hibernate - from 子句中的 JPA/hibernate 子查询

Question

我们使用 JPA 和 hibernate 作为提供者， 我们有一个查询，其中包含与 FROM 子句中的子查询的联接，但出现以下错误:

org.hibernate.hql.ast.QuerySyntaxException: unexpected token: ( near line 1, column 75 [SELECT sd FROM com.hp.amber.datamodel.entities.analysis.SnapshotDates sd, (SELECT max(x.changeDate) maxChangeDate, x.viewId, x.state FROM com.hp.amber.datamodel.entities.analysis.SnapshotDates x WHERE x.changeDate<:date AND x.viewId in (:viewIds) AND x.state=:state GROUP BY x.viewId, x.state) sd2 WHERE sd.viewId = sd2.viewId AND sd.state = :state AND sd.changeDate = sd2.maxChangeDate]

这是查询:

SELECT sd 
FROM SnapshotDates sd, 
     (SELECT max(x.changeDate) maxChangeDate, x.viewId, x.state 
      FROM SnapshotDates x
     WHERE x.changeDate<:date AND x.viewId in (:viewIds) AND x.state=:state
GROUP BY x.viewId, x.state) sd2
WHERE sd.viewId = sd2.viewId 
      AND sd.state = :state 
      AND sd.changeDate = sd2.maxChangeDate

感谢您的帮助

Answer 1

我不认为 HQL 可以在 from 子句中执行子查询

https://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch16.html#queryhql-subqueries

注意这句话:

Note that HQL subqueries can occur only in the select or where clauses.

我想您可以将其更改为 native 查询并以这种方式执行。