WHERE CLAUSE问题中的JPQL CASE语句

Question

我在where条款中的case语句有一些问题。如果有人知道如何解决这个问题，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);

这里是日志中的错误：

引起：org.hibernate.hql.internal.ast.QuerySyntaxException：意外的AST节点：并且在第1行附近，第589行[从com.itengine.bettinggateway.dao.EventTeamPlayer中选择e并加入etp.event e left join e.leagueTournament左边连接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）和（lt.defaultName like：searchTerm或s.name like：searchTerm或htpl.name like：searchTerm或atpl.name like：searchTerm或e.id like：searchTerm）and（case when（：minDate is） not null和：maxDate不为null）然后（e.startDate> =：minDate和e.startDate <=：maxDate）else true end）= true和lt.id =：leagueTournamentId]

Answer 1

我不认为你可以在JPQL中使用那种语句。

尝试用这样的东西替换它：

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)                   
)

Answer 2

如果你看看JPQL API docs，它会说：

when_clause::= WHEN conditional_expression THEN scalar_expression

所以then条款可以使用：

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

你在你的子句中违反了这一点。尝试用AND-OR组合替换CASE。