Jquery auto-suggest from database table

What are the steps to creating an auto-suggest text field 开发者_Go百科that grabs for instance usernames from my database?

I plan to use the Jquery UI autocomplete plugin. The goal is to have a quick and very secure method.

This tutorial should help: http://www.jensbits.com/2010/03/29/jquery-ui-autocomplete-widget-with-php-and-mysql/