CODEWITHSUNDEEP
nhibernatequeryoverdialect
Ruben Monteiro
Ruben Monteiro

Reputation: 315

Can I use SQL functions in NHibernate QueryOver?

I have been searching the internet and can't find an example on how to use the queryover of nhibernate 3.0 For example I would like to use the string functions on the where clause of the queryover ex:

var item = Query.Where(x => x.Name.ToLower() == name.ToLower()).FirstOrDefault();

But this doesn't work, because nhibernate can't understand the ToLower, so how can extend the dialect in a way that this becomes possible?

Upvotes: 11

Views: 5148

Answers (2)

dotjoe
dotjoe

Reputation: 26940

session.QueryOver<Foo>()
    .Where(Restrictions.Eq(
        Projections.SqlFunction("lower", NHibernateUtil.String, 
            Projections.Property<Foo>(x => x.Name)),
        name.ToLower()))

should get you SQL like where lower(Name) = @p0

Upvotes: 10

Todd
Todd

Reputation: 1481

I believe it works at least in the build I am using (version 3.0.0.4000)... below is my example...

var reasons = _session.Query<Reason>();
var myReason = (from r in reasons 
                where r.IsCritical 
                   && r.ReasonCode.ToUpper() == reasonCode.ToUpper() 
               select r).FirstOrDefault();

Give it a shot and let me know if it works for you...

Upvotes: 0

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