php类

<?php

class mysql{

private $host ;

private $user = "root";

private $pwd = "";

private $db = "bbs";

private $charset = "utf8";

private $conn = "";

public function
__construct($host="127.0.0.1",$user="root",$pwd="",$db="bbs",$charset="utf8"){

$this->host = $host;

$this->user = $user;

$this->pwd = $pwd;

$this->db = $db;

$this->charset = $charset;

$this->conn = get_conn();

}

public function get_conn(){

//像下面这种写代码的方式，一般俗称 硬代码

//好的程序习惯是，可以设置为变量，那么一定要设置为变量

//可以设置为常量，那么最好设置为常量
//

mysql_connect("127.0.0.1","root","root");

$conn =
mysql_connect($this->host,$this->user,$this->pwd) or
die(mysql_error());

mysql_select_db($this->db,$this->conn);

mysql_query("set names ‘$this->charset‘");

return $conn;

}

public function myquery($sql){

$result = mysql_query($sql);

return $result;

}

public function delete($sql){

$this->myquery($sql);

return mysql_affected_rows();

//如果执行删除成功,那么肯定有受影响的行数 //

return $result;

}

public function insert($sql){

}

}

$mysql = new mysql("127.0.0.1","root","","bbs","utf8");

//$mysql->host = "127.0.0.1";

?>