PHP member function getrows problem

Any Help fixing this error

 $query3 = "SELECT * from hidden WHERE USERID = '".mysql_real_escape_string($_SESSION['USERID'])."'";

 	$executequery3 = $conn->Execute($query3);

	$hidden = $executequery3->getrows();   

$query2 = "SELECT A.*, B.seo, C.*, D.PID from Table1 A, Table2 B, Table3 C, hidden D where A.active='1' AND A.category=B.CATID AND A.USERID=C.USERID AND D.PID!=$hidden.PID order by A.feat desc, limit $pagingstart, $config[items_per_page]";

PHP:

Here is the error LOG details

 PHP Fatal error:  Call to a member function getrows() on a non-object in /home/user/public_html/domain/file.php on line ...[where above code is stated]

Code (markup):

i want this as

$query2 = "SELECT A.*, B.seo, C.*, D.PID from Table1 A, Table2 B, Table3 C, hidden D where A.active='1' AND A.category=B.CATID AND A.USERID=C.USERID AND D.PID!=A.PID order by A.feat desc, $dby limit $pagingstart, $config[items_per_page]";

PHP:

the part

D.PID!=A.PID

PHP:

works for every one even user loged in or not or this data is related to logedin user or anyone else
and i want it as

select D.PID from Row where "_$Session userid"=USERID

PHP:

 

Well not sure what happened

 $query3 = "SELECT PID from hidden_new WHERE USERID = '".mysql_real_escape_string($_SESSION['USERID'])."'";

 	$executequery3 = $conn->Execute($query3);

	$hidden_new = $executequery3->fields['PID'];  

PHP:

$query2 = "SELECT A.*, B.seo, C.* from Table1 A, categories B, members C where A.active='1' AND A.category=B.CATID AND A.USERID=C.USERID AND A.PID!='$hidden_new' order ..";

PHP:

called query3 results here in query2 as

AND A.PID!='$hidden_new'

PHP:

above code worked for me but i am still confused
i used same above code for my old table "HIDDEN" but it gave the same error

later i created a new table "hidden_new" and problem fixed