Question

When paging data, I want to not only return 10 results, but I also want to get the total number of items in all the pages.

How can I get the total count AND the results for the page in a single call?

My paged method is:

public IList GetByCategoryId(int categoryId, int firstResult, int maxResults)
{

        IList<Article> articles = Session.CreateQuery(
            "select a from Article as a join a.Categories c where c.ID = :ID")
            .SetInt32("ID", categoryId)
            .SetFirstResult(firstResult)
            .SetMaxResults(maxResults)
            .List<Article>();



        return articles;
    }

Answer 1

The truth is that you make two calls. But a count(*) call is very, very cheap in most databases and when you do it after the main call sometimes the query cache helps out.

Your counter call will often be a little different too, it doesn’t actually need to use the inner joins to make sense. There are a few other little performance tweaks too but most of the time you don’t need them.