您可以使用CriteriaBuilder＃function（）执行要添加days到中的数据库函数retentionDate。我已经使用DATEADD（）制作了一个示例，因为我的测试项目使用H2数据库运行。
ParameterExpression<String> dayUnit = builder.parameter(String.class, "dayUnit");
Expression<DateTime> newDate = builder.function("DATEADD", DateTime.class, dayUnit, days, retentionDate);
完整的示例：
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<B> cq = builder.createQuery(B.class);
Root<B> fromB = cq.from(B.class);
Expression<DateTime> lastmodifiedDate = fromB.get(B_.lastmodifiedDate);
Expression<DateTime> retentionDate = fromB.get(B_.a).get("retentionDate");
Expression<Integer> days = fromB.get(B_.a).get("days");
ParameterExpression<String> dayUnit = builder.parameter(String.class, "dayUnit");
Expression<DateTime> newDate = builder.function("DATEADD", DateTime.class, dayUnit, days, retentionDate);
cq.where(builder.greaterThanOrEqualTo(newDate, lastmodifiedDate));
TypedQuery<B> tq = entityManager.createQuery(cq.select(fromB));
tq.setParameter("dayUnit", "DAY");
List<B> results = tq.getResultList();
select
b0_.id as id1_1_,
b0_.a_id as a_id3_1_,
b0_.lastmodified_date as lastmodi2_1_
from b b0_
cross join a a1_
where b0_.a_id=a1_.id
and DATEADD(?, a1_.days, a1_.retention_date)>=b0_.lastmodified_date
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