我正在开发一个简单的考勤系统，其中由老师参加，然后保存到数据库。但是，我在将数据保存到数据库时遇到问题。当我点击“提交出勤”时，数据将不会提交给数据库。我使用register.php注册学生，但参加不同的文件。 以下是我用来提交的代码。有人能帮我吗？感谢。
抱歉，我共享的文件应该将数据保存到mysql数据库。下面是获取数据的文件，但仍然存在保存问题。这是参加考试的教师档案 teacher.php
<?php
$pageTitle = 'Take Attendance';
include('header.php');
require("db-connect.php");
if(!(isset($_COOKIE['teacher']) && $_COOKIE['teacher']==1)){
echo 'Only teachers can create new teachers and students.';
$conn->close();
include('footer.php');
exit;
}
//get session count
$query = "SELECT * FROM attendance";
$result = $conn->query($query);
$sessionCount=0;
setcookie('sessionCount', ++$sessionCount);
if(mysqli_num_rows($result)>0){
while($row = $result->fetch_assoc()){
$sessionCount = $row['session'];
setcookie('sessionCount', ++$sessionCount);
}
}
if(isset($_GET['class']) && !empty($_GET['class'])){
$whichClass = $_GET['class'];
$whichClassSQL = "AND class='" . $_GET['class'] . "'";
} else {
$whichClass = '';
$whichClassSQL = 'ORDER BY class';
}
echo '
<div class="row">
<div class="col-md-4">
<div class="input-group">
<input type="number" id="session" name="sessionVal" class="form-control" placeholder="Session Value i.e 1" required>
<span class="input-group-btn">
<input id="submitAttendance" type="button" class="btn btn-success" value="Submit Attendance" name="submitAttendance">
</span>
</div>
</div>
<div class="col-md-8">
<form method="get" action="' . $_SERVER['PHP_SELF'] . '" class="col-md-4">
<select name="class" id="class" class="form-control" onchange="if (this.value) window.location.href=this.value">
';
// Generate list of classes.
$query = "SELECT DISTINCT class FROM user ORDER BY class;";
$classes = $classes = mysqli_query($conn, $query);
if($classes && mysqli_num_rows($classes)){
// Get list of available classes.
echo ' <option value="">Filter: Select a class</option>';
echo ' <option value="?class=">All classes</option>';
while($class = $classes->fetch_assoc()){
echo ' <option value="?class=' . $class['class'] . '">' . $class['class'] . '</option>';
}
} else {
echo ' <option value="?class=" disabled>No classes defined.</option>';
}
echo '
</select>
</form>
</div>
</div>
';
$query = "SELECT * FROM user WHERE role='student' $whichClassSQL;";
$result = $conn->query($query);
?>
<table class="table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Email</th>
<th>Class</th>
<th>Present</th>
<th>Absent</th>
</tr>
</thead>
<tbody>
<form method="post" action="save-attendance.php" id="attendanceForm">
<?php
if(mysqli_num_rows($result) > 0){
$i=0;
while($row = $result->fetch_assoc()){
?>
<tr>
<td><input type="hidden" value="<?php echo($row['id']);?>" form="attendanceForm"><input type="text" readonly="readonly" name="name[<?php echo $i; ?>]" value="<?php echo $row['fullname'];?>" form="attendanceForm"></td>
<td><input type="text" readonly="readonly" name="email[<?php echo $i; ?>]" value="<?php echo $row['email'];?>" form="attendanceForm"></td>
<td><input type="text" readonly="readonly" name="class[<?php echo $i; ?>]" value="<?php echo $row['class'];?>" form="attendanceForm"></td>
<td><input type="radio" value="present" name="present[<?php echo $i; ?>]" checked form="attendanceForm"></td>
<td><input type="radio" value="absent" name="present[<?php echo $i; ?>]" form="attendanceForm"></td>
</tr>
<?php $i++;
}
}
?>
</form>
</tbody>
</table>
<script>
$("#submitAttendance").click(function(){
if($("#session").val().length==0){
alert("session is required");
} else {
$.cookie("sessionVal", $("#session").val());
var data = $('form#attendanceForm').serialize();
$.ajax({
url: 'save-attendance.php',
method: 'post',
data: {formData: data},
success: function (data) {
console.log(data);
if (data != null && data.success) {
alert('Success');
} else {
alert(data.status);
}
},
error: function () {
alert('Error');
}
});
}
});
</script>
<?php
$conn->close();
include('footer.php');
save-attendance.
<?php
//include ("nav.php");
require("db-connect.php");
$query = "SELECT * FROM user WHERE role='student'";
$result = $conn->query($query);
$nameArray = Array();
$count = mysqli_num_rows($result);
if(isset($_COOKIE['sessionCount'])){
$sessionCount = $_COOKIE['sessionCount'];
}
//save record to db
if(isset($_POST['formData'])) {
//increment the session count
if(isset($_COOKIE['sessionCount'])){
$sessionCount = $_COOKIE['sessionCount'];
setcookie('sessionCount', ++$sessionCount);
}
parse_str($_POST['formData'], $searcharray);
//print_r($searcharray);die;
//print_r($_POST);
for ($i = 0 ; $i < sizeof($searcharray) ; $i++){
// setcookie("checkloop", $i);;
$name = $searcharray['name'][$i];
$email= $searcharray['email'][$i];
$class = $searcharray['class'][$i];
$present= $searcharray['present'][$i];
if(isset($_COOKIE['sessionVal'])){
$sessionVal = $_COOKIE['sessionVal'];
}
//get class id
$class_query = "SELECT * FROM class WHERE name='".$class."'";
$class_id = mysqli_query($conn, $class_query);
if($class_id){
echo "I am here";
while($class_id1 = $class_id->fetch_assoc()){
$class_id_fin = $class_id1['id'];
echo $class_id['id'];
}
}
else{
echo "Error: " . $class_query . "<br>" . mysqli_error($conn);
}
//get student id
$student_query = "SELECT * FROM user WHERE email='".$email."'";
$student_id = $conn->query($student_query);
if($student_id) {
while ($student_id1 = $student_id->fetch_assoc()) {
$student_id_fin = $student_id1['id'];
}
}
//insert or update the record
$query = "INSERT INTO attendance VALUES ( '".$class_id_fin."', '".$student_id_fin."' , '".$present."','".$sessionVal."','comment')
ON DUPLICATE KEY UPDATE isPresent='".$present."'";
print_r($query);
if(mysqli_query($conn, $query)){
echo json_encode(array('status' => 'success', 'message' => 'Attendance added!'));
} else{
echo json_encode(array('status' => 'error', 'message' => 'Error: ' . $query . '<br>' . mysqli_error($conn)));
}
}
$conn->close();
}
答案 0 :(得分：0)
您没有提供大量信息，但我从评论中了解到错误是$ sessionVal未定义。
如果未设置$ _COOKIE ['sessionVal']，请尝试：
1- print_r（$ _ COOKIE）并检查是否设置了[sessionVal];
2-尝试将后备添加到：
if(isset($_COOKIE['sessionVal'])){
$sessionVal = $_COOKIE['sessionVal'];
}
else {
$sessionVal = 0;
}
或
$sessionVal = (isset($_COOKIE['sessionVal'])) ? $_COOKIE['sessionVal'] : 0;
最重要的是，没有必要检查是否设置了变量，并且没有设置回退，以防未设置。