[thelist] [php] holding objects in classes; problems

[James]

This code fails on the line marked with a star with a <b>Fatal 
error</b>:  Call to a member function on a non-object in ....

Why? It has to be some problem with storing the object in the class. 
The Pear DB results object is stored in ListField.Init  but lost in 
ListField.GetNextResult

Thanks for any help,
James.

<?

ini_set("include_path", "/CompiledSoftware/php");
require_once "DB.php";

$DataBase = DB::Connect("mysql://jobtracker:@localhost/jobtracker");
if (DB::isError($DataBase)) {
	die ("Could not connect to the DataBase - Error is: 
".$DataBase->getMessage());
}


class ListField {

	var $dbresults;
	var $row;

	function Init($field) {

		if ($field=="CompanyName") {
			$table="Company";
			$this->row="Name";
		} elseif ($field=="JobTitle") {
			$table="Job";
			$this->row="Title";
		} elseif ($field=="JobLocation") {
			$table="Job";
			$this->row="Location";
		}
		
		$sql = "SELECT " . $this->row ." FROM $table GROUP BY " . $this->row;
		$dbr1 = $GLOBALS["DataBase"]->query($sql);
		if (DB::isError($dbr1)) {
			die("DataBase Error listing fields: ".DB::errorMessage($dbr1));
		}

		$this->dbresults &= $dbr1;

	}

	function GetNextResult() {
		$dbr1 &= $this->dbresults;
		if ($line = $dbr1->fetchRow(DB_FETCHMODE_ASSOC)) {               
*******************
			return $line[$this->row];
		} else {
			return FALSE;
		}	
	}

}


		$results = new ListField();
		$results->Init("CompanyName");

		echo("<select size=10 name=CompanyName >");
		while ($line = $results->GetNextResult()) {
			echo("<option>" .$line ."</option>");
		}
		echo("</select><P>");




?>