when using a local testing server, you set the database up on your local machine.
the xampp control panel has a tool called MyPHPAdmin which is a gui tool of managing your local MySQL server. Using PHPMyAdmin you create the local database.
What DataAssist does is create web pages that allow you to manage a table in your database
It creates the pages to search the table, show results based on the search criteria, insert new records, update existing records or delete them.