MongoDB Commands Cheat Sheet

Bir zamanlar bir nedenden ötürü İngilizce olarak aldığım notlar:

Basic Commands	Purpose
use db-name;	switches to that db
show dbs;	list all databases that have data in it
db;	prints current database that we are in
show collections;	lists collections inside the database. Must be used on a database. It lists collections inside the database
db.createCollection("STRING")	creates collection to inside the database
db.COLLECTION-NAME.drop();	deletes the collection from database.
db.dropDatabase();	drops the database that we are currently in. (delete database)

Managing Data

Command	Purpose
db.COLLECTION-NAME.insertOne(”JSON FORMAT DATA”);	It inserts a json formatted data to the spesific collection. Data must be formatted as JSON.
db.COLLECTION-NAME.insertMany(”JSON FORMAT DATAS”);	It inserts a json formatted datas to the spesific collection. Data can be passed as Javascript array.
db.COLLECTION-NAME.updateOne({name: “Berk”}, {$set : {rating : 4.6}});	Updates the value. First it finds the object that its data is “Berk” then sets its rating value to 4.6. $set is an operator from mongoDB.
db.COLLECTION-NAME.updateMany({}, {$set: {students: 10000}});	Same logic with updateOne. It updates all objects because we used {} in the first section. It sets students value to 10000 on all objects.
db.COLLECTION-NAME.deleteOne({name: “Berk”});	It finds the object that its name value is Berk and deletes it.

Search Data

Command	Purpose
db.COLLECTION-NAME.find({}, {name:1, rating:1})	With that usage we can search data inside our documents. It will return only name and rating variables from all of our document. 1 enables, 0 disables it.
db.COLLECTION-name.find({status: “A”});	With that usage we can list objects like their status variable is A. Variable names are example.
db.COLLECTION-NAME.find();	prints datas from spesified collection.
db.COLLECTION-NAME.count();	counts how many documents we have in that collection.
db.COLLECTION-NAME.find({});	with that empty object find function prints us to all documents.
db.COLLECTION-NAME.find({}).skip(1);	it skips the object 1. On JSON format objects are like arrays. Every object has index number.