无语的失误,mysql_fetch_array()

无语的出错,mysql_fetch_array()
代码如下，求帮忙看一下吧!

class Conn{

	private $dbhost = "";			//服务器

	private $dbuser = "";			//mysql帐号

	private $dbpsw = "";			//mysql密码

	private $dbchar = "";			//数据库编码类型

	private $dbname = "";			//数据库名称

	private $tablepre = "";			//表前缀

	private $conn = NULL;			//连接对象 

	

	/**

	 * 数据库链接初始化

	 */

	public function __construct(){

		$this->getConn();

	}

	

	public function getConn(){

		$db = require_once 'config/config.php';

		$this->dbhost = $db['dbhost'];

		$this->dbuser = $db['dbuser'];

		$this->dbpsw = $db['dbpsw'];

		$this->dbchar = $db['dbchar'];

		$this->dbname = $db['dbname'];

		$this->tablepre = $db['tablepre'];

		$this->conn = mysql_connect($this->dbhost,$this->dbuser,$this->dbpsw) or die(mysql_error()."
Mysql连接失败!");

		mysql_select_db($this->dbname,$this->conn) or die(mysql_error()."
数据库访问出错");

		mysql_query("set names ".$this->dbchar,$this->conn);

	}

	

	/**

	 * 执行sql

	 */

	public function query($sql){

		return mysql_query($sql,$this->conn) or die(mysql_error()."
SQL执行出错：$sql");

	}

	

	/**

	 * 返回多条记录

	 */

	public function getDataArrays($sql,$type = MYSQL_BOTH){

		$result = $this->query($sql);

		$refArr = array();

		while ($row = mysql_fetch_array($result,$type)){

			$refArr[] = $row;

		}

		return $refArr;

	}



	

	/**

	 * 关闭数据库链接

	 */

	public function closeConn(){

		mysql_close($this->conn);

	}

}

调用如下：

$conn = new Conn();

$sql = "select * from qj_content";

$contentList = $conn->getDataArrays($sql,MYSQL_ASSOC);

$conn->closeConn();

执行结果如下：
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in D:\AppServ\www\qjcentury\conn.php on line 45


第45行代码在上面用红色标注了 MySQL PHP 数据库连接 查询