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I want to make a client-side, Windows-based application that allows the user to register and it will store the registration details in an online MySQL server.

However when i googled ways to do this, I found that to establish such a MySQL connection I should provide an SQL user with write permissions and also provide that SQL user’s password (All these should be in my code).

This leads to a problem; if someone decompiled my application, they could get my SQL user and password, and they could see and do anything to my SQL database.

Is there anyway to prevent this?

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    I would never leave a database exposed to the internet, period. – multithr3at3d Nov 25 '19 at 3:32
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Yes and no.

First the no: As you have realized, if any data you put in an app that you send to a client can be extracted from it. You can take steps to make it harder to find the password (obfuscation, encryption, etc) but as a general rule of thumb, never put anything in the app that isn't supposed to be public.

So how do you protect your database password? Simple: don't store it in the app. Make a small web application that the app sends the registration details to, and then have the web application store things in the database. This way credentials never leave your control.

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    Basically like an API or middleman that transfer your credentials in a encrypted and secure way. – Cash- Nov 25 '19 at 5:36
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Whatever you write in your application code can be reversed and found by an attacker who has access to the binary and/or source code.

You can put the password in the database, or in a separate file, but at the end it just moves the same problem elsewhere.

Unfortunately there is only one proper way to do it, and it costs money: using a digital vault which stores the password securely. The application would use the permissions it runs with to access the vault.

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