How to get values from my object model and display my banner on header in Prestashop - orm

Question

I developed a custom multi-banner module to display on the header of my prestashop page. When i save my changes on form i would like to display it on header.
My module form:
My table to see all banner inserted:
I tried to use smarty and orm to retrieve all information but i don't know how to display on my header.
Any issues? I hope i can understand my trobles :)
Thanks
Here's the code of some of my files:
//in main file:
public function hookDisplayHeaderBanner($params) {
$banner = Banner::getBannerToDisplay();
// If there is a banner to display
if ($banner) {
$this->context->smarty->assign([
'banner' => $banner
]);
return $this->display(__FILE__, 'views/templates/hook/display-custom-banner.tpl');
}
// Nothing to display
return false;
}
//In classes/Banner.php
class Banner extends ObjectModel
{
public $id;
public $color;
public $background_color;
public $content;
public static $definition = [
'table' => 'custom_banner',
'primary' => 'id_custom_banner',
'multilang' => false,
'fields' => [
'color' => [
'type' => self::TYPE_STRING,
],
'background_color' => [
'type' => self::TYPE_STRING,
],
'content' => [
'type' => self::TYPE_STRING
]
]
];
/*
*
* Return the banner to display
*
* Here we put the logic to select the right banner
*/
public static function getBannerToDisplay()
{
$sql = 'SELECT *
FROM `' . _DB_PREFIX_ . self::$definition['table'] . '`
WHERE active = 1';
return Db::getInstance()->getRow($sql);
}
}
//In display-custom-banner.tpl
<div id="banner" style="background-color:{$banner.background_color}!important;">
<p style="color:{$banner.color}!important;">
{$banner.content}
</p>
</div>

Answer 1

Using:
return Db::getInstance()->getRow($sql);
only retrieve the first row of the result, if you would like to return more than one banner you would like to use Db::getInstance()->executeS($sql); to get all results.
Also check your DB table structure and a var_dump() of the involved variables, this would help understanding if there are more issues.