How to use Dajax to work with MySql?

Question

Django

Hello.
Tell me please.
For the first time I came across the Dajax library for Django, connected it, everything works. The question is:
How do I access the Database using this library? For example, if a user enters his login during registration, and I need to display an inscription for him without reloading the page, if such a login already exists in the database and is occupied by another user?
Tell me or give a link, how is it implemented like this? I did not find anything like this in the documentation for Dajax ...
Thank you

Answer 1

And I didn't find it :)
I can only offer an alternative in the form of jQuery. Here is an example :)