Alias of joined table in SQLProjection

Question

I have this query:

criteria = session.CreateCriteria(typeof (Building))
    .CreateAlias("Estate", "estate")
    .SetProjection(Projections.ProjectionList()
                       .Add(Property.ForName("Name"), "BuildingName")
                       .Add(Property.ForName("estate.Name"), "EstateName")
                       .Add(Projections.SqlProjection(
                                "(estate1_.BBRMunicipalityNumber + '-' + estate1_.BBREstateNumber + '-' + {alias}.BBRBuildingNumber)" + " as BBRNumber",
                                new[] { "BBRNumber" },
                                new[] { NHibernateUtil.String }),
                            "BBRNumber"))

Is there a way that I can get the SQL alias for "estate" like writing {estate} in the SQL string? {estate} does not work. Now I ended up hardcoding the alias in the SQL string, but that doesn't seem very solid.

If I understand the docs correctly this should be possible. I'm using NH2.0.1.

/Asger

Answer 1

Not a direct answer to your question, but: Why don't you query the three values separately and do the concatenation in your code instead of using the database for that?

To answer your question: In Hibernate v3 (java, sorry) there is a getColumnAlias method on the Projection interface. I'm not able to find its counterpart in NHibernate.

Cheers

Answer 2

You can use {alias} - it will reference the alias of the current projection.