public function jsonRows()
    {
        $arrWhat = array_values($this->getHeaderColumns());
        $arrWhere = [];
        $arrOrder = ['`id` DESC'];
        $start = 0;
        $pageSize = 15;
        if (isset($_POST['page']) && isset($_POST['pageSize'])) {
            $page = (int) $_POST['page'];
            $pageSize = (int) $_POST['pageSize'];
            $start = $page * $pageSize;
        }
        if (isset($_POST['sort']) && isset($_POST['sortDir'])) {
            $sort = (string) $_POST['sort'];
            $sortDir = (string) $_POST['sortDir'];
            if (!in_array($sortDir, ['ASC', 'DESC'])) {
                throw new Exception('Someone is doing something evil here :(');
            }
            if (!in_array($sort, $this->getAllowedPostColumns())) {
                throw new Exception('Someone is doing something evil here :(');
            }
            $arrOrder = ['`'.$sort.'` '.$sortDir];
        }
        foreach ($arrWhat as $filter) {
            if (in_array($filter, $arrWhat) && isset($_POST['filter_'.$filter])) {
                $arrWhere[$filter] = [
                    "operator" => "like",
                    "value" => '%'.$_POST['filter_'.$filter].'%'
                ];
            }
        }
        
        $arrLimit = [$start, $pageSize];
        $rows = $this->loadByPrepStmt($arrWhat, $arrWhere, $arrOrder, $arrLimit);
        if (count($rows) < 1) {
            return "[]";
        }
        foreach ($rows as $key => $columns) {
            foreach ($columns as $cKey => $column) {
                if ($cKey == "createDate") {
                    $rows[$key][$cKey] = strftime("%d.%m.%Y %H:%M:%S", strtotime($column));
                }
            }
            $rows[$key]['actions'] = $this->renderActionLinks();
        }
        $json = json_encode($rows, JSON_UNESCAPED_UNICODE);
        return $json;
    }