[TIL] 0727

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Today I Learnt 

 

0727 :

 

 

 

MongoDB Triggers

 

MongoDB Triggers are a piece of code that lets you execute server-side logic after the occurrence of a database event, for example, when data is added, updated, or removed. You can use database triggers to create complex data interactions

https://hevodata.com/learn/mongodb-triggers/

 

 

 

Streams,

 

when there is change in db , you can get notified 

(ex,  stock gone 0. -> let seller know )

can use Built-in event emitter class from node js 

 

 

 

https://www.mongodb.com/developer/languages/javascript/nodejs-change-streams-triggers/#create-a-mongodb-atlas-trigger

Change Streams & Triggers with Node.js Tutorial | MongoDB

 

 

Ngnix : load balancer ?

 

 

React :

 

components    

 

class / function

class components no one use it anymore...

import React, { Component } from 'react';

/ state = {

// habits: [

// { id: 1, name: "Reading", count: 0 },

// { id: 2, name: "Coding", count: 0 },

// { id: 3, name: "Leanring", count: 0 },

// ],

// };

 

 

// handleIncrement = (habit) => {

// console.log(" handle increment ", habit);

// const habits = [...this.state.habits];

// const index = habits.indexOf(habit);

// habits[index].count++;

// this.setState({ habits });

// };

 

class ComponentName extends Component {

render() {

return (

<div>

 

</div>

);

}

}

 

export default CompoenentName

instead of using hook ,  use this binding.