关于php向mysql中添加数据问题

Question

<?php

include("config.php");

$From=$_POST['Kname'];

$User=$_POST['Qtime'];

$Skind=$_POST['Ytime'];

$Belong=$_POST['Xname'];

if($From!=""){

$sql="INSERT INTO server(id,From,User,Skind,Belong) VALUES ('','$From','$User','$Skind','$Belong')";

if(mysql_query($sql)){

echo"<script>alert('添加成功！'); javascript:window.location.href=document.referrer;</script>";

}

else{

echo "上传失败！";

}

}else

{

echo"数据为空";

}

?>

以上无法像数据库添加数据 求解