Installation & Setup

Run MongoDB Server: Mac & Linux

Example: /Users/ashirali-mg/Programs/mongodb-6.0.2/bin/mongod --dbpath=/Users/ashirali-mg/Documents/mongodb-data

mongod-filepath --dbpath=db-folder

MongoDB Admin

Robo 3T

Quick Start

This guide shows you how to create an application that uses the MongoDB Node.js driver to connect to a MongoDB cluster hosted on MongoDB Atlas. If you prefer to connect to MongoDB using a different driver or programming language, see our list of official drivers.

https://www.mongodb.com/docs/drivers/node/current/quick-start/

Install

npm install mongodb

Connect

const { MongoClient } = require("mongodb");
// Connection URI
const uri = "mongodb://localhost:27017";
// Create a new MongoClient
const client = new MongoClient(uri);
async function run() {
  try {
    // Connect the client to the server (optional starting in v4.7)
    await client.connect();
    // Establish and verify connection
    await client.db("admin").command({ ping: 1 });
    console.log("Connected successfully to server");
  } finally {
    // Ensures that the client will close when you finish/error
    await client.close();
  }
}

run().catch(console.dir);

Insert

Single Document

Insert data to a particular collection (tables in NoSQL)

import { MongoClient } = require("mongodb");

const uri = "mongodb://localhost:27017";
const client = new MongoClient(uri);

async function run() {
  try {
    const database = client.db("insertDB");
    const haiku = database.collection("haiku");
    // create a document to insert
    const doc = {
      title: "Record of a Shriveled Datum",
      content: "No bytes, no problem. Just insert a document, in MongoDB",
    }
    const result = await haiku.insertOne(doc);

    console.log(`A document was inserted with the _id: ${result.insertedId}`);
  } finally {
    await client.close();
  }
}
run().catch(console.dir);

Multiple Documents

const docs = [
      { name: "cake", healthy: false },
      { name: "lettuce", healthy: true },
      { name: "donut", healthy: false }
    ];
// this option prevents additional documents from being inserted if one fails
const options = { ordered: true };
const result = await foods.insertMany(docs, options);
console.log(`${result.insertedCount} documents were inserted`);

Object ID

const { ObjectId } = require("mongodb");
const id = new ObjectId();

Is made of:

• A 4-byte timestamp, representing the ObjectId's creation, measured in seconds since the Unix epoch.

• A 5-byte random value generated once per process. This random value is unique to the machine and process.

• A 3-byte incrementing counter, initialized to a random value.

Get Timestamp when ID is created

console.log(id.getTimestamp());

await userCollection.insertOne({
      _id: id,
      name: "TestName with id",
      age: 20,
    });

Set ID during Insert

Read

Read Single Document

const database = client.db("task-manager");
const userCollection = database.collection("users");
const user = await userCollection.findOne({ name: "Bukowski" });
console.log({ user });

Read with ID

const user = await userCollection.findOne({
      _id: new ObjectId("6353af602e35bf22c12015e9"),
    });

Read Multiple Documents

const query = { age: { $gt: 20 } };  //find users with age greater than 20
const cursor = await userCollection.find(query);

await cursor.forEach((user) => console.log(user));

Count Documents With Query

userCollection.countDocuments(query).then((count) => {
      console.log(count);
    });

Update

Update Single Document

const filter = { _id: new ObjectId("6353c26540b9a601c01789c6") };
const query = {
      $set: {
        name: "Updated Name",
      },
};
const result = await userCollection.updateOne(filter, query);
console.log(result);

Update Multiple Documents

const filter = { completed: false };
const query = {
      $set: {
        completed: true,
      },
};
const result = await tasksCollection.updateMany(filter, query);

Delete

Delete Single Document

const filter = { age: 20 };
const result = await userCollection.deleteOne(filter);
if (result.deletedCount === 1) {
      console.log("Successfully deleted one document.");
} else {
      console.log("No documents matched the query. Deleted 0 documents.");
}

Delete Multiple Documents

const filter = { age: 20 };
const result = await userCollection.deleteMany(filter);
console.log("Deleted " + result.deletedCount + " documents");