Issue when trying to use IN() in wpdb

问题:

i have this:

$villes = '"paris","fes","rabat"';
$sql    = 'SELECT distinct telecopie FROM `comptage_fax` WHERE `ville` IN(%s)';
$query  = $wpdb->prepare($sql, $villes);

when I do an echo $query; i get:

SELECT distinct telecopie FROM `comptage_fax` WHERE `ville` IN('\"CHAPELLE VIVIERS \",\"LE MANS \",\"QUEND\"')

the probleme i have is that $wpdb add ' in IN('...')

can someone help, thanks

回答1:

Try this code (FIXED):

// Create an array of the values to use in the list
$villes = array("paris", "fes", "rabat");    

// Generate the SQL statement.
// The number of %s items is based on the length of the $villes array
$sql = "
  SELECT DISTINCT telecopie
  FROM `comptage_fax`
  WHERE `ville` IN(".implode(', ', array_fill(0, count($villes), '%s')).")
";

// Call $wpdb->prepare passing the values of the array as separate arguments
$query = call_user_func_array(array($wpdb, 'prepare'), array_merge(array($sql), $villes));

echo $query;

• implode()
• array_fill()
• call_user_func_array()
• array_merge()

回答2:

WordPress already has a function for this purpose, see esc_sql(). Here is the definition of this function:

Escapes data for use in a MySQL query. Usually you should prepare queries using wpdb::prepare(). Sometimes, spot-escaping is required or useful. One example is preparing an array for use in an IN clause.

You can use it like this:

$villes = ["paris", "fes", "rabat"];
$villes = array_map(function($v) {
    return "'" . esc_sql($v) . "'";
}, $villes);
$villes = implode(',', $villes);
$query = "SELECT distinct telecopie FROM `comptage_fax` WHERE `ville` IN (" . $villes . ")"

回答3:

FUNCTION:

function escape_array($arr){
    global $wpdb;
    $escaped = array();
    foreach($arr as $k => $v){
        if(is_numeric($v))
            $escaped[] = $wpdb->prepare('%d', $v);
        else
            $escaped[] = $wpdb->prepare('%s', $v);
    }
    return implode(',', $escaped);
}

USAGE:

$arr = array('foo', 'bar', 1, 2, 'foo"bar', "bar'foo");

$query = "SELECT values
FROM table
WHERE column NOT IN (" . escape_array($arr) . ")";

echo $query;

RESULT:

SELECT values
FROM table
WHERE column NOT IN ('foo','bar',1,2,'foo\"bar','bar\'foo')

May or may not be more efficient, however it is reusable.

回答4:

The prepare function also takes an array as the second parameter.

You can try converting $villes like this:

Current

<?php
$villes = '"paris","fes","rabat"';
?

Change it to

<?php
$villes = array("paris","fes","rabat");
?>

Now, try passing $villes to the prepare func and see if it works. Hope it helps.