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数据传递的问题
inquire.html


inquire the classroom



CRMS - Inquire the classroom











Classroom ID






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
相关标签: quot option lt gt value

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