how do display database data in datatables dynamically

I want to display data in my datatable of webpage without reloading the webpage or click any button for the retrieval purpose, but i should be able to get more data using the pagination.
for example: https://datatables.net/examples/server_side/defer_loading.html
I need something of these kind but here the data is static, and even the ajax seems to pretty static in these example, i would like to know how would i achieve this task.
Thanks
Koka