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Asked: 2026-05-11T13:39:57+00:00

I’d like to create DetachedCriteria which would perform something similar to the following SQL

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I’d like to create DetachedCriteria which would perform something similar to the following SQL code:

select * FROM PRICELIST pl LEFT OUTER JOIN PRICELISTDURATIONSHIFT sh ON sh.PRICELISTID = pl.ID WHERE sh.CUSTOMERID = :cust   AND nvl(sh.DATEFROM, pl.DATEFROM) <= :dt ORDER BY nvl(sh.DATEFROM, pl.DATEFROM) DESC

I’m able to left-outer-join the PriceListDurationShift class/table and add the Customer constraint, but I’m not able to figure out how to add something like the nvl(sh.DATEFROM, pl.DATEFROM) <= :dt restriction.

I’d appreciate any advice for this sample and also any advice on NHibernate materials on advanced DetachedCriteria querying.

hopefully this would work:

var priceLists = priceListRepo.FindAll(DetachedCriteria.For<PriceList>('pl')     .CreateCriteria((PriceList x) => x.PriceListDurationShifts, () => shift,         JoinType.LeftOuterJoin)     .Add<PriceListDurationShift>(x => x.Customer == cust)     .Add(Expression.Or(         Expression.And(Restrictions.IsNull('shift.DateFrom'),             Restrictions.Le('pl.DateFrom', dt.DateTo)),         Expression.And(Restrictions.IsNotNull('shift.DateFrom'),             Restrictions.Le('shift.DateFrom', dt.DateTo))         ))     )     .ToList();
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1 Answer

  1. I’ve looked for something like this as well, but haven’t found a solution to it.

    In the meantime, I’ve solved this by using HQL instead of the Criteria API.

    HQL has a method coalesce which can be used for this purpose.

    from PriceList as pl left join pl.PriceListDurationShift as shift where coalesce (shift.DateFrom, pl.DateFrom) <= :dt order by coalesce (shift.DateFrom, pl.DateFrom)
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