Startup Idea : Database physically protected

The idea is to physically protect the database by separating the server side and the client side completely, to make it we convert the request from the client side into QR code and we display it on a screen, the server can read the code Using a laser, of course it will refuse any code that does not respect the predefined forma and will execute the query , and will on its side display the result as QR code as the machine that will pass it to the Client side will read it using a laser. I think this idea can help to protect the database that includes sensitive information, and only allows the processing of data locally. Ps: be patient to understand what i mean and forgive my poor english. :)