Hibernate的`setFirstResult`不起作用

Question

I have a class that returns all the entities in a query, limited by a max and a min:

@SuppressWarnings("unchecked")
public static <E> List<E> getAll(Class<E> klass, Integer startAt) {
    startAt = (startAt == null) ? 0 : startAt;
    int endAt = startAt + Constant.API_MAX_RESULTS;
    return (List<E>) HibernateUtil.getCurrentSession()
        .createCriteria(klass)
        .setFirstResult(startAt)
        .setMaxResults(endAt)
        .list();
}

Where Constant.API_MAX_RESULTS is 100 . So for example, if I want 100-199 genes, I will call:

getAll(Gene.class, 100);

If I print startAt and endAt , I correctly see 100 and 200 , but what I actually get returned is 0-199 inclusive genes.

When I configure Hibernate to show the SQL, I see this:

select this_.id as id8_0_, ... from gene this_ limit ?, ?

Should values be set on limit ? Why isn't the lower bound working?

Answer 1

Hibernate's show_sql shows the SQL with parameter placeholders, so it does not show the actual values. (It is logged at TRACE level though).

You problem is that you did not understand what setMaxResults() does, it sets the max. number of items fetched.

Answer 2

.setMaxResults是要返回的最大记录数，因此我相信您希望setMaxResults为100。