sql_getbook=("select filename, path, registerdate, format, title, cat_type, cover, cover_type from "+TBL_BOOKS+" where book_id="+str(book_id))
sql_getbook=("select filename, path, registerdate, format, title, cat_type, cover, cover_type, filesize from "+TBL_BOOKS+" where book_id="+str(book_id))