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<select>数据传递的有关问题

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Release: 2016-06-13 13:31:06
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inquire_classroom.php


  inquire the classroom


CRMS - Inquire the classroom


  // create short variable names
  $lesson_id=$_POST['lesson_id'];

$con = mysql_connect("localhost","root","");
//通过服务器locahost建立连接,用户名为root,无密码

if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }//如果不成功,显示错误
mysql_select_db("crms", $con);//选择数据库

if (!mysql_select_db("crms", $con)) die(mysql_error()); 

$search_lesson_id = "SELECT * FROM use2 WHERE lesson_id = '{$lesson_id}'";
$result = mysql_query($search_lesson_id,$con);
if (!$result)
  {
  die("The lesson does not exist.");
  }

while($row = mysql_fetch_array($result))
  {
  echo $row['Cno'];
  echo $row['CID'];
  echo "
";
  }

mysql_close($con);
?>


下拉框选择了一个值提交后,出现
Notice: Undefined index: lesson_id in D:\xampp\htdocs\inquire_classroom.php on line 9
D301001 的错误。但是这里
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