PHP PDO prepared statement IN() array [duplicate]

问题

From the PHP Manual :

You cannot bind multiple values to a single named parameter in, for example, the IN() clause of an SQL statement.

But can you use multiple values using question mark parameter markers? Or do you have to prepare() a new statement every time the number of values changes?

SELECT * FROM `table` WHERE `column` IN(?)

If this is allowed how do you make it work?

EDIT: The two previous questions indicated were both about named variables, which the manual says can't be bound to multiple parameters. I was asking about question mark (anonymous) variables.

回答1:

Here's some code I whipped up to simulate the desired outcome:

<?php
function preprepare(&$query, &$data) {
    preg_match_all('/\?/', $query, $matches, PREG_OFFSET_CAPTURE);
    $num = count($matches[0]);
    for ($i = $num; $i;) {
        --$i;
        if (array_key_exists($i, $data) && is_array($data[$i])) {
            $query = substr_replace($query, implode(',', array_fill(0, count($data[$i]), '?')), $matches[0][$i][1], strlen($matches[0][$i][0]));
            array_splice($data, $i, 1, $data[$i]);
        }
    }
}

$query = 'SELECT * FROM `table` WHERE `col1` = ? AND `col2` IN(?) AND `col3` = ? AND `col4` IN(?)';
$data = array('foo', array(1, 2, 3), 'bar', array(4, 2));
preprepare($query, $data);
var_dump($query, $data);
?>

It outputs:

array (size=2)
  0 => string 'SELECT * FROM `table` WHERE `col1` = ? AND `col2` IN(?,?,?) AND `col3` = ? AND `col4` IN(?,?)' (length=93)
  1 => 
    array (size=7)
      0 => string 'foo' (length=3)
      1 => int 1
      2 => int 2
      3 => int 3
      4 => string 'bar' (length=3)
      5 => int 4
      6 => int 2

The query and data can then be used in a normal PDO prepared statement. I don't know if it accounts for all PDO magic niceness but it works pretty well so far.

来源：https://stackoverflow.com/questions/21763224/php-pdo-prepared-statement-in-array

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php

pdo

prepared-statement