lp/MongoDB-Cheat-sheet.txt at master · manozkumarj/lp · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
* MongoDB uses 'BSON' to store data in database, BSON - Binary JSON
* We pass JSON data throught query and the driver we use will convert the data from JSON to BSON and give that BSON data to MongoDB server
* MongoDb's default storage engine is "WiredTiger"
* Generally in our backend we will have drivers for different langualges(Nodejs, PHP, Python), these drivers interact with MongoDb server
* MongoDB server will not write the data into files, but talk to storage engine. MongoDb's default storage engine is "WiredTiger".
* MongoDB server gets the query from the driver we use in backend OR from the Shell and forwards that query to storage engine. And storage engine excutes the query
* Aggregation Framework is a powerful way of retrieving the data we want
* Mongo default port is 127.0.0.1:27017
* If we want to start our mongod server in different port
	-> sudo mongod --port 27018
	* Then use the same port to start mongo as below
		-> mongo --port 27018
*


************************************** MongoDB datatypes ******************************************
* ObjectId
* String
* Number
* Boolean
* Array
*


******************************** Commands in CMD prompt in Mongo Shell **********************************
* cls
* show dbs
	-> By default it shows admin, config, local DBs
* use shop
	-> Above command creates 'shop' DB if it's not exist and switched to it to use
* db.products.insertOne({name: "A book", price: 12.99});
* db.products.insertOne({name: "A T-shirt", price: 29.99, description: "Nice T-shirt"});
* db.products.insertOne({name: "A Computer", price: 1229.99, description: "Nice computer", details: {cpu: "intel i7 8770", memory: 32}});
* db.products.find().pretty();

*


************************************ Learning by Max Udemy course **************************************
*