我可以将数组绑定到 IN() 条件吗? [英] Can I bind an array to an IN() condition?

问题描述

我很想知道是否可以使用 PDO 将一组值绑定到占位符.这里的用例是尝试传递一组用于 IN() 条件的值.

I'm curious to know if it's possible to bind an array of values to a placeholder using PDO. The use case here is attempting to pass an array of values for use with an IN() condition.

我希望能够做这样的事情:

I'd like to be able to do something like this:

<?php
$ids=array(1,2,3,7,8,9);
$db = new PDO(...);
$stmt = $db->prepare(
    'SELECT *
     FROM table
     WHERE id IN(:an_array)'
);
$stmt->bindParam('an_array',$ids);
$stmt->execute();
?>

并让 PDO 绑定并引用数组中的所有值.

And have PDO bind and quote all the values in the array.

目前我正在做:

<?php
$ids = array(1,2,3,7,8,9);
$db = new PDO(...);
foreach($ids as &$val)
    $val=$db->quote($val); //iterate through array and quote
$in = implode(',',$ids); //create comma separated list
$stmt = $db->prepare(
    'SELECT *
     FROM table
     WHERE id IN('.$in.')'
);
$stmt->execute();
?>

这当然可以完成工作，但只是想知道是否有我缺少的内置解决方案?

Which certainly does the job, but just wondering if there's a built in solution I'm missing?

推荐答案

您必须构造查询字符串.

You'll have to construct the query-string.

<?php
$ids     = array(1, 2, 3, 7, 8, 9);
$inQuery = implode(',', array_fill(0, count($ids), '?'));

$db = new PDO(...);
$stmt = $db->prepare(
    'SELECT *
     FROM table
     WHERE id IN(' . $inQuery . ')'
);

// bindvalue is 1-indexed, so $k+1
foreach ($ids as $k => $id)
    $stmt->bindValue(($k+1), $id);

$stmt->execute();
?>

Chris(评论)和someoneisintroble 都建议foreach 循环......

Both chris (comments) and somebodyisintrouble suggested that the foreach-loop ...

(...)
// bindvalue is 1-indexed, so $k+1
foreach ($ids as $k => $id)
    $stmt->bindValue(($k+1), $id);

$stmt->execute();

... 可能是多余的，所以 foreach 循环和 $stmt->execute 可以只替换为 ...

... might be redundant, so the foreach loop and the $stmt->execute could be replaced by just ...

<?php 
  (...)
  $stmt->execute($ids);

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