动态更改PDO语句中的列名 [英] Dynamically change column name in PDO statement

问题描述

是否可以在准备好的MySQL语句中将列名作为参数传递?请看以下示例:

Is it possible pass a column name as parameter in a prepared MySQL statement? Take the following example:

UPDATE Images
SET :placement = :imageURL
WHERE ID = :titleID;

PDO在每个参数周围添加'，因此上方的中线变为:

PDO adds ' around each parameter, so the middle line above becomes:

SET 'Homepage' = '1.jpg'

哪个MySQL不喜欢.有没有一种方法可以在PDO语句中包含字段名的参数并接受它们?

Which MySQL doesn't like. Is there a way to include parameters for fieldnames in PDO statements and have them accepted?

否则，我猜我将不得不编写一些不同的PDO语句，这取决于所选择的内容(?).

Otherwise I guess I'll have to write several different PDO statements, depending on what's been chosen(?).

推荐答案

您将需要执行以下操作:

You would need to do something like this:

$column = 'someColumn';

$stmt = $db->prepare("UPDATE tableName SET {$column} = :columnValue WHERE ID = :recordId");

参数化占位符仅用于值.

Parameterized placeholders are only for values.

我建议您阅读问题上发表的@YourCommonSense评论.

I would suggest you read the comment @YourCommonSense posted on your question.

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