1
我目前正在做一个学生管理系统,我需要做一个更新学生成绩的功能。由于所有的结果都是从数据库循环的,所以我很困惑如何使用相同的循环来更新数据。当我点击提交按钮时,我想将所有新标记(相同或更新的值)更新到数据库中。如何更新一系列来自php的循环数据?
我已经通过互联网做了一些研究,但他们的方式与我的完全不同。 这是我的代码。
<table class="table table-responsive" style="width: 100%;">
<tbody>
<tr>
<th>No</th>
<th>Student ID</th>
<th>Student Name</th>
<th>Student Result</th>
</tr>
<?php
$sql="select * from class INNER JOIN enrollment ON class.class_id=enrollment.class_id INNER JOIN student ON enrollment.stud_id=student.stud_id INNER JOIN registration ON student.reg_id=registration.reg_id WHERE class.sup_id='$sup_id' and enrollment.enrollment_status='Active' ";
$result=mysqli_query($con,$sql);
$i=1;
if(mysqli_num_rows($result)!=0)
{
while($row=mysqli_fetch_assoc($result))
{
?>
<tr>
<td><?php echo $i++ ;?></td>
<td><?php echo $row['stud_code']; ?></td>
<td><?php echo $row['stud_name']; ?></td>
<td><input type="text" class="form-control pw" value="<?php echo $row['class_gpa']; ?>" name="studgpa" id="studgpa"></td>
<td><input type="hidden" name="enrollid" value="<?php echo $row['enrollment_id']; ?>"></td>
</tr>
<?php
}
}
else
{
?>
<tr>
<td colspan='4' style="text-align:center; font-size:1.4em;">No record found!</td>
</tr>
<?php
}
?>
</tbody>
</table>
<button type="submit" name="subbtn" class="btn btn-default btn-block addcbtn" style="background-color: #e4e4e4; "><i class="glyphicon glyphicon-send" ></i>Update</button>
if(isset($_POST['subbtn']))
{
$gpa=$_POST['studgpa'];
$enrollid=$_POST['enrollid'];
$sql2="select * from class INNER JOIN enrollment ON class.class_id=enrollment.class_id INNER JOIN student ON enrollment.stud_id=student.stud_id INNER JOIN registration ON student.reg_id=registration.reg_id WHERE class.sup_id='$sup_id' and enrollment.enrollment_status='Active' ";
$result2=mysqli_query($con,$sql2);
while(mysqli_fetch_assoc($result2))
{
mysqli_query($con,"update enrollment set class_gpa='$gpa' where enrollment_id='$enrollid");
}
}