Php+mysql, object-oriented, query

Php

Class mysql{
Public $host;
Public $root;
Public $password;
Public $database;

    function __construct ($host,$root,$password){        $this->host     =$host;                                         $this->root     =$root;        $this->password =$password ;    }    function connect (){        @mysql_connect  ($this->host,$this->root,$this->password);        mysql_select_db ($this->database);        mysql_query     ("set names utf8");    }    function close(){        mysql_close();    }    function select(){        $result=mysql_query("select * from users");        print_r ($result);    }}    $link=new mysql("localhost","root","","stu_system");$link->connect();$link->select();$link->close();

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Start for a few days, with object-oriented, write to the last feeling I still in the process of writing, how to do it ~ ~ ~
Finally, the page does not display information.
I self-study, limited capacity ~ ~ ~

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