php操作mysql数据库的基本类代码

<?php
$dbhost=localhost;
$dbuser=root;
$dbpass=123456;
$dbname=products;
$connect=mysql_connect($dbhost,$dbuser,$dbpass);
if(!$connect) exit(数据库连接失败！);
mysql_select_db($dbname,$connect);
mysql_query(set names utf8);
//查询
$sql="SELECT * FROM `category`";
$result=mysql_query($sql);
while($row=mysql_fetch_array($result)){
 echo $row[id];
}
//插入
$sql="INSERT INTO `category` (`id`,`name`) VALUES (NULL,".$name.")";
$result=mysql_query($sql);
if(mysql_affected_rows()){
 echo 插入成功，插入ID为：,mysql_insert_id();
}else{
 echo 插入失败：,mysql_error();
}
//修改
$sql="UPDATE `category` SET `name`=".$name." WHERE `id`=".$id."";
$result=mysql_query($sql);
if(mysql_affected_rows()){
 echo 修改成功！;
}
//删除
$sql="DELETE FROM `category` WHERE `id`=".$id."";
$result=mysql_query($sql);
if(mysql_affected_rows()){
 echo 删除成功！;
}
//关闭连接
mysql_close($connect);
?>