Since it's not supported by HQL, it can't be supported by the Linq provider.
Fetching all Pages and Categories if you only need 5 is of course a bit redundant. /G 2013/10/10 nfplee <[email protected]> > Hi, I have to search other multiple tables and union the results together. > For example say I have the following: > > var search = "Temp"; > var query1 = session.Query<Page>().Where(p => > p.Name.Contains(search)).Select(p => p.Name); > var query2 = session.Query<Category>().Where(c => > c.Name.Contains(search)).Select(c => c.Name); > var results = query1.Union(query2).Take(5); > > One solution is to execute each query individually and then do the > union/concat in memory but this isn't efficient when a single query returns > back thousands of results. > > I've done a search online and realized the Union operator is not supported > (https://nhibernate.jira.com/browse/NH-2710). I've done some extensions > to the linq provider but nothing as complicated as this but I thought I > would download the NHibernate source code and take a look. From my findings > I see the linq provider uses the Remotion.Linq project. I'm not familiar > with the project but I found the following blog post ( > https://www.re-motion.org/blogs/mix/2012/10/12/re-linq-subquery-boundaries-after-groupby-union-and-similar-operators/) > which would indicate that the Union operator is supported. > > I was wondering how hard it would be to enable it for NHibernate? If it's > difficult then I guess I'll just scrap the idea and wait until one of you > clever people implements it. > > Thanks > > Lee > > -- > > --- > You received this message because you are subscribed to the Google Groups > "nhibernate-development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- --- You received this message because you are subscribed to the Google Groups "nhibernate-development" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
