不允許我有形式JPA/JPQL:AS標識在SELECT子句
SELECT NEW com.domain.project.view.StandingsStatLine(
ro.id AS rid
, cl.name AS team
, te.ordinalNbr + 1 AS nr
, pa.wasWithdrawn AS wd
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END) AS g
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore > sca.finalScore THEN 1 ELSE 0 END) AS w
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore < sca.finalScore THEN 1 ELSE 0 END) AS l
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 20 AND sca.finalScore = 0 THEN 1 ELSE 0 END) AS wbr
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 0 AND sca.finalScore = 20 THEN 1 ELSE 0 END) AS lbr
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 0 AND sca.finalScore = 0 THEN 1 ELSE 0 END) AS blbr
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore > sca.finalScore THEN 1 ELSE 0 END)
+ SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END)
- SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 0 AND sca.finalScore = 20 THEN 1 ELSE 0 END) AS rp
, CASE WHEN ( SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore > sca.finalScore THEN 1 ELSE 0 END)
+ SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END)
- SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 0 AND sca.finalScore = 20 THEN 1 ELSE 0 END)
- SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END))
/SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1.0 ELSE 0.0 END) >= 0.0
THEN (( SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore > sca.finalScore THEN 1 ELSE 0 END)
+ SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END)
- SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore = 0 AND sca.finalScore = 20 THEN 1 ELSE 0 END)
- SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END))
/SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1.0 ELSE 0.0 END))
ELSE 0.0 END AS nrp
, CASE WHEN SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END) > 0
THEN (SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore > sca.finalScore THEN 1.0 ELSE 0.0 END)
/SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN 1 ELSE 0 END))
ELSE NULL END AS wperc
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore IS NOT NULL THEN scf.finalScore ELSE 0 END) AS ptsf
, SUM(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND sca.finalScore IS NOT NULL THEN sca.finalScore ELSE 0 END) AS ptsa
, MAX(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore NOT IN (0, 20) THEN scf.finalScore ELSE NULL END) AS hi
, MAX(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore NOT IN (0, 20) THEN scf.game.id ELSE NULL END) AS higid
, MIN(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore NOT IN (0, 20) THEN scf.finalScore ELSE NULL END) AS lo
, MIN(CASE WHEN paf.wasWithdrawn = FALSE AND paa.wasWithdrawn = FALSE AND scf.finalScore NOT IN (0, 20) THEN scf.game.id ELSE NULL END) AS logid
)
FROM Club cl
JOIN cl.teams te
JOIN te.rosters ro
JOIN ro.season se
JOIN ro.participations pa
JOIN pa.group gr
JOIN gr.round rd
JOIN rd.subCompetition sc
JOIN sc.competition cn
JOIN gr.games ga
JOIN ga.scores scf
JOIN ga.scores sca
JOIN scf.roster rof
JOIN sca.roster roa
JOIN rof.participations paf
JOIN roa.participations paa
WHERE ...
GROUP BY ...
ORDER BY pa.wasWithdrawn, nrp DESC, w DESC, lbr, g DESC, cl.shorthand
的相當複雜的JPQL查詢與Hibernate 4.x的運行此工程沒有問題,但是Eclipse的大理顯示了一個漂亮的JPQL錯誤構造函數表達式的每一行。刪除... AS <identifier>
可以消除這些錯誤。
我在這裏查看了JPQL BNF http://en.wikibooks.org/wiki/Java_Persistence/JPQL_BNF,但我在SELECT子句層次結構中找不到AS
。
Q記者:
這是Hibernate的相關語法?
爲什麼JPQL不支持這個?
有時表達式可能變得非常複雜,我想通過AS
子句記錄表達式的實際含義,特別是考慮到JPQL沒有評論功能。這是JPQL恕我直言的一個真正的缺陷。
此外,Hibernate允許我在ORDER BY
子句中引用這些AS
es,這允許我重複使用上面的複雜語句。
也許我的表情可能會縮短,但其他情況/項目的複雜度仍然很高。
謝謝
有點偏離主題,但如果您的目標是讓查詢更具可讀性,那麼您爲什麼使用像'te','se','nrp','w'這些令人難以置信的神祕縮寫?作爲您的查詢的隨便讀者,我有根本不知道'g ORDER應該訂購什麼。 – 2012-08-04 12:06:31
是的,我同意你的看法,所選的縮寫非常笨拙。這些都是針對籃球的:g =遊戲,w =勝,l =損失等。對籃球運動員來說,大多數都是可以理解的,但nrp =規範化的排名點超出了範圍。我會將其作爲端口的一部分進行更改,因爲我必須自己查找nrp:o)看起來'AS ...'不是JPA。我只是想知道如何在'ORDER BY'子句中使用這些表達式...: -/ – Kawu 2012-08-04 16:30:26