Is it safe to make an application with direct queries to the DB?

Question

Java

Is it safe to make an application that will directly connect to the database using jdbc and manipulate it? Or is it better (and more correct) to make a separate server and protocol for interacting with it?

Answer 1

Through the internet you mean?
Safely. But it is not rational for performance reasons.

Answer 2

It is safe if the connection is encrypted, otherwise it is not recommended.
It is better to have a backend with a REST/SOAP/etc API, then it will be painless to tie something else.

Answer 3

alfss
Absolutely not safe, even if the traffic is encrypted, read below.
@author
You need to have a backend so that the values ​​first go through sanitation, and then queries are already generated in the database to avoid SQL injections.