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MongoDB

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After download then go to the installation directory of MongoDB and run a file named "mongod" with administrator priveleges. Then run "Mongo.exe" I have already downloaded and installed..

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1) If you want to use a database with name mydb, then use DATABASE statement would be as follows −

use mydb

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To check your currently selected database, use the command

db

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If you want to check your databases list, use the command show dbs.

show dbs

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Your created database (mydb) is not present in list. To display database, you need to insert at least one document into it.

db.movie.insert({"name":"Trojan AnuragK19"})

show dbs

 

3) Create collection in MongoDB.

db.createCollection("mycollection")

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4) Inserting into collection.

db.mycollection.insert([{'name':'Anurag Kurmi','age':21}])

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Multiple values insertion

var cs=[{'name':'Anuj Kurmi','age':18},

{'name':'Rahul Kumar','age':25},

{'name':'John Nadar','age':30}]

db.mycollection.insert(cs)

 

5) MongoDB Query Document

db.mycollection.find()

db.mycollection.find().pretty()

....(json format)

 

6) MongoDB update document

db.mycollection.update({'name':'Rahul Kumar'},{$set:{'name':'Amit Patel'}})

db.mycollection.find()

 

7) Delete Document in MongoDB

db.mycollection.remove({'name':'Amit Patel'})

db.mycollection.find()

 

8) limit() and skip() method in MongoDB.

db.mycollection.find({},{"name":1,_id:0}).limit(1)

 

9) Sorting of documents in MongoDB.

db.mycollection.find({},{"age":1,_id:0}).sort({"age":-1})

 

10) MongoDB Indexing.

db.mycollection.ensureIndex({"name":1})

 

11) MongoDB projection.

db.mycollection.find({},{"name":1,_id:0})

db.mycollection.find({},{"name":1,_id:0}).limit(1).skip(1)

 

12) Dropping a collection in MongoDB.

db.mycollection.drop()

 

2) Dropping a database in MongoDB.

db.dropDatabase()

 

 

Thats it for this video thanks for watching document subscribe and comment...