u_login.php

简单的学生成绩管理系统～实现了学生成绩的登记

<?php require("dbconnect.php");
$id = $_POST["id"];
$passwd = $_POST["passwd"];

if( empty($id))
   echo("<script type = 'text/javascript'> alert('id为空！') ;". " location.href='index.php'; </script> ");
  
if( empty ($passwd) )
   echo ("<script type = 'text/javascript'> alert('密码为空！') ; ". " location.href='index.php'; </script>" );
 
 $sql = "select * from user_info where id = '$id' and passwd = '$passwd'";
 $result = mysql_db_query("score_manager",$sql);
 $num = mysql_num_rows($result); 
 if($num == 0)
 {
    echo ("<script type = 'text/javascript'> alert('用户名或密码不正确!');". " location.href='index.php';</script> ");
  mysql_close();
  exit;
  }
  else
  {
  setcookie("id_cookie","$id");
  setcookie("passwd_cookie","$passwd");
  echo("<script type='text/javascript'>alert('成功登录！'); ". " location.href='welcome.php';</script>");
  }
 ?>