PDO不获取任何结果

我直接在index.php文件中使用PDO查询。现在我想创建一个单独的文件来存储函数。我创建了一个，但当我调用函数时只返回"0"。旧版本作品：

$abfrage11 = "SELECT COUNT(e.event_id) as numgoals
FROM event e 
WHERE (e.match_id = '$row1->match_id' AND e.team_id = '$row1->team_a_id' AND e.eventtype IN ('soc_G','soc_PG') ) OR
      (e.match_id = '$row1->match_id' AND e.team_id = '$row1->team_b_id' AND e.eventtype = 'soc_OG' )";
$ergebnis11 = $dbh->query($abfrage11);
$row11 = $ergebnis11->fetch(PDO::FETCH_OBJ);

新版本中的BUt不是：

单独的文件"storage.php"：

class StorageAccess
{
    /** @var  PDO */
    public $db;
    /**
     * @param $db
     */
    public function __construct($db)
    {
        $this->db = $db;
    }
public function getAbfrage11()
    {
        $query = "SELECT COUNT(e.event_id) as numgoals
                    FROM event e 
                    WHERE (e.match_id = :mId AND e.team_id = :tmA AND e.eventtype IN ('soc_G','soc_PG') ) OR
                          (e.match_id = :mId2 AND e.team_id = :tmB AND e.eventtype = 'soc_OG' )";
        $statement = $this->db->prepare($query);
        $statement->execute([
            ':mId' => $row1->match_id,
            ':mId2' => $row1->match_id,
            ':tmA' => $row1->team_a_id,
            ':tmB' => $row1->team_b_id,
        ]);
        return $statement->fetchObject();
    }
}

调用index.php:

require_once("dblogin.php");
require_once("Storage.php");
$dbFactory = new RepositoriesFactory();
$dbh = $dbFactory->getDataBaseInstance('admgsa_gsa');
$storage_access = new StorageAccess($dbh);
$row11 = $storage_access->getAbfrage11();
echo "<span class='live-monitor-8' style='"$goalscbgcolor'">$row11->numgoals</span>";

尝试搜索解决方案，但找不到任何内容。感谢您提前提供帮助。