Question

我有一个while循环，可以跟踪两个变量，并在条件通过或失败时将其递增。它肯定是递增的，但是它显示了递增的每次迭代。我只想在while循环结束后显示这些值。我知道我需要关闭循环然后显示值，但是我无法发生这种情况，因为我需要HTML为多个用户显示多次。我想知道如何让HTML多次显示，但每个用户只显示两个变量。

$addedItem = $tradedItem = 0;
$sql = "SELECT DISTINCT adminid, log_operation FROM item_log_table WHERE timestamp BETWEEN '$time' and '$time2' ORDER BY adminid ASC";
$result = $db->prepare($sql);
$result->execute();
while ($row = $result->fetch()) {
    $username = $functions->getUserInfoSingularFromId('username', $row['adminid']);
    $lastLogin = $functions->getUserInfoSingularFromId('previous_visit', $row['adminid']);
    $lastLogin = $adminfunctions->displayDate($lastLogin);

    if ($row['log_operation'] == "ADDED ITEM") {
        $addedItem += 1;
    } else {
        $tradedItem += 1;
    } ?>

    <div class="row">
        <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12" style="border-radius: 16px; margin-top: 25px;">
            <div class="well profile col-lg-12 col-md-12 col-sm-12 col-xs-12">
                <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 text-center">
                    <p style="text-align:center;font-size: smaller;"><strong>Name | Employee: </strong><span class="tags" id="user-status"><?php echo $username; ?> | <?php echo $row['adminid']; ?></span></p>
                    <p style="text-align:center;font-size: smaller;"><strong>Date Last Logged In: </strong><span class="tags" id="user-status"> <?php echo $lastLogin; ?></span></p>

                    <div class="col-lg-6 left" style="text-align:center;overflow-wrap: break-word;">
                        <h4><p style="text-align: center;"><strong id="user-globe-rank"><?php echo $addedItem; ?></strong></p></h4>
                        <p><small class="label label-success">Items Added</small></p>                    
                     </div>
                     <div class=" col-lg-6 left" style="text-align:center;overflow-wrap: break-word;">
                         <h4><p style="text-align: center;"><strong id="user-college-rank"><?php echo $tradedItem; ?></strong></p></h4>
                         <p> <small class="label label-warning">Items Traded</small></p>
                     </div>
                 </div>
             </div>
         </div>
     </div>
<?php } ?>

What it looks like in the loop

我只希望它显示每个用户的$ addedItem和$ tradedItem的最后一次迭代。另外，请原谅我只是在制作原型的样式属性。

Answer 1

由于您使用的是DISTINCT，因此您将仅为adminid为log_operation的{{1}}检索一条记录。

例如，如果您的表具有：

ADDED ITEM

您的查询将只检索

| adminid | log_operation  |
| 1       |  ADDED ITEM    |
| 1       |  ADDED ITEM    |
| 1       |  TRANSFER ITEM |
| 2       |  ADDED ITEM    |

要解决此问题并总计adminid的所有log_operations ADDED ITEM，请对期望的adminid值使用聚合函数。

log_operation

这将为每个adminid检索一行，其日志操作总数为SELECT adminid, SUM(CASE log_operation WHEN 'ADDED ITEM' THEN 1 ELSE 0 END) AS addedItems, SUM(CASE log_operation WHEN 'ADDED ITEM' THEN 0 ELSE 1 END) AS tradedItems FROM item_log_table WHERE `timestamp` BETWEEN '$time' AND '$time2' GROUP BY adminid ORDER BY adminid ASC，而不是。

示例：https://www.db-fiddle.com/f/muAESWHphmaBheZmf9wZWy/1

ADDED ITEM

然后只需在html中检索这些列即可。

| adminid | addedItems | tradedItems |
| 1       |  2         | 1           |
| 2       |  1         | 0           |

如何仅在while循环中显示一次值，但如何显示html循环的长度

1 个答案:

示例：https://www.db-fiddle.com/f/muAESWHphmaBheZmf9wZWy/1