How to protect site from deleting database of php my admin?

Have a look into the below links.

https://blogs.msdn.microsoft.com/brian_swan/2010/03/04/whats-the-right-way-to-prevent-sql-injection-in-php-scripts/

http://php.net/manual/en/security.database.sql-injection.php

https://paragonie.com/blog/2015/05/preventing-sql-injection-in-php-applications-easy-and-definitive-guide

https://www.phpjabbers.com/how-to-prevent-sql-injection-with-php-php71.html

I'm assuming there are SQL injection vulnerability?

http://www.wikihow.com/Prevent-SQL-Injection-in-PHP

Hi,

I mean I want to protect my website database from inserting some query which remove all the data of the databases.

Try to create two users one user for super admin with all access and another user with only select, insert, Alter.

how the attack happen? through the application?