学习必须先入门，站在山顶，学习第一手资料去俯瞰全貌，拒绝二手或者n手资料，浪费时间而且还不一定对。
jenkins roadmap:
ant top
selinum top
jmeter top
select 0 as rown,* from basebook where book_id = 566
union
SELECT (SELECT COUNT(*) FROM basebook AS t2 WHERE t2.book_id < t1.book_id)+1 AS rown, *
FROM basebook t1
where book_id != 566
order by rown asc
