php 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");

?>
//该片段来自于http://outofmemory.cn