Join In queryover in NHibernate

Question

I am using NHibernate. I want to use join on queryover, try following code but this gives error,

session.QueryOver(Of Messages)()
  .Where(Function(x) x.UserID_Messages.Username.Contains(msgfrom))
  .And(Function(x) x.Message.Contains(msg))
  .And(Function(x) x.MsgDate >= startdate)
  .List

But this error = Unrecognised method call: System.String:Boolean Contains(System.String) And if i try this query

session.QueryOver(Of Messages)
  .JoinQueryOver(Of Users)(Function(x) x.UserID_Messages)
  .WhereRestrictionOn(Function(x) x.Username).IsLike("%" & tosearch & "$")
  .List(Of Messages)()

This result empty, even record is there in database. Please guide what am I doing wrong, or what is correct way to achieve this. Thanks

Answer 1

The .Contains method, is a .NET method, which is not translated into SQL statement when using QueryOver syntax. The second approach, with QueryOver native method IsLike is what we need. To be sure, that we will end up with a SQL like this:

username LIKE '%the searched value%'

we should use the built in MatchMode

.WhereRestrictionOn(Function(x) x.Username).IsLike(tosearch, MatchMode.Anywhere)

See the MatchMode class definition