Question

我有一个捐赠网站，并且有点坚持找到当前捐赠的捐赠目标的百分比？

在我的MySQLi数据库中，我有两列 - donation_goal（数字例如500）和current_raised（数字例如20.00）。

我需要做的是查找并显示捐赠目标中目前已提高的百分比。因此，如果捐赠10英镑并且目标是100英镑，它将显示10％。但是每次加载页面都会这样做。

我使用下面的代码显示每个页面，并且需要找到一种方法将此功能添加到以下代码中：

<?php


$sql = "SELECT * FROM pages ORDER BY RAND() LIMIT 3";

$result = mysqli_query($mysqli,$sql)or die(mysqli_error());

while($row = mysqli_fetch_array($result)) {
    $page_name = $row['page_name'];
    $count = strlen($page_name);
    if($count < 27){
        $space = '<br> <br/>';
    } else {
        $space = '';
    }
    $page_dp = $row['page_dp'];
    $donation_goal = $row['donation_goal'];
    $current_raised = $row['current_raised'];


?>

  <div class="col-sm-6 col-md-4">
    <div class="thumbnail">
      <img src="pageimg/<? echo $page_dp; ?>" style="width:348px;height:233px;" alt="Page Image">
      <div class="caption">
        <h3><? echo $page_name; ?> <? echo $space; ?></h3>
        <div class="progress">
  <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100" style="width: 10%">10%
    <span class="sr-only">10% Complete (success)</span>
  </div>
</div>
        <p><b>£<? echo $donation_goal; ?>.00</b> Target | <b>£<? echo $current_raised; ?></b> Raised</p>
        Here is a little info about this current topic, please help us raise more than we can! We need your help!
        <p><a href="#" class="btn btn-success" role="button">Donate Now</a> <a href="#" class="btn btn-default" role="button">Details</a></p>
      </div>
    </div>
  </div>



<?
} 
?>

我尝试将此代码添加到混音中，但收到错误，所以我很确定我不知道如何正确添加它：

$sql = "SELECT * FROM pages, COUNT( current_raised ) AS test, concat(round(( current_raised/donation_goal * 100 ),2),'%') AS percentage ORDER BY id DESC LIMIT 3";

这只是给出了错误。有关如何使用短代码高效执行此操作的任何想法？

Answer 1

如果您想从目标中计算出目标的百分比，可以直接在查询中执行此操作：

SELECT page_dp, 
       donation_goal, 
       current_raised, 
       ROUND(current_raised/donation_goal*100) percentage 
FROM pages 
ORDER BY RAND() 
LIMIT 3

然后你只需输出循环中的百分比：

<span class="sr-only"><?php print $row['percentage']; ?>% Complete (success)</span>

Answer 2

这是你想要的吗？

SELECT p.*, pc.cr / donation_goal
FROM pages p CROSS JOIN
     (SELECT SUM(current_raised) as cr FROM pages) pc
ORDER BY RAND()
LIMIT 3;

MySQL计算捐赠总额的百分比

2 个答案: