[OOP in PHP]

I was wondering if anyone could help me figure out where I am screwing up! I'm trying to write a really simple class that gets a MySQL resource link AND selects the proper database. In a separate definitions file I call the constructor and populate the new object's fileds. Then, in the actual working file, I include the definitions file. The MySQL error tells me that the resource link is invalid, and I don't know why.

First, the class:

[code]class DataConnection{
    var $hostname;
    var $username;
    var $password;
    var $database;
    var $datalink;
    
    function setHostname($pV){
        $this->hostname = $pV;
    }
    
    function getHostname(){
        return $this->hostname;
    }
    
    function setUsername($pV){
        $this->username = $pV;
    }
    
    function getUsername(){
        return $this->username;
    }
    
    function setPassword($pV){
        $this->password = $pV;
    }
    
    function getPassword(){
        return $this->password;
    }
    
    function setDatabase($pV){
        $this->database = $pV;
    }
    
    function getDatabase(){
        return $this->database;
    }
    
    function setDatalink($pV){
        $this->datalink = $pV;
    }
    
    function getDatalink(){
        return $this->datalink;
    }
    
    function DataConnection($pV1,$pV2,$pV3,$pV4){
        $this->hostname = $pV1;
        $this->username = $pV2;
        $this->password = $pV3;
        $this->database = $pV4;
        $this->datalink = mysql_pconnect($this->hostname,$this->username,$this->password);
        if(!$this->datalink){
            return 0;
        }
        else if(!mysql_select_db($this->database,$this->datalink)){
            return 0;
        }
        else return $this->datalink;
    }    
}[/code]

Then, the definitions file (values deleted):

[code]include "DataConnection.php";

function getDatalink(){
    if($_SERVER['WINDIR']){
        $db_link = new DataConnection("","","","");
        return $db_link;
    }
    if(!$_SERVER['WINDIR']){
        $db_link = new DataConnection("","","","");
        return $db_link;
    }
}[/code]

Finally, part of the working document:

[code]require_once('../inc/DataConnection.php');

session_start();

$query_myResult = "SELECT * FROM rickhomepage WHERE pageNumber = 1";
$myResult = mysql_query($query_myResult, $datalink) or die(mysql_error());
$row_myResult = mysql_fetch_assoc($myResult);
$totalRows_myResult = mysql_num_rows($myResult);[/code]

Any help would be appreciated!