HQL錯誤和可空領域

Question

爲什麼這個查詢不起作用

FROM WorkflowConfiguration 
WHERE ((saReplacement IS NOT NULL) AND (:currentTime >= saReplacement.start) AND (saReplacement.end >= :currentTime)) OR 
       ((hrmsAdminReplacement IS NOT NULL) AND (:currentTime >= hrmsAdminReplacement.start) AND (hrmsAdminReplacement.end >= :currentTime)) OR 
       ((hrManagerReplacement IS NOT NULL) AND (:currentTime >= hrManagerReplacement.start) AND (hrManagerReplacement.end >= :currentTime)) OR 
       ((payrollAdminReplacement IS NOT NULL) AND (:currentTime >= payrollAdminReplacement.start) AND (payrollAdminReplacement.end >= :currentTime)) 

但是這一次確實

FROM WorkflowConfiguration 
WHERE (saReplacement IN (from WorkflowReplacement as replacement WHERE (:currentTime >= replacement.start) AND (replacement.end >= :currentTime))) OR 
       (hrmsAdminReplacement IN (from WorkflowReplacement as replacement WHERE (:currentTime >= replacement.start) AND (replacement.end >= :currentTime))) OR 
       (hrManagerReplacement IN (from WorkflowReplacement as replacement WHERE (:currentTime >= replacement.start) AND (replacement.end >= :currentTime))) OR 
       (payrollAdminReplacement IN (from WorkflowReplacement as replacement WHERE (:currentTime >= replacement.start) AND (replacement.end >= :currentTime))) 

之所以它這麼久是saReplacement，hrmsAdminReplacement，hrManagerReplacement和payrollAdminReplacement都可以null，所以我放入一個檢查來確保它們不是null，因此該子句的其餘部分不會被執行。但由於某種原因，當我運行第一個查詢時，我沒有得到任何結果，但是如果我運行第二個查詢（效率低得多），我會得到所有預期結果。這是Hibernate的HQL中的錯誤還是我失去了主意？

Answer 1

你有沒有嘗試過這樣的事情：

FROM WorkflowConfiguration wfc 
LEFT JOIN FETCH wft.saReplacement a 
LEFT JOIN FETCH wft.hrmsAdminReplacement b 
LEFT JOIN FETCH wft.hrManagerReplacement c 
LEFT JOIN FETCH wft.payrollAdminReplacement d 
WHERE 
((:currentTime >= a.start) AND (a.end >= :currentTime)) or 
((:currentTime >= b.start) AND (b.end >= :currentTime)) or 
((:currentTime >= c.start) AND (c.end >= :currentTime)) or 
((:currentTime >= d.start) AND (d.end >= :currentTime))