how to concat two column with hibernate queryover using linq

Question

I want to concat Employee firstname and lastname at select clause but it gives :

Could not determine member from new <>f__AnonymousType0`1(name = Format("{0} {1}", x.FirstName, x.LastName))

var returnData = UnitOfWork.CurrentSession.QueryOver<Employee>()
                 .OrderBy(x => x.Id).Asc
                 .SelectList(u => u.Select(x => x.Id).WithAlias(() => 
                                           businessSectorItem.id)
                                   .Select(x => new { name = string.Format("{0} {1}",
                                                x.FirstName, x.LastName) })
                                                .WithAlias(() => businessSectorItem.text))
                                   .Where(x => (x.FirstName.IsInsensitiveLike
                                                  ("%" + searchTerm + "%") ||
                                                x.LastName.IsInsensitiveLike
                                                  ("%" + searchTerm + "%")) &&
                                                  ( x.Account == null || x.Account.Id ==
                                                                           accountId))
                                  .TransformUsing(Transformers
                                                  .AliasToBean<SearchEmployeeItemDto>())
                                  .Take(limit)
                                  .List<SearchEmployeeItemDto>();

string.Format has a lot of different options that is too complex for most SQL engines to accomplish, try using x.FirstName + " " + x.LastName — Matthew
– Matthew, Commented Aug 30, 2014 at 14:11
i just tried your suggestion but it still gives the same error — semirturgay
– semirturgay, Commented Aug 30, 2014 at 14:14
It is also possible that query engine cannot understand anonymous type of new { name = string.Format("{0} {1}", x.FirstName, x.LastName) }. I am not familiar with fluent-nhibernate, but maybe you can use string directly string.Format("{0} {1}", x.FirstName, x.LastName)? How will it interoperate with following WithAlias I don't know, but, nonetheless, it is a fair guess to check. — Eugene Podskal
– Eugene Podskal, Commented Aug 30, 2014 at 14:16
@EugenePodskal what do you mean by using string directly. If you mean that Select(x => x.FirstName+" "+x.LastName) it is also not working — semirturgay
– semirturgay, Commented Aug 30, 2014 at 14:20
Well, that was a fair, but wrong guess. Have you tried just to select x.FirstName or just x.LastName? Will it work? — Eugene Podskal
– Eugene Podskal, Commented Aug 30, 2014 at 14:22

Radim Köhler · Accepted Answer · 2014-08-30 14:23:32Z

8

The QueryOver syntax would look like this:

// instead of this
.Select(x => new { name = string.Format("{0} {1}",
     x.FirstName, x.LastName) })
     .WithAlias(() => businessSectorItem.text))                                   

// we should use this
.Select(
    Projections.SqlFunction("concat", 
        NHibernateUtil.String,
        Projections.Property<Employee>(e => e.FirstName),
        Projections.Constant(" "),
        Projections.Property<Employee>(e => e.LastName)
    )).WithAlias(() => businessSectorItem.text)

We profit here from a sql function concat. We pass a Projections.SqlFunction into Select() statement and build part using some default/basic Projections

answered Aug 30, 2014 at 14:23

Radim Köhler

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2 Comments

Radim Köhler Over a year ago

NHibernate is great! Enjoy it ;)

semirturgay Over a year ago

Entity forever.:) boss made me use NHibernate :/

flo scheiwiller · Accepted Answer · 2017-08-22 06:47:58Z

7

Or now even simpler:

using NHibernate.Criterion;

SelectList(l => l
  .Select(x => Projections.Concat(m.FirstName, ", ", m.LastName))
  .WithAlias(() => businessSectorItem.text))
)

answered Aug 22, 2017 at 6:47

flo scheiwiller

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