Question

我有下面的Hibernate NamedQuery，当其中一个“in”表达式有1000个或更多项时会遇到问题。当我在（：devices）中的ma.deviceId中有1000个或更多项时，我得到 java.sql.SQLException：ORA-01795：列表中的最大表达式数为1000

我需要处理的唯一“in”表达式是“和（：devices）中的ma.deviceId”。任何人有任何关于如何重写这个NamedQuery的想法？我正在使用JPA和Hibernate。

@NamedQuery(name = "Messages.findMessages", query = " SELECT ma from Messages ma JOIN FETCH ma.messagePayLoadXml mx LEFT OUTER JOIN FETCH ma.messageProperties  mp " +
                  " WHERE ma.customerId = :customerId and ma.time >= :startTime and ma.time <= :endTime " +
                  " and ma.deviceId in (:devices) and  mx.messageType = 'XML' and mx.alerts in " +
                  " ( select mtfm.messageType from MessageTypeFeatureMap mtfm where mtfm.feature in (:featureType) ) " +
                  " and ma.messageKey = mx.messageKey and ( mp.deleted = 0 or mp.deleted is null ) " +
                  " order by ma.time desc " )

Answer 1

有两种方式。
1）将您的列表存储在中间表中并执行 ... IN (SELECT ... FROM intermediaryTable)
2）将您的列表分成多达1000个元素的子列表，并将您的查询写为
(... IN (subList1) OR ... IN (subList2) ...)

Answer 2

对于我们的应用程序，我们已针对这种情况做了一个简单的修复...

 If number of values are greater than 999
      QUERY = SELECT + FROM + WHERE + COND1 +
              ( FIELD IN ( 999 values ) OR FIELD IN ( 999 values )...)  + ORDER
 Else
      QUERY = SELECT + FROM + WHERE + COND1 + IN (...) + ORDER

JPA和Hibernate NamedQuery错误：列表中的最大表达式数为1000

2 个答案: