How to use MongoDB to develop a simple e-commerce website

As a popular non-relational database, MongoDB plays a great role in the development of e-commerce websites. Advantage. Its scalability and flexibility make it ideal for building powerful and easily scalable e-commerce websites. This article will introduce you to how to use MongoDB to develop a simple e-commerce website and provide specific code examples.

First, we need to install and configure MongoDB. You can download and install the version suitable for your operating system from MongoDB's official website (https://www.mongodb.com/). After the installation is complete, you need to start the MongoDB server. Enter the command mongod on the command line to start MongoDB.

Next, we need to create a database to store the data for our e-commerce website. Enter the command mongo at the command line to open the MongoDB console, and then enter the following command to create a database named "ecommerce":

use ecommerce

Next, we need to create the collection (similar to tables in relational databases) to store different types of data. For example, we can create a collection named "products" to store product information. You can create this collection using the following command:

db.createCollection("products")

We can then insert some sample data into the "products" collection:

db.products.insertOne({ name: "手機(jī)", price: 999, quantity: 10 })
db.products.insertOne({ name: "電視", price: 1999, quantity: 5 })

Now, we have completed the basic setup of MongoDB. Next, we'll use Node.js and Express.js to create a simple server and MongoDB to store and retrieve data.

First, we need to install Node.js and Express.js. You can download and install the Node.js version suitable for your operating system from the official website (https://nodejs.org/). Then, enter the following command at the command line to install Express.js:

npm install express

Create a new folder to hold the code for our e-commerce website. In the folder, create a file named "server.js" and enter the following code:

const express = require("express");
const app = express();
const PORT = 3000;

app.get("/", (req, res) => {
  res.send("歡迎訪問電子商務(wù)網(wǎng)站");
});

app.listen(PORT, () => {
  console.log(`服務(wù)器已啟動(dòng)，端口號(hào)：${PORT}`);
});

The above code creates a simple Express.js server listening on port number 3000. When accessing the root path "/", the server will return "Welcome to the e-commerce website".

Next, we need to use MongoDB to store and retrieve data. In the "server.js" file, add the following code:

const MongoClient = require("mongodb").MongoClient;

const url = "mongodb://localhost:27017";
const dbName = "ecommerce";

MongoClient.connect(url, (err, client) => {
  if (err) {
    console.log("數(shù)據(jù)庫連接失敗");
  } else {
    console.log("數(shù)據(jù)庫連接成功");

    const db = client.db(dbName);
    const productsCollection = db.collection("products");

    app.get("/products", (req, res) => {
      productsCollection.find().toArray((err, result) => {
        if (err) {
          res.send("獲取商品信息失敗");
        } else {
          res.send(result);
        }
      });
    });

    app.listen(PORT, () => {
      console.log(`服務(wù)器已啟動(dòng)，端口號(hào)：${PORT}`);
    });
  }
});

The above code connects to the MongoDB database and creates a collection named "productsCollection" to store product information. When accessing the path "/products", the server will return all product information.

So far, we have completed the development of a simple e-commerce website. You can view the welcome page by visiting "http://localhost:3000" and obtain all product information by visiting "http://localhost:3000/products".

To summarize, developing a simple e-commerce website using MongoDB is relatively simple. You only need to install and configure MongoDB, create databases and collections to store data, and then use Node.js and Express.js to create servers and use MongoDB for data storage and retrieval. The above example code is just a simple starting point that you can further extend and optimize according to your own needs. I wish you success in developing an e-commerce website with MongoDB!

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