soap vs sql

guys, Im new to soap. I need to get data from that.

the webpage says for example this function.

function _getCarsList();
$client=new SoapClient(
        'http://api.webdispecink.cz/code/WebDispecinkServiceNet.php?wsdl');
$return=$client->_getCarsList(
        $_POST['kod2'], $_POST['jmeno2'], $_POST['heslo2']);

foreach($return as $item) var_dump($item);

How do I get the data from sql server?

... Podlesnick ...