public function describe($table = '')
    {
        $this->sql = $sql = "DESC $table;";
        $this->STH = $this->prepare($sql);
        $this->STH->execute();
        $colList = $this->STH->fetchAll();

        $field = [];
        $type = [];
        foreach ($colList as $key) {
            $field[] = $key['Field'];
            $type[] = $key['Type'];
        }

        return array_combine($field, $type);
    }