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当“in”表达式之一具有 1000 个或更多项目时，我有以下 Hibernate NamedQuery 会遇到问题。当我在 (:devices) 的 ma.deviceId 中有 1000 个或更多项目时，我得到java.sql.SQLException: ORA-01795: maximum number of expressions in a list is 1000

我需要处理的唯一“in”表达式是“and ma.deviceId in (:devices)”。有人对如何重写这个 NamedQuery 有任何想法吗？我正在使用 JPA 和休眠。 

@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 " )
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2 回答 2

2

有2种方式。
1）将您的列表存储在中间表中并执行
... IN (SELECT ... FROM intermediaryTable)
2）将您的列表分成子列表，每个子列表最多 1000 个元素并将您的查询写为
(... IN (subList1) OR ... IN (subList2) ...)

于 2012-08-21T17:37:07.210 回答
1

对于我们的应用程序，我们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
于 2012-08-21T17:45:48.633 回答