JPQL：CASE中的布爾表達式何時需要與TRUE/FALSE進行明確比較？

我曾試過如下：JPQL：CASE中的布爾表達式何時需要與TRUE/FALSE進行明確比較？

SELECT NEW com.kawoolutions.bbstats.view.ScheduleGameLine(
    ga.id                  AS gid 
    , ga.scheduledTipoff               AS scheduledtipoff 
    ... 
    , sch.finalScore                AS homefinalscore 
    , sca.finalScore                AS awayfinalscore 
    , CASE WHEN pah.wasWithdrawn OR paa.wasWithdrawn THEN TRUE ELSE FALSE END AS waswithdrawn 
)

最後一行是很重要的。據

JPQL/HQL and JPA/Hibernate: boolean expression in select constructor expression not working (unexpected AST node: AND, NPE, HqlSqlWalker.setAlias)?

的情況下是必要的。但是運行這個時候，Hibernate的失敗，

Exception in thread "main" java.lang.IllegalArgumentException: org.hibernate.hql.ast.QuerySyntaxException: unexpected AST node: . near line 19, column 18 
    at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54) 
    at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47) 
    at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:82) 
    at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:261) 
    at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185) 
    at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136) 
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101) 
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80) 
    at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:124) 
    at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156) 
    at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135) 
    at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1770) 
    at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:272)

這顯然不是由JPA/Hibernate的語法支持，但Java和數據庫程序員，我期望這樣的表達工作，就像如果（hasHitHard）...和/或SELECT was_withdrawn ...

爲什麼這樣做或爲什麼不支持我所期望的？

來源

2011-02-12 Kawu

我不確定AS運算符是否被select子句支持，但在這種情況下它是多餘的。至於CASE運營商可能簡單pah.wasWithdrawn或paa.wasWithdrawn將足夠好：

SELECT NEW com.kawoolutions.bbstats.view.ScheduleGameLine(
    ga.id,ga.scheduledTipoff,..., 
    sch.finalScore, sca.finalScore, 
    pah.wasWithdrawn OR paa.wasWithdrawn 
) from ...

來源

2011-02-13 20:28:18

看來你沒有完全閱讀我的帖子。當然，AS是支持的。對於你的其他評論請參閱鏈接http://stackoverflow.com/questions/4972369/jpql-hql-and-jpa-hibernate-boolean-expression-in-select-constructor-expression-n ...所以它只是關於 = TRUE/ = FALSE比較。 – Kawu 2011-02-13 20:32:42

JPQL：CASE中的布爾表達式何時需要與TRUE/FALSE進行明確比較？

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