Database Read and Write selection

Hello everybody.
I wanted to make a Read and Write dataset for my database, but instead of using buttons to select a user from my database, I want to use an input.

Example : You type in George in the first input and you get George’s informations on the rest of the inputs, you can then change his information and update it using a button.

The question is : How can I do that ? Can I get a code and explanation ?

Thank you.