How do you do a union of two tables in NHibernate?

问题

I need to do a union of two tables using NHibernate and HQL. I have found very little help online, and I want to know if it is possible and if so how?

回答1:

Found my answer:

http://www.hibernate.org/117.html#A21

It doesn't currently support union or intersect.

回答2:

You could use a named sql-query and do the union in raw SQL. NHibernate will be able to populate entity instances from the sql-query and return those as the query result. See here and here.

回答3:

I don't believe HQL supports unions, but you can write your own record transformer and author the sql by hand.

来源：https://stackoverflow.com/questions/247103/how-do-you-do-a-union-of-two-tables-in-nhibernate