分享一个mysql类

<?php
class Db_mysql{
    public function query($sql){
        if ( !mysql_ping($this--->db_connect) ){
            self::__destruct();
            self::__construct($this-&gt;db_host,$this-&gt;db_user,$this-&gt;db_pwd,$this-&gt;db_name,$this-&gt;db_charset);
        }
    }
    function __destruct(){
        mysql_close($this-&gt;db_connect);
    }
}

小技巧：
1:DB自动重边,query时，判断链接是否已经丢失。由于PHP的DB链接有缓存，所以先将其关闭再连接,或者用true参数连接。
2:在结束要释放链接.

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