mongo.txt

mongoDB is a database which does not use any set schema, that is, data is not stored in row column
fashion, but in a json file with hierarcies present in it 


to install it first 
    brew install mongo-community@8.0

to install the latest mongoDB server code, this will install an executable, which has to
code to start the local mongoDB server

now to operate the server, we need a client and that is the mongosh client, which can be installed
using 
    brew install mongosh

and now to open mongoDB server each time, we can write the command
    mongod --config /opt/homebrew/etc/mongod.conf

(these are all local to my machine)

to let the server open each time the system boots, write
    brew services start mongodb/brew/mongodb-community@8.0

(but lets just start the server manually each time)

then, letting the server run, we open another terminal window, and type in  
    mongosh

to start the mongosh client which directly interacts with the local server which has 
a local address of
    mongodb://localhost:27017

then install mongo compass which is a visual representation of whats happening in the
server and what and how many databases are running in the server

to connect the server to compass, just add the local address of the server to it, and everything
is set

some basic commands to run are
    use name

this will switch to a new db or create one if it does not exist

then when we are in the database, we have to have a collection, and 
that implicitely mentioned by using
    db.collection_name.insertOne({json...})  

this adds a single json entry onto the collection names collection_name. Collection is a 
container or a group of documents within the database. collections are more like folders, 
that group related json-like documents, and its json like, since its actually bson or
binary json. 

so when we do 
        db.collection_name.insertOne({json...})  
    
we insert a document into the collection_name collection, and documents within a collection 
need not follow a certain scheme always, hence mongoDB is a schema-less database

js driver is a module that allows the js code to interact with a specific db, service,
system, and to ensure that a js code can access the mongodb server, we have to run the js
code through node.js and hence we have to install the mongoDB driver for node.js, which can be
done using 
    npm install mongodb