Wordpress wpdb没有从数据库获得结果

Question

Hi guys I'm sure I'm missing something but I can't figure out why this is not working! So I have a table and some data, and I'm trying to get the image column, but for some reason, it's not working.

This is what I'm getting (empty url):

<div class="forma_reservas_datos_imagen imgPack" style="background-image:url()"></div>

PHP

<?php 

global $wpdb;

$tablePacks = 'packs';

$res =  "SELECT * FROM ".$tablePacks." where nom_pack_get = '".$_GET["pack"]."'";

$packImg = $wpdb->get_results($res, ARRAY_A);

if(count($packImg) == 1){
    ?>
    <div class="forma_reservas_datos_imagen imgPack" style="background-image:url(<?php echo $packImg->imatge_url; ?>)">
<?php   

}

?>

Answer 1

$packImg will be an array of associative arrays, no an object, so you should use it as $packImg[0]["imatge_url"].

As others have pointed out in the comments, watch out for SQL injections. Use wpdb's prepare method:

$res = $wpdb->prepare("SELECT * FROM ".$tablePacks." where nom_pack_get = %s", $_GET["pack"]);

prepare will return SQL that is safe to send to the database (and you don't have to type '" . $myvar . "' all the time, it really helps a lot, and makes your code secure at the same time).