c# - nhibernate criteria set the alias of a subclass parent? -


i have abstract base class contains property called "datecreated"; has number of child classes, of link each other.

when try query against 1 of child classes, ambiguous column error datecreated, contained in more 1 table.

here snippet of criteria:

.setprojection(projections.projectionlist() .add(projections.groupproperty(item.linkfield + ".id"), "measure") .add(projections.count("id"), "statcount") .add(projections.groupproperty("lnk." + item.linktextfield), "measuretext") .add(projections.sqlgroupprojection("month(datecreated) [period]", "month(datecreated)", new[] { "period" }, new itype[] { nhibernateutil.int32 })))

is there way me specify part of criteria alias join between subclass , parent? don't think createalias work there no joining properties.

  1. if prefix {alias}. datecreated, prefix _this in generated sql , while alias of current table, not alias of parent table contains datecreated field, column not found.

  2. if prefix this_1_. datecreated alias nhibernate gives parent table in generated sql, query works, think bad idea.

here generated sql nhibernate:

select top (5) this_.incidenttype_id      y0_,                count(this_.module_id)     y1_,                lnk1_.dicttext             y2_,                month(this_1_.datecreated) [statfrequency]   tblincident this_        inner join tblmodule this_1_                on this_.module_id = this_1_.id        inner join tbldict lnk1_                on this_.incidenttype_id = lnk1_.id        left outer join tbldictcode lnk1_1_                     on lnk1_.id = lnk1_1_.dict_id        left outer join tbldictimage lnk1_2_                     on lnk1_.id = lnk1_2_.dict_id        left outer join tbldictsdscategory lnk1_3_                     on lnk1_.id = lnk1_3_.dictimage_id  this_1_.customer_id = 2        , this_1_.isarchive = 0        , this_1_.isactive = 1        , this_1_.isconfidential = 0        , this_.incidentdate between '2012/01/01' , '2013/04/01'        , this_1_.isactive = 1        , this_1_.customer_id = 2        , this_1_.orgunit_id between 3 , 1000 group  this_.incidenttype_id,           lnk1_.dicttext,           month(this_1_.datecreated)

in example, tblincident subclass of tblmodule datecreated contained within tblmodule reason above criteria worked because passed in "this_1_" whats automatically assigned nhibernate. using "{alias}" output "this_1" cause error.

i want way specify alias.


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