MongoDB Shell

 •An interactive JavaScript interface to MongoDB 

 •Used for –

 •add new data 

 •query the existing data

 •update the existing data  

•remove the data  

•perform administrative operations 

•Separate Installation 

•Can be installed on the same location as the server binary

MongoDB Shell 

•Connect local 

MongoDB instanceon default portmongosh 

•Connect local MongoDB instance on different port

 mongosh--port 8883 

•Connect Remote MongoDB instance

 mongosh--host mongodb0.example.com --port 8883

 Connect MongoDB instance with Authentication 

mongosh--host mongodb0.examples.com --port 28015 --username alice--password --authenticationDatabaseadmi

Configuring MongoDB Shell 

Display Number of Operations 

•Setup mongo shell prompt to display number of operations issued in the current session 

•Code: 

     cmdCount= 1;

       prompt = function() {

        return (cmdCount++) + "> "

   ;} 

•Result1>2>3> 

 Display Database and Hostname

Setup mongo shell prompt in the form of <database>@<hostname>$

•Code 

host = db.serverStatus().host;

 prompt = function() 

    { 

     return db+"@"+host+"$ "; 

  }

•Result 

  test@myHost1$ 

Display Up Time and Document Count 

•Setup mongo shell prompt that contains the system up time and the number of documents in the current database

 •Codeprompt = function() {return "Uptime:"+db.serverStatus().uptime+" Documents:"+db.stats().objects+" > ";} 

•Result 

•Uptime:5897 Documents:6 > 

Accessing mongo Shell Help 

•Command-line help 

•Shell help

•Database help 

•Collection help

•Curson help 

•Wrapper Object help

 

Data Types in the mongo Shell

 Date 

  •Date() 

  •new Date() 

  •ISODate()

 

 •ObjectId

 •new ObjectId 

 

•NumberLong 

•NumberLong("2090845886852")

•NumberInt 

•NumberLong("2090845“)

 

•NumberDecimal

•NumberDecimal("1000.55") or NumberDecimal(1000.55)