Nette\Database\Context::getInsertId PHP Method

    public function getInsertId($name = NULL)
    {
        return $this->connection->getInsertId($name);
    }

 public function add($vals)
 {
     $arr = array("titulek" => $vals['titulek'], "autor" => $vals["autor"], "kategorie_id" => $vals['kategorie_id'], "obrazek_id" => $vals['obrazek_id']);
     if (!empty($vals['skupina'])) {
         $arr['skupina'] = $vals['skupina'];
     }
     if (empty($vals['id'])) {
         $this->database->query("INSERT INTO clanky ", $arr);
         $id = $this->database->getInsertId();
     } else {
         $this->database->query("UPDATE clanky SET ", $arr, " WHERE id=?", $vals['id']);
         $id = $vals['id'];
     }
     $arr = array("clanek_id" => $id, "perex" => $vals['perex'], "text" => $vals['text']);
     $this->database->query("INSERT INTO clanky_revize", $arr);
     $this->database->query("DELETE FROM stitky WHERE clanek_id=?;", $id);
     $stitky = explode("\n", $vals['stitky_text']);
     foreach ($stitky as $key => $stitek) {
         if (empty($stitek)) {
             continue;
         }
         $stitky[$key] = trim($stitek);
     }
     $stitky = array_unique($stitky);
     foreach ($stitky as $stitek) {
         $this->database->query("INSERT INTO stitky ", array("clanek_id" => $id, "stitek" => trim($stitek)));
     }
     return $id;
 }