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NodeJS – 5. Connect MongoDB

Author: admin - Posted: 05/05/21 - Update: 05/05/21

I. Cấu hình MongoDB

1. Dùng trên Localhost: MongoDB Compass

- Download: https://www.mongodb.com/try
- Vào Onpremises -> MingoDB Community Server -> Download -> Install bình thường
- Để link truy cập Localhost tại file .env

MONGO_LOCALHOST=mongodb://localhost:27017/medihome

2. Tạo Project trên MongoDB

1.1. Tạo Cluster
- Đăng nhập -> Tạo Project (2 bước: Tên Project và add Member)
- Build Cluster
1.2. Connect Cluster
- Cài Network Access: IP được phép truy cập trước (nên chọn 0.0.0.0/0 -> có thể truy cập mọi nơi để tránh phát sinh lỗi)
- Cài tài khoản có quyền truy cập
1.3. Cấu hình
- Để link truy cập MongoDBtại file .env

MONGODB_URI=mongodb+srv://root:[email protected]/test?retryWrites=true

II. Kết nối MongoDB

1. Cấu hình file ./.env

MONGODB_URI=mongodb+srv://user:password@cluster0.bgpn9.mongodb.net/dbname?retryWrites=true&w=majority
MONGO_LOCALHOST=mongodb://localhost:27017/medihome
MONGODB_DB_NAME=medihome

MONGODB_URI=mongodb+srv://user:[email protected]/dbname?retryWrites=true&w=majority

MONGO_LOCALHOST=mongodb://localhost:27017/medihome

MONGODB_DB_NAME=medihome

2. Dùng mongodb

1.1. Cài đặt thư viện:
https://www.npmjs.com/package/mongodb

npm i mongodb

1.2. Tạo file: src/config/database/mongoDB.js

const MongoClient = require('mongodb').MongoClient;
let _mongodb;
let options = { useNewUrlParser: true, useUnifiedTopology: true };

let connect = async (uri, dbname) => {
	try {
		let client = new MongoClient(uri, options);
		let _connection = await client.connect();
		_mongodb = _connection.db(dbname);
        console.log('\x1b[33m' + 'MongoDB connect successfully !!!' + '\x1b[0m');
	} catch (error) {
		console.log('\x1b[33m\x1b[41m' + error + '\x1b[0m');
	}
};

let getDB = () => {
	return _mongodb;
};

module.exports = { getDB, connect };

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

let _mongodb;

let options = { useNewUrlParser: true, useUnifiedTopology: true };

let connect = async (uri, dbname) => {

try {

let client = new MongoClient(uri, options);

let _connection = await client.connect();

_mongodb = _connection.db(dbname);

console.log('\x1b[33m' + 'MongoDB connect successfully !!!' + '\x1b[0m');

} catch (error) {

console.log('\x1b[33m\x1b[41m' + error + '\x1b[0m');

}

};

let getDB = () => {

return _mongodb;

};

module.exports = { getDB, connect };

1.3. Tại file: src/server.js

const uri = process.env.MONGODB_URI || process.env.MONGO_LOCALHOST;
const mongoDB = require('./config/database/mongoDB');
mongoDB.connect(uri, process.env.MONGODB_DB_NAME);

const uri = process.env.MONGODB_URI || process.env.MONGO_LOCALHOST;

const mongoDB = require('./config/database/mongoDB');

mongoDB.connect(uri, process.env.MONGODB_DB_NAME);

1.4. Sử dụng

const mongoDB = require('../../../config/database/mongoDB');
const ObjectId = require('mongodb').ObjectId;

let collection = mongoDB.getDB().collection('phieunhapthuocs');
collection.insertOne(req.body, (error, results) => {
	if (error) throw error;
	console.log('Insert One, Have Done !!!');
});

const mongoDB = require('../../../config/database/mongoDB');

const ObjectId = require('mongodb').ObjectId;

let collection = mongoDB.getDB().collection('phieunhapthuocs');

collection.insertOne(req.body, (error, results) => {

if (error) throw error;

console.log('Insert One, Have Done !!!');

});

3. Dùng mongoose

2.1. Cài đặt thư viện:
-- Github: https://github.com/Automattic/mongoose

npm install mongoose

3.2. Tạo file: src/config/database/mongo.js

const mongoose = require('mongoose');

connect = (uri) => {
    let options = {
        useNewUrlParser: true,
        useUnifiedTopology: true,
        useCreateIndex: true,
        useFindAndModify: false,
    }
    mongoose.connect(uri, options)
        .then(() => console.log('Connect successfully !!!'))
        .catch((error) => console.log('Connect failure !!!'))
}

module.exports = { connect };

const mongoose = require('mongoose');

connect = (uri) => {

let options = {

useNewUrlParser: true,

useUnifiedTopology: true,

useCreateIndex: true,

useFindAndModify: false,

}

mongoose.connect(uri, options)

.then(() => console.log('Connect successfully !!!'))

.catch((error) => console.log('Connect failure !!!'))

}

module.exports = { connect };

3.3. Tại file: src/server.js

const uri = process.env.MONGODB_URI || process.env.MONGO_LOCALHOST;
const mongo = require('./config/database/mongo');
mongo.connect(uri);

const uri = process.env.MONGODB_URI || process.env.MONGO_LOCALHOST;

const mongo = require('./config/database/mongo');

mongo.connect(uri);

3.4. Sử dụng

const mongoDB = require('../../../config/database/mongoDB');

mongoDB.getDB().collection('users').find({}, function (error, result) {
	if (error) throw error;
	result.toArray(function (err, list) {
		console.log(list[0]);
	});
});

const mongoDB = require('../../../config/database/mongoDB');

mongoDB.getDB().collection('users').find({}, function (error, result) {

if (error) throw error;

result.toArray(function (err, list) {

console.log(list[0]);

});