Echo specificity extra field

How do I print a specific field in a template? Now displays all fields.
I found in forum this HelperOspropertyFieldsPrint::showField($field,2);
I write this in this file listing.html.tpl.php.
But why then the field will not be displayed.
Please help me.

Hi Ivan,
You should get data of custom field and pass it into variable: $field
Thanks
Dam

So ?
<?php
$field = $db->loadObject();
HelperOspropertyFieldsPrint::showField($field,2);
?>

tell me what am I doing wrong?

Hi Ivan,
You should have:
XXX is ID of extra field

Thanks
Dam

I for some reason does not appear, maybe I'm doing something wrong?

I understand that the $ pid tid is a particular object, but I want it to output field for all objects.
I have no output