With ANet it would work this way:
Lite-C+ANet:
http_init();
//Call add.php and overgive a string s with the content "Blabla"
http_post(_str("http://www.host.com/add.php"),_str("s=Blabla"));
add.php:
<?php
//Get the content of 's':
string_s = _POST['s'];
?>
Now you only need to do the mysql instructions. But I'm not an expert of php. Best would be to ask this question in a php forum.
Btw. if you need the mysql thing for an internet server list, ANet Pro offers you a ready made template with all php scripts, lite-c scripts and a "How to set up everything".