Question

我正在使用考勤管理系统，但无法理解。请帮助我

<form method="post">
   <div class="table-responsive py-4">
      <table class="table table-flush" id="datatable-basic">
         <thead class="thead-light">
            <tr>
               <th>Name</th>
               <th>Father's Name</th>
               <th>Hall Ticket</th>
               <th>Department</th>
               <th>Attendace</th>
            </tr>
         </thead>
         <tbody>
            <?php
               if(isset($_POST["search_students"])){
                 $department=$_POST['department'];

                 $sql = "SELECT * FROM student_info WHERE department='$department'";
                 $result = $conn->query($sql);

                 if ($result->num_rows > 0) {
                   while($row = $result->fetch_assoc()) {
                     echo "<tr>";
                     echo  "<td>".$row["name"]."</td>";
                     echo  "<td>".$row["father_name"]."</td>";
                     echo  "<td>".$row["hall_ticket"]."</td>";
                     echo  "<td>".$row["department"]."</td>";
                     echo  "<td>
                             Present <input type='radio' name='attendance[".$row['hall_ticket']."][".$row['department']."]' value='Present'>
                             Absent <input type='radio' name='attendance[".$row['hall_ticket']."][".$row['department']."]' value='Absent'>
                       </td>";
                     echo "</tr>";
                   }
                 }
               }
               ?>
         </tbody>
      </table>
   </div>
   <div class="col-lg-12 mb-3">
      <button type="submit" name="mark_attendance" class="btn btn-success">Mark Attendance</button>
   </div>
</form>
</div>
<?php
   if(isset($_POST["mark_attendance"])){
       $attendance=$_POST['attendance'];

       foreach ($attendance as $key => $value) {



         if($value=="Present") {
           $query="Insert into attendance (hall_ticket,attendance) values ('$key','Present')";
           $insertAttendance=$conn->query($query);               
         }
       else {
         $query="Insert into attendance (hall_ticket,attendance) values ('$key','Absent')";
         $insertAttendance=$conn->query($query);
       }
     }

     if($insertAttendance){
       echo "Attendance Updated Sucessfully";
     }


   }
     ?>
</div>

在这里，我想将2个密钥作为礼堂票价值和部门价值存储到我的数据库中。

attendance[".$row['hall_ticket']."][".$row['department']."]

如何使用两个变量存储到我的数据库中。我想将每个餐桌人员的出席情况与他们的部门和礼堂一起存储。如果我从名字中删除部门，而只是使用$ key来存储值，我将获得资格证。

Answer 1

尝试以下代码：

HTML代码（已创建虚拟数据以供参考）：

<form action='new.php' method="POST" >
    Presnt<input type="radio" name="attendance[111][555]" value="present"><br>
    Absent<input type="radio" name="attendance[111][555]" value="absent"><br><br>
    Presnt<input type="radio" name="attendance[222][555]" value="present"><br>
    Absent<input type="radio" name="attendance[222][555]" value="absent"><br><br>
    Presnt<input type="radio" name="attendance[333][555]" value="present"><br>
    Absent<input type="radio" name="attendance[333][555]" value="absent"><br>
<input type="submit">
</form>

PHP代码：

<?php
 $attendance=$_POST['attendance'];
 $data = "";
foreach ($attendance as $key => $value) {
     $department = array_keys($value)[0];   
     $data.="('". $key ."','". $department ."', '" . $value[$department] . "'),";   
}
$query = "INSERT INTO attendance (hall_ticket,department,attendance) VALUES " . 
rtrim($data, ",");

// Your Query will look like:
// Query = "INSERT INTO attendance (hall_ticket,department,attendance) 
//          VALUES ('111','555', 'present'),
//                 ('222','555', 'present'),
//                 ('333','555', 'absent')";

// Now execute your query
$conn->query($query); 
echo $sql;
?>

注意：

永远不要在数据库中出现循环
即使该代码对您有用，但它已开放用于SQL注入，您应该使用prepared statement来构建和执行查询。

Answer 2

所以您$attendance是

$attendance=array(
$row['hall_ticket'] => array(
$row['departement']"=> [" present " OR "absence"]
);

我所了解的

我的解决方法是

foreach ($attendance as $hall => $departements) {
  foreach($departements as departement => $value){
       $req="INSERT INTO attendance (hall_ticket,department,attendance) 
       values ('".$hall. "','". $departement ."' ,'". $value ."')";
       $insertAttendance=mysqli_query($dataBaseConnect,$req);               
 }

如何使用foreach循环更新MYSQL中的数据

2 个答案: