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我需要查詢才能從一組記錄中查找包含最近日期的記錄。我已經嘗試了一堆東西,與最近的是這樣的:在日期字段上使用max的JPQL查詢
select msg, msg.createdDate from ImportedMessage msg where msg.siteId = ?1 and msg.createdDate = max(msg.createdDate) group by msg.createdDate
不幸的是,我什麼都嘗試,取得了某種錯誤。我似乎得到大多數的錯誤是:
Caused by: java.sql.SQLException: Not in aggregate function or group by clause: [email protected] in statement [select importedme0_.IMPORTED_MSG_ID as col_0_0_, importedme0_.CREATED_DATE as col_1_0_, max(importedme0_.CREATED_DATE) as col_2_0_, importedme0_.IMPORTED_MSG_ID as IMPORTED1_1_, importedme0_.CREATED_BY as CREATED2_1_, importedme0_.CREATED_DATE as CREATED3_1_, importedme0_.UPDATED_BY as UPDATED4_1_, importedme0_.UPDATED_DATE as UPDATED5_1_, importedme0_.IMPORT_TYPE as IMPORT6_1_, importedme0_.MESSAGE as MESSAGE1_, importedme0_.PROCESSED_FLAG as PROCESSED8_1_, importedme0_.SITE_ID as SITE9_1_ from IMPORTED_MSG importedme0_ where importedme0_.SITE_ID=? and importedme0_.CREATED_DATE=max(importedme0_.CREATED_DATE) group by importedme0_.CREATED_DATE] at org.hsqldb.jdbc.Util.throwError(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.(Unknown Source) at org.hsqldb.jdbc.jdbcConnection.prepareStatement(Unknown Source) at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534) at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452) at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1616) at org.hibernate.loader.Loader.doQuery(Loader.java:717) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270) at org.hibernate.loader.Loader.doList(Loader.java:2449) ... 52 more
我相信,這是告訴我的是,我沒有合適的東西在我的SELECT子句允許組的工作。但是,我嘗試了各種組合,並且所有事情都會導致出現此錯誤。
有人可以給我一個線索我在做什麼錯在這裏?
setMaxResults(1)如何在J中實際工作PA?它指示數據庫只返回一行,還是根據查詢獲取數據庫中的所有行,然後只返回一行? – Wudong 2014-02-12 15:21:57
setMaxResults(1)的工作方式取決於JPA實現和jdbc驅動程序的功能。在MS-SQL上的OpenJPA中,這轉換爲底層SQL查詢中的SELECT TOP 1。 – Armand 2014-12-10 01:33:09