操作MySQL数据库的php类

<?php
///////////////////数据库连接类////////////////////
class connect{
	private $host;//主机名
	private $name;//用户名
	private $pass;//密码
	private $conn;//连接句柄名
	private $db;//数据库句柄名
	private $dbname;//数据库名

//===================================================================
	function open($addr,$dbuser,$psw){//连接主机
		$this->host=$addr;
		$this->name=$dbuser;
		$this->pass=$psw;
		$this->conn=mysql_connect($this->host,$this->name,$this->pass);		
	}
	
	function opendb($database,$charset){//连接数据库
		$this->dbname=$database;
		mysql_query("set names ".$charset);//设置字符集
		$this->db=mysql_select_db($this->dbname,$this->conn);
	}
	function close(){//关闭主机连接
		mysql_close($this->conn);
	}
	
//===================================================================
	
	function __construct($addr,$dbuser,$psw){
		$this->open($addr, $dbuser, $psw);
	}
	
	function __toString(){
		if($this->conn){
			$msg= "用户".$this->name."登录主机成功。";
		}else {
			$msg= "用户".$this->name."登录主机失败。";
		}
		if($this->db){
			$msg.= "连接".$this->dbname."数据库成功。";
		}else{
			$msg.= "连结".$this->dbname."数据库失败。";
		}
		
		return $msg;
	}
	function __call($n,$v){//错误方法吸收
		return "不存在".$n."()方法";
	}
	
}

////////////////示例/////////////////////

//  $db=new connect("localhost", "root", "lijun");

//  $db->opendb("message", "utf8");

//  echo $db;

//  $db->close();

//  $db->open("localhost","root","lijun");

//  $db->opendb("message", "utf8");

//  echo $db->ji("er");
 
?>