FOUND_ROWS() 不断返回 0

问题描述

$result = $db_con->query("SELECT SQL_CALC_FOUND_ROWS * FROM users LIMIT 0,10");

$count_result = $db_con->query("SELECT FOUND_ROWS() as totalcount");
$row = $count_result->fetch_assoc();
$total = $row['totalcount'];

即使 $result 包含其中的所有用户行，$total 仍然返回 0.

$total keeps returning 0 even though the $result contains all the user rows in it.

ini_set("mysql.trace_mode", "0");

我通过在此处搜索类似的 Q 发现了此设置，但它没有解决我的问题.

I found out about this setting via searching a similar Q on here, but it did not resolve my issue.

当我在 MySQL 客户端中使用 2 个 select 语句时，它总是输出正确的计数.只是似乎无法弄清楚如何让它在我的 php 页面上工作.

When I use the 2 select statements in my MySQL client it always outputs the right count. Just can't seem to figure out how to get it working on my php page.

PHP 版本:5.2.5 构建 6MySQL 版本:5.1.30

PHP Version: 5.2.5 build 6 MySQL Version: 5.1.30

注意:我在此处提供的代码并未在我的实际项目中使用，但是，它确实体现了我无法检索总数的问题.这段代码，从我读过的关于 found_rows() 的内容来看，应该可以工作，但没有.

Note: The code I provided here is not being used on my actual project, however, it does exemplify the problem I am having with not being able to retrieve the total count. This code, from what I've read about found_rows(), should work but it doesn't.

推荐答案

在 php.net 上，我发现有人可能遇到了同样的问题.他说的是可能发生的竞争条件:php.net.基本上他通过以减慢速度为代价临时锁定表来解决这个问题.

On php.net I found someone with maybe the same problem. He is speaking of a race condition that could occur: php.net. Basically he solves this problem by temporary locking the table at the cost of slowing things down.

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