php - 根据另一个表逐步更新一个表

标签 php mysql

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以上是我画的一个方案。有一个理想的情况，当 content.user被分组。但通常他们不分组。 我在这个方案中的意思是:

  1. 第一步，我选择users.monetos哪里 users.id = content.user

  2. 在第二步，我递减 users.monetos与每个 content.cpc值(2.1，2.2)

模拟时: 选择content.user (9)

选择users.monetos哪里users.id=content.users (15)

所以我们有 15 个值 users.monetos对于 users.id=9 ，现在我们回到内容表 和:

  1. 将 15 值减 8 ( content.cpc ) (15-8=7> 0 -> 转到步骤 2)
  2. 将 7(上一步的结果)减 10 ( content.cpc ) (7-10=-3 <0 -> 更新 content set active='0' where content.id= (获得否定结果时的当前 id) )

对于每个 content.user 都是这样

更多扩展 - 我想选择contet.*具有 content.active 的行= 1 (n)。有了这些数据，SELECT users.monetos哪里 users.id =content.user来自之前的查询。 现在，按最大 (n) 步数递减 users.monetos按 content.cpc 值计算的值 当 **users.monetos=0 或小于 0 时，我想更新 content并设置事件='0'**

言下之意，我想分享每个内容条目的users.monetos金额(每个content.cpc)。并且不再有 users.monetos 构成当前的 content 条目无效。对每个 content.user 执行此操作 我此时所做的如下所示。我现在看起来很糟糕，但我已经不知道该怎么办了。指望你们。谢谢。

$query = "select content.id, content.cpc, conent.user, content.active from content a
join users b on a.user=b.id
group by b.id where a.active='1'";

/** cycle each user **/
foreach($rows = $connector->fetchArray($query) as $row ) {
    $monetos = $row['monetos'];
    $query = "select id, cpc from content where user={$row['id']}";
    /** cycle each users content **/
    foreach($contents = $connector->fetchArray($query) as $content) {
        echo $monetos;
        $monetos -= $content['cpc'];
        if($monetos <= 0) {
            $disable[] = $content['id'];
        }
    }
    if( isset($disable) ) {
        $connector->query("update content set active='0' where id in(".implode(',',$disable).")");
    }
}

最佳答案

通过使用 GROUP_CONCAT，我们将 ID 和 CPC 进行分组，并用逗号分隔以供以后使用，并使用 GROUP BY 用户 ID 我们将获得每个用户的单行结果。

在 foreach 上，我们从 MONETOS 推导出每个 CPC，并从那里我们将需要禁用的人员设置为 $ to_disable 数组，稍后用于禁用所有需要的 id。

$query = "SELECT b.id AS user_id,
                 b.monetos,
                 GROUP_CONCAT(a.id ORDER BY a.id DESC) AS content_ids, 
                 GROUP_CONCAT(a.cpc ORDER BY a.id DESC) AS cpc,
            FROM content a
            JOIN users b 
              ON a.user = b.id
        GROUP BY b.id";

$to_disable = array();
$to_enable = array();
foreach($rows = $connector->fetchArray($query) as $row)
{
    $monetos = $row['monetos'];
    $data = array_combine(explode(',',$row['content_ids']), explode(',',$row['cpc']));
    echo "USER {$row['user_id']} currently have {$monetos}!<br>\n";
    foreach ($data as $content_id => $cpc)
    {
        $monetos -= $cpc;
        echo "USER {$row['user_id']} after CONTENT {$content_id} now have {$monetos}!<br>\n";
        if ($monetos <= 0)
        {
            echo "USER {$row['user_id']} should have the CONTENT {$content_id} disabled!<br>\n";
            $to_disable[] = $content_id;
        }
        else
        {
            echo "USER {$row['user_id']} should have the CONTENT {$content_id} enabled!<br>\n";
            $to_enable[] = $content_id;
        }
    }
    echo "<br>\n";
}

if (sizeof($to_disable) > 0)
{
    $connector->query("UPDATE content 
                          SET active = 0
                        WHERE id IN (".implode(',',$to_disable).")");
}
echo "UPDATE content SET active = 0 WHERE id IN (".implode(',',$to_disable).")<br>\n";

if (sizeof($to_enable) > 0)
{
    $connector->query("UPDATE content 
                          SET active = 1
                        WHERE id IN (".implode(',',$to_enable).")");
}
echo "UPDATE content SET active = 0 WHERE id IN (".implode(',',$to_enable).")";
<小时/>

