return _Session.CreateCriteria(typeof(Customer))
.Add(Subqueries.PropertyIn(”CustomerId”, customerIds))
.List();
}

Which resolves to SQL:
exec sp_executesql N’SELECT this_.CustomerId as CustomerId0_0_, this_.Version as Version0_0_, this_.Firstname as Firstname0_0_, this_.Lastname as Lastname0_0_ FROM Customer this_ WHERE this_.CustomerId in (SELECT distinct this_0_.CustomerId as y0_ FROM Customer this_0_ inner join [Order] order1_ on this_0_.CustomerId=order1_.Customer WHERE order1_.OrderDate > @p0)’,N’@p0 datetime’,@p0=’2008-04-01 00:00:00:000′

(found out after reading [url=http://colinramsay.co.uk/diary/2008/01/15/nhibernate-optimising-queries-with-projections/]this[/url])

I’m playing around with a Customes-Orders hierarchy like yours, except on a SQL CE database. My tests are similar to yours, and they pass fine when retrieving orders. But when I run a test with the debugger to get a Customer object and break, I run into a problem. When I try to manually inspect the Orders collection (as you do at 47:00 of this session), I get the following error: “Function evaluation timed out.”

I’m not sure what’s causing this error and it puzzles me, since my test that loads Orders runs fine. It’s only when I inspect and look at orders for a different customer that I get the error.

Any thoughts on what might be causing this, and what I need to do to fix it? Thanks again.

[Test]
public void CanDistinctGetCustomersWithOrdersSince()

Thanks.

Great series of screen casts. I have a quick question

I get a compile error with the following code
foreach (var c in customers)
{
//TODO: Research the build error
Assert.AreEqual(1, customers.Count(x => x == c));
}

customers.Count(x => x == c)
“The property …Count cannot be used with type arguments.

Any ideas?

Thanks

AFAIK, the tx.Commit() call will in fact flush the session (e.g. within an ITransaction scope, .Commit() is semantically equivalent to call ing .Flush() on the ISession instance so you are in fact correct — there isn’t a penalty for the .Flush(), but its not required either.

Good catch.

i’m on the 6th screen cast…. you have done refactor provider class…. and wondering do we need to flush the _session ? if you are not using?

just curious about how _session working.

thanks and great videos.

Glad you’re enjoying the content; its nice to know that my informal approach to teaching is being well-received as something other than the rest of the snoozer training videos out there on other topics

Thank you.

Oh yeah, and it’s educational. LOL.