Codebook

Basic syntax of update() method is as follows db.COLLECTION_NAME.update (SELECTIOIN_CRITERIA, UPDATED_DATA)

To insert data into MongoDB collection, you need to use MongoDB's insert() or save()method. Basic syntax of insert() command is as follows: db.COLLECTION_NAME.insert(document) To query data from MongoDB collection, you need to use MongoDB's find() method. Basic syntax of find() method is as follows db.COLLECTION_NAME.find() To display the results in a pretty way, you can use pretty() method. SYNTAX: db.mycol.find().pretty() Apart from find() method there is findOne() method, that reruns only one document.

Basic syntax of drop collection command is as follows db.COLLECTION_NAME.drop()

Basic syntax of createCollection() command is as follows db.createCollection(name, options) option is optional

dropDatabase() command is used to drop a database

Command use database_name is used to create a database. You can use any name for database_name. If you want to show the database you must want to insert atleast one document into it.

Command show dbs used to show all the databases

Command db.stats() gives the detais of the particular database

You can get mongodb commands and descriptions using db.help()

1. *open a cmd *change the directotry as mongodb installation didirectory. eg:- C:\mongodb\bin>mongod 2. *open another cmd *change the directotry as mongodb installation didirectory. eg:- C:\mongodb\bin>mongo Then you can work with the 2nd cmd

*MongoDb is a Nosql database.This is something different from the RDBMS. *Colloction-This is like a table of RDBMS.