PEAR DB not working in my Class.

[TreacherousDog]

Hi.. im sortof a newB so bare with me.... I'm using PEAR DB within a class I'm writing but I'm getting a fatal error saying that fecthrow() is not a defined function. Now I know Pear DB works and is installed etc. becuase I have used it succesfully on my server before.. I just never tried using it within a class.. here is the code in the class file:

<?php
	/************************
	* CLASS.SESSION.PHP
	* Handles user login.
	************************/
	require_once("DB.php");

class session {
	var $_strUserName;
	var $_strUserPass;
	var $_objConn;
	var $_objMail;


	// Class constructor...
	function session($name=' ',$pass=' ') {
		$this->_objConn =& DB::connect(DSN);

		if($_strUserName == ' ') {
			// Ensures a username was submitted...
			$this->_error("No user name was specified.");
			return FALSE;
		} else {
			$this->_strUserName = $name;
			$this->_strUserPass = $pass;
			$this->_authenticate();
		}
	}


	// Authenticates the user...
	function _authenticate() {
		$sql = "SELECT admin_id,admin_pass FROM administrators WHERE admin_name=" . $this->_strUserName;
		echo $sql;	
		$objRS = $this->_objConn->query($sql);
		$objRow = $objRS->fetchRow();

		if($objRS->numRows() < 1) {
			$this->_error("The user name you entered does not exist.");
			return FALSE;
		} elseif($objRS['admin_pass'] != $this->_strUserPass) {
			$this->_error("The password you entered is incorrect.");
			return FALSE;
		} else {
			echo "<p><strong>CONGRATULATIONS!</strong><br/>You have successfully logged into the site as: " . $this->_strUserName . "</p>";
		}
	}


	// Generates an error...
	function _error($strMessage) {
		echo "<p><strong class=\"error\">ERROR you could no be logged:</strong><br>";
		echo $strMessage;
	}
}
?>

And here is how the code is called and the class is called on the main page.

require_once("../_lib/config.php");
	require_once("../_lib/private/class.session.php");

if($_POST) {
	$objSession = new session($_POST["username"],$_POST["userpass"]);
}

This is the exact error im getting:
Fatal error: Call to undefined function: fetchrow() in /home/notjusta/www/www/_lib/private/class.session.php on line 36