How to receive submission data in the Database?

I have download your source code and injected in my website how can i connect to database and recieve details

Please refer to the following article How-to-send-Submissions-to-Your-MySQL-Database-Using-PHP

This allows receiving your submission data into MySQL with the help PHP script. 

Alternatively, you can also use Zapier's solution for MySql integration.

I hope this helps. Let us know if you have further questions.