Post API insert data in MongoDB
This blog and in upcoming blog we will see
mongodb basic and how is it work with installation and after
installation we should not face
any problem while making Database, collection(table) and using the data in nodejs even whenever we will make
API. Read data from mongodb in nodejs
-
# Read Data from MongoDB
-
# Make file for db connection
- # Handle Promise
Now in this blog we will consider about mongoDB basic command which we can use
to create Database, collection etc.
What is MongoDB
MongoDB is a popular open-source NoSQL (non-relational) database management system. NoSQL means no structure like it is look like an object while in SQL it is a structure query language like SELECT CustomerName, City FROM Customers; (The SELECT statement is used to select data from a database.) But NoSQL database is useless...NOT completely because of whenever we want add extra column in database then it is possible through NoSQL MongoDB.
MongoDB installation - CLICK HERE
MongoDB Basic Command -
CLICK HERE
About MongoDB vs SQL - CLICK HERE
CRUD in MongoDB - CLICK HERE
Object Like -
{
"_id": {
"$oid": "659ad46e0382148123c82841"
},
"name": "moto G60",
"brand": "motorola",
"price": 16500,
"category": "mobile"
}
MongoDB is a type of database that helps store and manage large amounts
of data in a flexible and scalable way. Unlike SQL, MongoDB doesn't require a
fixed structure for the data, allowing you to store information in a more
versatile format.
- MongoDB is a NoSQL database.
- The data stored in a collection
- Collection don't have row and columns
- Data is stored in the form of object.
Read Data from MongoDB
if you remember, we wrote the code for database connection and data reading in the same file. if you write coding of insert, update, delete in same function and same file then it will be very complex. so that's why we will separate file of mongoDB connection file.
First you need to create folder for mongoDB connection and inside this folder we will create mongodb.js file.
Now we will write code in index.js for importing mongodb client
and some code.
1. Importing MongoDB and Setting Up Connection:
const { MongoClient } = require('mongodb');
const url
= 'mongodb://127.0.0.1:27017';
Here, you are importing the
MongoClient class from the 'mongodb' package, which is the official MongoDB
driver for Node.js. You define the connection URL for your MongoDB server. In
this case, it's mongodb://127.0.0.1:27017, which is the default address and
port for a locally running MongoDB server.
2. Defining Database and Creating a MongoClient:
const databaseName = 'e-comm';
const client = new
MongoClient(url);
You specify the name of the database
you want to connect to (e-comm), and then you create a new instance of the
MongoClient using the provided connection URL.
3. Asynchronous Function to Retrieve Data:
async function dbConnect() {
let result =
await client.connect();
let db = result.db(databaseName);
return db.collection("products")
}
# This function, getData, is marked as async, indicating that it contains asynchronous operations.
# await client.connect();: It connects to the MongoDB server asynchronously and returns a result. This
result is an instance of the MongoClient connected to the MongoDB server.
# let db = result.db(databaseName);: It retrieves the specified database (e-comm in this case) from the
connected MongoClient.
# let collection = db.collection('products');: It gets a reference to the 'products' collection within the 'e-comm'
database.
4. exports the dbConnect:
module.exports = dbConnect;
The
module concludes by exporting the dbConnect. When executed, it will
connect to the MongoDB server, retrieve data from the 'products' collection,
and log the result to the console.
Whole Code (/mongodb/mongodb)
const { MongoClient } = require('mongodb');
const uri = 'mongodb://127.0.0.1:27017/';
const client = new MongoClient(uri);
const dbName = 'e-comm';
async function dbConnect()
{
//handle promises
let result = await client.connect();
console.log(result)
db = result.db(dbName);
return db.collection("products")
}
module.exports = dbConnect;
Now we will write the code in index.js file for read the data from mongodb.
const dbConnect = require('./mongodb/mongodb')
const main = async () => {
let data = await dbConnect();
data = await data.find({}).toArray();
console.log(data)
}
main();
Here we first import by const dbConnect with require('./mongodb/mongodb') and promises handle with async and await.
If you want more information about async and await -
CLICK HERE
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