如何在 LIMIT 子句中应用 bindValue 方法?

问题描述

这是我的代码的快照:

$fetchPictures = $PDO->prepare("SELECT * 
    FROM pictures 
    WHERE album = :albumId 
    ORDER BY id ASC 
    LIMIT :skip, :max");

$fetchPictures->bindValue(':albumId', $_GET['albumid'], PDO::PARAM_INT);

if(isset($_GET['skip'])) {
    $fetchPictures->bindValue(':skip', trim($_GET['skip']), PDO::PARAM_INT);    
} else {
    $fetchPictures->bindValue(':skip', 0, PDO::PARAM_INT);  
}

$fetchPictures->bindValue(':max', $max, PDO::PARAM_INT);
$fetchPictures->execute() or die(print_r($fetchPictures->errorInfo()));
$pictures = $fetchPictures->fetchAll(PDO::FETCH_ASSOC);

我明白了

您的 SQL 语法有错误；检查对应的手册您的 MySQL 服务器版本在 ''15', 15' 附近使用的正确语法第 1 行

似乎 PDO 在 SQL 代码的 LIMIT 部分为我的变量添加了单引号.我查了一下我发现了这个我认为相关的错误:http://bugs.php.net/bug.php?id=44639

It seems that PDO is adding single quotes to my variables in the LIMIT part of the SQL code. I looked it up I found this bug which I think is related:http://bugs.php.net/bug.php?id=44639

这就是我在看的吗?这个bug从2008年4月就被打开了！在此期间我们应该做什么?

Is that what I'm looking at? This bug has been opened since April 2008!What are we supposed to do in the meantime?

我需要建立一些分页，并且需要在发送 sql 语句之前确保数据是干净的、sql 注入安全的.

I need to build some pagination, and need to make sure the data is clean, sql injection-safe, before sending the sql statement.

推荐答案

我记得以前有过这个问题.在将值传递给绑定函数之前将其转换为整数.我认为这可以解决问题.

I remember having this problem before. Cast the value to an integer before passing it to the bind function. I think this solves it.

$fetchPictures->bindValue(':skip', (int) trim($_GET['skip']), PDO::PARAM_INT);

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