<?
class MysqlConn {
	private $conn;
	private $my_db;
	private $result;
	
	public function  __construct() {
		require_once("db_config.php");
		$this->conn = mysql_pconnect($db_server, $db_user, $db_pwd);
		$this->my_db = mysql_select_db($db_name,$this->conn);//选择数据库
		
	}
		
	public function  query($sql){
		$this->result = mysql_query($sql, $this->conn); // 执行查询语句
		return $this->result;
	}
	
	public function next(){
		return $row = mysql_fetch_array($this->result);
		
	}
	
	public function close(){
		mysql_free_result($this->result); 		
	}	
	//使用转义字符,保证系统安全.
	public  function escapeString($str){
		return mysql_escape_string($str); 
	}
}
?>