Home >Backend Development >PHP Tutorial ><select>数据传递的有关问题

<select>数据传递的有关问题

WBOY
WBOYOriginal
2016-06-13 10:23:221059browse

 

























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
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn