mongodb tutorial

MongoDB is an open source, high-performance, open source NoSQL database.

Compared to relational DBMS, Mongodb is quite different. In MongoDB you store JSON-like documents with dynamic schemas.


Install mongodb depending on the OS you are working on.

Here is the link where you can download them

http://www.mongodb.org/display/DOCS/Quickstart

I have Installed mongodb directly from ubuntu software center.

after installation restart the mongo server

> sudo service mongodb start

You may prompted with "start: Job is already running: mongodb". This means mongo server was already running.

run the below command to connect to mongodb

> mongo

MongoDB shell version: 1.8.2
Tue Jul  3 12:41:59 *** warning: spider monkey build without utf8 support.  consider rebuilding with utf8 support
connecting to: test

In the above case mongodb by default connect to test database.

lets now create your first record as below

> db.test.save({a: 1})

The above command will create record in database. To view the record just run the find statement as below

> db.test.find({a: 1})
{ "_id" : ObjectId("4ff29c16ab6b02ddb38d978a"), "a" : 1 }


create second record by adding another column parameter

> db.test.save({b: 1, name: 'uma mahesh'})

to view the record

> db.test.find({b: 1})
{ "_id" : ObjectId("4ff29c41ab6b02ddb38d978b"), "b" : 1, "name" : "uma mahesh" }


to find all the records that were created, just run the below command

> db.test.find()

{ "_id" : ObjectId("4ff29c16ab6b02ddb38d978a"), "a" : 1 }
{ "_id" : ObjectId("4ff29c41ab6b02ddb38d978b"), "b" : 1, "name" : "uma mahesh" }


To view list of all databases in mongodb, run the below command

> show dbs

Thsi will display list of databases as below

admin    (empty)
local    (empty)
test    0.0625GB




Thank You,
Uma Mahesh.