NHibernate query ( hql vs criteria ) - nhibernate

Question

I have an hql query string
from MyTable table
where table.StartTime + table.Duration >= : startTime
and table.MyId = : id
How can I write this without HQL in NHibernate (using criteria)?

Answer 1

This might be of interest regarding the DateTime + TimeSpan issue.
This will work in your case:
QueryOver:
int id = 1;
DateTime startTime = DateTime.Now.AddDays(5.0);
var vacations = session.QueryOver<Vacation>()
.Where(v => v.Employee.Id == id)
.And(v => v.StartDate > startTime
|| (v.StartDate == startTime.Date && v.Duration >= startTime.TimeOfDay))
.List();
ICriteria:
var vacationsCrit = session.CreateCriteria(typeof(Vacation))
.Add(Expression.Eq("Employee.Id", id))
.Add(Expression.Disjunction()
.Add(Expression.Gt("StartDate", startTime))
.Add(Expression.Conjunction()
.Add(Expression.Eq("StartDate", startTime.Date))
.Add(Expression.Ge("Duration", startTime.TimeOfDay))))
.List();
Both will output the exact same SQL. It should be mentioned that you cannot do something like this, as described in the link above:
var vacations = session.QueryOver<Vacation>()
.Where(v => v.Employee.Id == id)
.And(v => v.StartDate.Add(v.Duration) >= startTime) // <-- this will NOT work
.List();