MySQL查询，GET（id）？

Question

我编写了以下脚本，以基于mySQL查询创建.ics文件下载。

$start = date('Ymd', strtotime($row['CourseStartDate']));
$end = date('Ymd', strtotime($row['CourseEndDate']));
header("Content-Type: text/Calendar");
header("Content-Disposition: inline; filename=Bookings$id.ics");
echo "BEGIN:VCALENDAR\n";
echo "PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN\n";
echo "VERSION:2.0\n";
echo "METHOD:PUBLISH\n";
echo "X-MS-OLK-FORCEINSPECTOROPEN:TRUE\n";
echo "BEGIN:VEVENT\n";
echo "CLASS:PUBLIC\n";
echo "CREATED:20091109T101015Z\n";
echo "DESCRIPTION:{$row['Attendees']}\n";
echo "DTEND:{$end}\n";
echo "DTSTAMP:20100109T093305Z\n";
echo "DTSTART:{$start}\n";
echo "LAST-MODIFIED:20091109T101015Z\n";
echo "LOCATION:{$row['CourseLocation']}\n";
echo "PRIORITY:5\n";
echo "SEQUENCE:0\n";
echo "SUMMARY:{$row['CourseTitle']}\n";
echo "TRANSP:OPAQUE\n";
echo "UID:".date('Ymd') . 'T' .date('His').rand();
echo "X-MICROSOFT-CDO-BUSYSTATUS:BUSY\n";
echo "X-MICROSOFT-CDO-IMPORTANCE:1\n";
echo "X-MICROSOFT-DISALLOW-COUNTER:FALSE\n";
echo "X-MS-OLK-ALLOWEXTERNCHECK:TRUE\n";
echo "X-MS-OLK-AUTOFILLLOCATION:FALSE\n";
echo "X-MS-OLK-CONFTYPE:0\n";
echo "END:VEVENT\n";
echo "END:VCALENDAR\n";

MySQL的

$sql = "SELECT BookingID, CourseStartDate, CourseEndDate, CourseTitle,(' ',Forenames,' ', Surname) as Attendees, LastUpdated
FROM Bookings
GROUP BY CourseStartDate, CourseTitle
ORDER BY CourseStartDate DESC";

当我下载文件时，它会创建一个完美的日历事件，按计划将所有目标都作为目标，但是它仅返回一个课程，我希望能够逐课程地进行操作，即查看课程并可以选择“下载到日历”，然后根据该课程运行脚本！ 我尝试在if语句中编写，但无济于事。 我要去哪里错了？

Answer 1

如果我理解，您应该：

使用$ _GET通过您的课程ID。

例如，如果您正在查看“课程1”：

<a href="caltest.php?id=$course_id">Download to calendar</a>

然后在caltest.php的SQL查询中添加WHERE子句：

WHERE CourseId = $_GET['id']

注意：验证$_GET['id']有效，并使用准备好的语句以提高安全性