用于验证日期的JPA查询，以及自该日期起的天数是否大于50天

import javax.persistence.EntityManager;
import javax.persistence.Query;
import java.util.Date;

public class DateValidationExample {
    public boolean isDateValid(EntityManager entityManager, Date date) {
        String jpql = "SELECT COUNT(e) FROM Entity e WHERE e.date = :date AND FUNCTION('DATEDIFF', e.date, CURRENT_DATE) > 50";
        Query query = entityManager.createQuery(jpql);
        query.setParameter("date", date);
        Long count = (Long) query.getSingleResult();
        return count > 0;
    }
}