, "message" : "Hello World!" }
  > 

Congratulations! You have completed the MongoDB "Hello World!" example!