A row in the DB is the representation of the state of one object: which one?
-- Fabio Maulo El 22/10/2010, a las 11:40, Brian Chavez <[email protected]> escribió: > Hi Alan, > > Thanks so much for the reply. I'm trying to avoid NHibernate using the > database to determine the type of object. > > A single row in Table 1 can be projected into any object in the class > hierarchy. > > For example, Row 5 is A, B, or C; depending on which type I'm > requesting. > > If I CreateCriteria(typeof(C)), then NHibernate has enough information > to know what type I'm requesting. > > I don't want NHibernate to extract type information from the database > (ie: discriminator) because class A, B, and C can all represent any > row in Table 1. > > The only difference between A, B, and C classes is the projections of > the columns in the table. > > I hope that clarifies my situation. > > Any feedback would be appreciated! > -Brian > > > On Oct 22, 7:13 am, "[email protected]" > <[email protected]> wrote: >> You can use formulas as discriminators as opposed to a column. You >> obviously have some sort of logic that determines the object type? >> >> On Oct 22, 9:02 am, Brian Chavez <[email protected]> wrote: >> >> >> >>> Hello. >> >>> Problem: >> >>> I have 1 very large table of columns. >> >>> I have a class hierarchy that represents different projections of the >>> columns of this table. >> >>> For example: >> >>> class A{ >>> AProperty{get;set;} //Mapped to ColumnA in Table 1 >> >>> } >> >>> class B : A { >>> BProperty{get;set;} //Mapped to ColumnB in Table 1 >> >>> } >> >>> class C : B { >>> CProperty{get;set;} >> >>> } >> >>> When I ask NHibernate to pull C, I expect to see C.AProperty, >>> C.BProperty, and C.CProperty. >> >>> Essentially, this class hierarchy represents different scoped >>> projected views of the *same* table. >> >>> How do I do this in hbm.xml mapping files without adding discriminator >>> values? >> >>> I've tried to use multiple <union-subclass> attributes and map to the >>> same table, but NH throws an exception: >> >>> --> NHibernate.DuplicateMappingException : Duplicate table mapping >>> Table 1 >> >>> Any ideas? >> >>> Thanks, >>> Brian > > -- > You received this message because you are subscribed to the Google Groups > "nhusers" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/nhusers?hl=en. > -- You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
