CRUD operation with Mongoose

 

 

 

CRUD operation with Mongoose

This blog we have seen mongodb basic and how is it work with installation and after installation, we have already seen mongodb basic, CRUD operation, connect mongodb with nodejs, read, update, delete, POST, GET API etc. 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

• # What is Mongoose
• # Install Mongoose
  
• # Create Record
  
• # Update Record
  
• # Delete Records 

 

Now in this blog  we will use mongoose. There is an npm package to connect nodes to mongodb. Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. They created mongoose by improving mongodb, with the help of which you can create schemas and models of mongoose's movements.

Suppose that there are 4 fields in our database (like name, brand, price, category) and the user wants to add a 5th field also (like color) but we want to add only 4 fields, for this we create schemas.

Here you can also define TYPE in schemas like price type is numeric but if any user wants to use quotes (" " ' ') then we can stop the user for this.

in sort we can apply validation in mongoose but we can't in directly mongodb.

 

 

 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.

Install Mongoose

For this you need to copy this (npm i mongoose) and paste it in project's terminal.

https://www.npmjs.com/package/mongoose

 

 

Create Record

Here we now are ready to implement schemas for validate extra field when user wants to enter extra field. Even first we create a record.

const mongoose = require('mongoose');


const saveInDB = async () => {
      await mongoose.connect("mongodb://127.0.0.1:27017/e-comm");

      const ProductSchemas = new mongoose.Schema({
        name: String,

      });

       
      const ProductModel = mongoose.model('products', ProductSchemas );
      let data = new ProductModel({
        name: "Atul"
      });
    
      let result = await data.save();
      console.log(result)

}

saveInDB()

Run with nodemon (we are already installed nodemon). By default index.js file.

Update Record

Now we are ready to update the data in Database.

  const UpdateInDB = async () => {
      const Product = mongoose.model('products', ProductScheme);
      let data = await Product.updateOne(
         {name: "Atul"},
         {
            $set : {price: 41529}
         }
      )
      console.log("updated" , data)
   }
   
UpdateInDB()   
   

Run with nodemon (by default index.js run when you run command nodemon)

Delete Records

Now with the help of deleteOne({}) we can delete the one record.

 

Read Data

const ReadInDB = async () => {
  const Product = mongoose.model('product', ProductScheme);
  let data = await Product.find({name: 'oppo m40'
     
  })
  console.log("Read from database", data)
}

ReadInDB()

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