NHibernate.Linq LIKE

Question

How can I produce this query using NHibernate.Linq?

WHERE this_.Name LIKE @p0; @p0 = \'test\'  // Notice NO % wild card

Note, this is not Linq

Answer 1

With NH 4 (and probably a bit earlier), a built-in Like string extension is available within NHibernate.Linq namespace: Like(this string matchExpression, string sqlLikePattern). (It is defined on NHibernate.Linq.SqlMethods extension class.)

using NHibernate.Linq;
...
session.Query<Theater>()
    .Where(t => t.Name.Like("test"));

Answer 2

I believe this is what you are looking for:

var theaters = from theater in Session.Linq<Theater>() 
               where theater.Name.Contains("test") 
               select theater;

According to my tests it generates an SQL 'LIKE' statement: "... WHERE theater.Name LIKE %test%"

which is exactly the output of the criteria snippet you have provided.

Answer 3

I had the same problem in my project and found a solution :

session.Linq<Theater>()
    .Where(x => x.Name.StartsWith("test") && x.Name.EndsWith("test");

This translates in SQL to

SELECT ... WHERE Name LIKE '%test' AND Name LIKE 'test%'

Answer 4

Whilst this has been marked as resolved, which was correct at the time, may I also note that NHibernate has some extensions now so you can do the following:

Session.QueryOver<MyEntity>()
    .Where(x => x.Property.IsLike("something", MatchMode.Anywhere))
    .List();

This will do a LIKE '%something%' for you.