PDO 多次获取同一查询

PDO multiple fetching of same query(PDO 多次获取同一查询)

问题描述

我正在使用 PDO::FETCH_ASSOC 从数据库中获取结果.问题是我在同一个文件中做了两次.这是一个已知问题吗?替代方案是什么?

I am fetching the results from a db with PDO::FETCH_ASSOC. The issue is that I am doing it twice in the same file. Is that a known issue? What would be the alternative?

这是我的代码:

FIRST TIME

while($row = $ordersQuery->fetch(PDO::FETCH_ASSOC)) 
        {
            $totalAmount += $row['clientPrice']/100; 
        }
        echo $totalAmount;

SECOND TIME

    while($row = $ordersQuery->fetch(PDO::FETCH_ASSOC)) 
            {
    ....
    }

每当我删除第一个提取时，第二个都可以正常工作.如果我有两个，第二个不会返回任何东西.

Whenever I remove the first fetching, the second works fine. If I have both, the second does not return anything.

谢谢！

推荐答案

你不能像这样从数据库中多次获取.改为这样做:

You can't fetch from the DB multiple times like this. Do this instead:

$orders = $ordersQuery->fetchAll(PDO::FETCH_ASSOC);

...

foreach ($orders as $val) {
    // stuff 1
}

...

foreach ($orders as $val) {
    // stuff 2
}

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