How Can I show a custom view instead of the generic error attached in cases of the database going down unexpectedly? <img src="https://i.stack.imgur.com/3GxoC.png" alt="enter image description here">

In applications folder there is a folder named errors. There are all <code>error files</code> which comes up when an error is occurred. When database error is occured, error_db.php file is shown in browser. You can edit it or replace that with your custom file. Hope this helps.