How do I cast JPA criteria Expression<Long> to long java type-CodePudding

The

Integer a = 1; Long b = 2L; String c = "3"; Expression<Integer> integerParameter = criteriaBuilder.literal(a); Expression<Long> longParameter = criteriaBuilder.literal(b); Expression<String> stringParameter = criteriaBuilder.literal(c);

And i found that method minusDays(long) return a LocalDateTime, so i think we should take that like :

LocalDateTime ldt = LocalDateTime.now().minusDays( (long) root.get("person").get("birthDay").as(Long.class)); Expression<LocalDateTime> longParameter = criteriaBuilder.literal(ldt);

As for how to convert LocalDateTime into the data you need, I am currently unclear, because it is not clear what your specific needs are.

CodePudding user response：

Point is here. Look at the error message ,maybe it is not Long.

java.lang.NumberFormatException: For input string: "org.hibernate.query.criteria.internal.path.SingularAttributePath@2ed2d35d"

Please check value for

root.get("person").get("birthDay")