ORACLE分页步骤

ORACLE分页方法

1.数据表结构

表名

Authoring

字段

authoringId NUMBER PRIMARY KEY，

name?VARCHAR(50) NOT NULL,

startDate Date

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2.分页：以startDate逆序分页

SELECT *
? FROM (SELECT a.*, row_number() OVER(ORDER BY a.STARTDATE DESC) rownumber
????????? FROM AUTHORING a) tmp
?WHERE tmp.rownumber between 1 and 5;

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SELECT *
? FROM (SELECT tmp.*, rownum rownumber
????????? FROM (SELECT a.* FROM AUTHORING a ORDER BY STARTDATE DESC) tmp) rslt
?WHERE rslt.rownumber between 1 and 5;

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注: ORDER BY 是对where过滤之后的结果在缓存内进行order，

???? 根据rownum的原理，order之前rownum的值已经确定，

???? 所以分页时需先order by 然后再取rownum的值

select *
? from (SELECT tmp.*, rownum rownumber
????????? FROM (SELECT a.* FROM AUTHORING a ORDER BY STARTDATE DESC) tmp
???????? where rownum <= 5) rslt
?WHERE rslt.rownumber >= 1;

SELECT tmp.*
FROM (SELECT a.* FROM AUTHORING a ORDER BY STARTDATE DESC, Authoringid) tmp
WHERE rownum <= 6;

(第6条记录的authoringId=1076328)

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SELECT tmp.*
FROM (
???? SELECT a.STARTDATE, a.Authoringid, a.name
???? FROM AUTHORING a
???? WHERE a.startdate < (SELECT a.startdate FROM AUTHORING a WHERE a.AUTHORINGID = 1076328)
???? UNION
???? SELECT a.STARTDATE, a.Authoringid, a.name?
???? FROM AUTHORING a W
???? HERE a.startdate = (SELECT a.startdate FROM AUTHORING a WHERE a.AUTHORINGID = 1076328) and a.authoringid >= 1076328
???? ORDER BY STARTDATE DESC, Authoringid
) tmp
WHERE rownum <= 6;

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此方法不能准备定位于某一页，只支持previous和next，每次需要多取1条数据用于判断是否存在下一页。

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