JPQL WHERE子句中的CASE语句问题

Question

我在where子句中使用case语句时遇到了一些问题。如果有人知道如何解决，请帮助我！谢谢。

 @Query("select e from EventTeamPlayer etp "
                + "join etp.event e "
                + "left join e.leagueTournament lt "
                + "left join lt.sportCategory sc "
                + "left join e.sport s "
                + "left join etp.homeTeamPlayer htpl "
                + "left join etp.awayTeamPlayer atpl "
                + "left join lt.country c "
                + "left join e.eventStatus es "
                + "where (e.startDate >= :startDate and e.startDate <= :endDate) "
                + "and lt.id = :leagueTournamentId "
                + "and (lt.defaultName like :searchTerm or "
                     + "s.name like :searchTerm or "
                     + "htpl.name like :searchTerm or "
                     + "atpl.name like :searchTerm or "
                     + "e.id like :searchTerm) and "
                     + "(case when (:minDate is not null and :maxDate is not null) "
                     + " then (e.startDate >=:minDate and e.startDate<=:maxDate)   else true end) = true")
    Page<Event> getEventsForWebAdmin(Pageable pageable, 
                                     @Param("searchTerm") String searchTerm, 
                                     @Param("leagueTournamentId") int leagueTournamentId, 
                                     @Param("startDate") Date startDate, 
                                     @Param("endDate") Date endDate,
                                     @Param("minDate") Date minDate,
                                     @Param("maxDate") Date maxDate);

以下是日志中的错误：

Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: 在第1行，第589列附近发现意外的AST节点: and [select e from com.itengine.bettinggateway.dao.EventTeamPlayer etp join etp.event e left join e.leagueTournament lt left join lt.sportCategory sc left join e.sport s left join etp.homeTeamPlayer htpl left join etp.awayTeamPlayer atpl left join lt.country c left join e.eventStatus es where (e.startDate >= :startDate and e.startDate <= :endDate) and (lt.defaultName like :searchTerm or s.name like :searchTerm or htpl.name like :searchTerm or atpl.name like :searchTerm or e.id like :searchTerm) and (case when (:minDate is not null and :maxDate is not null) then (e.startDate >=:minDate and e.startDate<=:maxDate) else true end) = true and lt.id = :leagueTournamentId]

- sundjerBob

Answer 1

我认为你不能在JPQL中使用那种语句。

尝试用类似这样的语句替换它：

AND
(
   (:minDate is not null and :maxDate is not null
         and e.startDate >=:minDate and e.startDate<=:maxDate)
   OR
   (:minDate is null or :maxDate is  null)                   
)

- Maciej Kowalski

Answer 2

如果你查看JPQL API文档，它说：

when_clause::= WHEN conditional_expression THEN scalar_expression

因此then子句可以使用：

scalar_expression ::= arithmetic_expression | string_primary | enum_primary | datetime_primary | boolean_primary | case_expression | entity_type_expression

而你正在违反这个规则。尝试用AND-OR组合替换你的CASE语句。

- veljkost