我认为解决方案比看起来简单。您忘记了包含cb.max ()在CriteriaBuilder子查询中。以下代码执行您要查找的查询。
final CriteriaBuilder cb = entityManager.getCriteriaBuilder();
final CriteriaQuery<Person> cq = cb.createQuery(Person.class);
final Root<Person> root = cq.from(Person.class);
cq.select(root);
final Subquery<Integer> subquery = cq.subquery(Integer.class);
final Root<Person> validityIDSQ = subquery.from(Person.class);
subquery.select(cb.max(validityIDSQ.get(Person_.validityID)));
subquery.groupBy(validityIDSQ.get(Person_.personID));
cq.where(cb.in(root.get(Person_.validityID)).value(subquery));
select
person0_.id as id1_0_,
person0_.personID as personID2_0_,
person0_.validityID as validity3_0_,
person0_.value as value4_0_
from
person person0_
where
person0_.validityID in (
select
max(person1_.validityID)
from
person person1_
group by
person1_.personID)
我认为您正在使用Postgres。没有cd.max()它会产生您引用的错误，因为您使用GroupBy而不使用聚合函数。我在Postgres和MysqL上进行了测试。两者兼具魅力。
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