php一次更新所有mysql行，但我一次只能更新一个

Question

我在php页面中添加了一个功能，当我按下“提交”按钮时，“已确认”列的值从0更改为1，但是它一次更改了每条记录的“已确认”值，而我只想对一条记录执行此操作时间，并且记录具有唯一的销售ID。

代码：

<?php
                    $conn = $pdo->open();

                    try{
                      $stmt = $conn->prepare("SELECT *, sales.id AS salesid FROM sales LEFT JOIN users ON users.id=sales.user_id ORDER BY sales_date DESC");
                      $stmt->execute();
                      foreach($stmt as $row){
                        $stmt = $conn->prepare("SELECT * FROM details LEFT JOIN products ON products.id=details.product_id WHERE details.sales_id=:id");
                        $stmt->execute(['id'=>$row['salesid']]);
                        $total = 0;
                        foreach($stmt as $details){
                          $subtotal = $details['price']*$details['quantity'];
                          $total += $subtotal;
                        }
                        if($row['Confirmed'] == 0){
                        echo "
                          <tr>
                            <td class='hidden'></td>
                            <td>".date('M d, Y', strtotime($row['sales_date']))."</td>
                            <td>".$row['firstname'].' '.$row['lastname']."</td>
                            <td>".$row['country'].' , '.$row['city']." , ".$row['address']."</td>
                            <td width='25px;'>&#8378; ".number_format($total, 2)."</td>
                            <td width='18px;'><button type='button' class='btn btn-info btn-sm btn-flat transact' data-id='".$row['salesid']."'><i class='fa fa-search'></i> View</button></td>
                            <form action='' method='post'>
                            <td width='18px;'>
                            <input type='hidden' name='confirm' value='1'> <input class='btn btn-success btn-sm btn-flat' type='submit' value='Confirm'>
                            </td>
                            </form>
                          </tr>
                         
                        ";
                        if(isset($_POST['confirm']) && $_POST['confirm'])
                        {
                          $stmt = $conn->prepare("UPDATE sales SET Confirmed = 1 WHERE id = '".$row['salesid']."'");                                                         
                          $stmt->execute();  
                          echo "<meta http-equiv='refresh' content='0'>";                    
                        }
                        }
                      }
                    }
                    catch(PDOException $e){
                      echo $e->getMessage();
                    }

                    $pdo->close();                    
                  ?>