使用你的 SQL 转储，这就是我得到的:

USER 9 currently have 15!
USER 9 after CONTENT 16 now have 10!
USER 9 after CONTENT 30 now have 5!
USER 9 after CONTENT 17 now have 4!
USER 9 after CONTENT 31 now have -1!
USER 9 should have the CONTENT 31 disabled!
USER 9 after CONTENT 18 now have -4!
USER 9 should have the CONTENT 18 disabled!
USER 9 after CONTENT 32 now have -9!
USER 9 should have the CONTENT 32 disabled!
USER 9 after CONTENT 20 now have -13!
USER 9 should have the CONTENT 20 disabled!
USER 9 after CONTENT 33 now have -18!
USER 9 should have the CONTENT 33 disabled!
USER 9 after CONTENT 21 now have -22!
USER 9 should have the CONTENT 21 disabled!
USER 9 after CONTENT 34 now have -26!
USER 9 should have the CONTENT 34 disabled!
USER 9 after CONTENT 22 now have -31!
USER 9 should have the CONTENT 22 disabled!
USER 9 after CONTENT 24 now have -36!
USER 9 should have the CONTENT 24 disabled!
USER 9 after CONTENT 26 now have -41!
USER 9 should have the CONTENT 26 disabled!
USER 9 after CONTENT 29 now have -45!
USER 9 should have the CONTENT 29 disabled!

USER 10 after CONTENT 28 now have 95!

USER 11 after CONTENT 27 now have -4!
USER 11 should have the CONTENT 27 disabled!

以及更新结果:

UPDATE content SET active = 0 WHERE id IN (31,18,32,20,33,21,34,22,24,26,29,27)

这是用于按原样读取数据的示例代码:

<?php    
// Your database info
$db_host = '';
$db_user = '';
$db_pass = '';
$db_name = '';

$con = new PDO("mysql:host={$db_host};dbname={$db_name}", $db_user, $db_pass);
$con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = "SELECT b.id AS user_id,
               b.monetos,
               GROUP_CONCAT(a.id ORDER BY a.id DESC) AS content_ids, 
               GROUP_CONCAT(a.cpc ORDER BY a.id DESC) AS cpc
          FROM content a
          JOIN users b 
            ON a.user = b.id
      GROUP BY b.id";
$result = $con->prepare($sql);
$result->execute();

if ($result->rowCount() == 0)
{
    die('No data found...');
}

$to_disable = array();
$to_enable = array();
foreach($result->fetchALL(PDO::FETCH_ASSOC) as $row)
{
    $monetos = $row['monetos'];
    $data = array_combine(explode(',',$row['content_ids']), explode(',',$row['cpc']));
    echo "USER {$row['user_id']} currently have {$monetos}!<br>\n";
    foreach ($data as $content_id => $cpc)
    {
        $monetos -= $cpc;
        echo "USER {$row['user_id']} after CONTENT {$content_id} now have {$monetos}!<br>\n";
        if ($monetos <= 0)
        {
            echo "USER {$row['user_id']} should have the CONTENT {$content_id} disabled!<br>\n";
            $to_disable[] = $content_id;
        }
        else
        {
            echo "USER {$row['user_id']} should have the CONTENT {$content_id} enabled!<br>\n";
            $to_enable[] = $content_id;
        }
    }
    echo "<br>\n";
}

if (sizeof($to_disable) > 0)
{
    $ids = implode(',',$to_disable);
    $sql = "UPDATE content 
               SET active = 0
             WHERE id IN ({$ids})";
    $disable = $con->prepare($sql);
    $disable->execute();
    echo "UPDATE content SET active = 0 WHERE id IN ({$ids})<br>\n";
}
else
{
    echo "Nothing was disabled...<br>\n";
}

if (sizeof($to_enable) > 0)
{
    $ids = implode(',',$to_enable);
    $sql = "UPDATE content 
               SET active = 1
             WHERE id IN ({$ids})";
    $enable = $con->prepare($sql);
    $enable->execute();
    echo "UPDATE content SET active = 1 WHERE id IN ({$ids})";
}
else
{
    echo "Nothing was enabled...";
}
$con = NULL;

关于php - 根据另一个表逐步更新一个表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22614306/

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