Command MongoDb

Command MongoDb :

	- show dbs : list all databases

	- use <db_name> : switch to <db_name>

	- show collections : list all tables in the current selected database

	- insert a record :
		- db.<table_name>.save({username:"google", password:"google123"})

	- find all in a table :
		- db.<table_name>.find()

	- update a record :
		- db.<table_name>.update({username:"mkyong"},{$set:{password:"hello123"}})

	- find by a attribute :
		- db.<table_name>.find({username:"google"})

	- find records where length attribute name is less than or equal to 2
		- db.<table_name>.find({$where:"this.<attribute_name>.length<=2"})

	- query like :
		- db.<table_name>.find({"<attribute_name>": /.*<value>.*/})
					    or
		- db.<table_name>.find({"<attribute_name>": /<value>/})

	- query sorting :
		- db.<table_name>.find().sort({<attribute_nname> : <1 (ascending) or -1 (descending)>})