Next.js + MySQL UPSERT | Update Applicant Profile Form (React Hook Form)

📂 Source Code
👉 GitHub Repo: https://github.com/thapatechnical/job-portal-nextjs

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In this video, we build a real-world Applicant Profile Settings Page in our Job Portal Application using Next.js and MySQL.

Users may:
• Fill profile for the first time
• Update their existing profile later

Instead of creating two separate forms (Create + Update), we implement a powerful UPSERT logic.

You’ll learn:

What is UPSERT in MySQL

How to use INSERT ... ON DUPLICATE KEY UPDATE

How to detect whether to insert or update

How to toggle button text (Save Profile / Update Profile)

How to use isDirty and isSubmitting from React Hook Form

When to disable the submit button

Writing clean backend logic for real production apps

This is a must-watch if you want to become a serious full-stack developer.
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⌛TIMELINE⏳
0:00 Adding Update Function to Applicant Profile
1:20 What is UPSERT in MySQL?
1:52 Support the Channel ❤️
2:10 Creating the UPSERT Backend Function
3:35 Important Concepts Before Writing UPSERT
5:10 UPSERT Code Explained Step by Step
6:30 How to Check Insert vs Update in Database
9:05 Changing Button Text (Save / Update Profile)
11:20 isDirty & isSubmitting in React Hook Form
12:35 When to Disable Submit Button
13:30 Dynamic Button Text Logic

Видео Next.js + MySQL UPSERT | Update Applicant Profile Form (React Hook Form) канала Thapa Technical