[PHP] function misfunction

[Martin S]

I'm trying to redo a db lookup into a function. The function is placed in a 
class called tracking and declared thus:

function setCurrentDevGroup($devID)
        {
// start original routine
                $query = "SELECT dev_group FROM tracking WHERE (computer =             
                                                                                       
                                                                
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
                                                                                       
  $devID)";
                $sth = $adb->prepare($query);
                if($sth)
                {
                        $res = $sth->execute();
                        $resulttable = $sth->fetchrow_hash();
                        $lookuptable = $resulttable["dev_group"];
                        return($lookuptable);
                }
//end original routine
        }

This is called from the code as:

$tracking->setCurrentDevGroup($this->ComputerID); // $this->ComputerID is 
                                                  // known as eg 5.

In the page which relies on the value of setCurrentDevGroup I get:



 Call to a member function on a non-object in 
/www/htdocs/dev/include/irm.inc on line 2857

Line 2857 is the one starting "$tracking->" above. Obviously I'm doing 
something wrong here. What?

Cheers,

Martin S.

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