Question

For a column of type varchar I could write such search query:

public IList<Order> GetByName(string orderName)
{
 using (ISession session = NHibernateHelper.OpenSession())
 {
  return session.CreateCriteria<Order>().
   Add(Restrictions.Like("Name", string.Format("%{0}%", orderName))).
   List<Order>();
 }
}

How do I implement the similar search query for a column that has a DateTime type?

public IList<Order> GetByDateTime(string str)
{
    using (ISession session = NHibernateHelper.OpenSession())
    {
        return session.CreateCriteria<Order>()
            .Add(Restrictions.Like(Projections.Cast(NHibernateUtil.String, Projections.Property("Created")),
                                    '%' + str + '%'))
            .List<Order>();
    }
}

That is, if the method is passed the date and part-time (eg “25.03.2010 19”), then displays all orders are carried out in this period of time:

25.03.2010 19:22:00

25.03.2010 19:44:00

25.03.2010 19:59:00

Answer 1

Just check if the date is within your desired range:

DateTime beginDate = new DateTime(2010, 3, 25, 19, 0, 0);
DateTime endDate = new DateTime(2010, 3, 25, 20, 0, 0);
return session.CreateCriteria<Order>()
   .Add(Expression.Between("OrderDate", beginDate, endDate))
   .List<Order>();