数据库类的封装

将数据库常用的操作（连接数据库，获得所有数据，获得一条记录，获得一列记录，获得一条索引数组，获得一条关联数组）都给封装到db.class.php里面，谁需要谁继承这个类
注意：提交封装的类文件
<?php


class db{
    private $host;
private $dbname;
private $user;
private $pass;
public function __construct($host,$dbname,$user,$pass){
  $this->host=$host;
  $this->dbname=$dbname;
  $this->user=$user;
  $this->pass=$pass;
  $this->connect();
}
private function connect(){
       mysql_connect($this->host,$this->user,$this->pass);
  mysql_select_db($this->dbname);
  mysql_query("set names utf8");
}
public function getAll($sql){
$result = mysql_query($sql);
$rows = array();
while($row = mysql_fetch_assoc($result)){
$rows[] = $row;
}
return $rows;
}
public function getOne($sql){
$result = mysql_query($sql);
$total = mysql_fetch_array($result);
$total_row = $total[0];
return $total_row;
}
}
?>