linq-to-nhibernate

问题 I'm using NHibernate 3.2 and have the following model: class User { public virtual int Id { get; set; } public virtual string Username { get; set; } public virtual IList<Log> Logs { get; set; } } class Log { public virtual int Id { get; set; } public virtual User User { get; set; } public virtual DateTime Date { get; set; } } Now, I want to query User with the date of ther latest Log-entry. class UserDto { public int UserId { get; set; } public string Username { get; set; } public DateTime?

问题 i m trying to use linq to nhibernate 3 and i have made following linq query var a = (from c in Session.Query<ChoiceValue>() join Specific in ( (from choicevaluelocale in Session.Query<ChoiceValueLocale>() where choicevaluelocale.UICulture == "en-GB" select new { choicevaluelocale.ChoiceValue.ChoiceGroup.ChoiceGroupName, choicevaluelocale.ChoiceValue.ChoiceValueId, choicevaluelocale.DisplayName, choicevaluelocale.Description })) on new { c.ChoiceGroup.ChoiceGroupName, c.ChoiceValueId } equals

问题 I'm using Fluent NHibernate in one of my projects (and ASP.NET MVC application), with LINQ to query to data (using the LINQ to NHibernate libraries). The objet names are changed to protect the innocent. Let's say I have the following classes Foo, Bar, Baz, and their appropriate tables in the database (MySQL). Foo has a many-to-many relationship with both Bar (table "FooBar") and Baz (table "FooBaz"), defined in the Fluent mappings. As such, the class interface is defined as follows: public

问题 If I had an Object A that contained a many-to-one reference to Object B, where Object B contained a one-to-many collection of Object C... consider the following query: IQueryable<A> query = getIQueryableSomehow(); List<B> resultList = query.Where(A => A.whatever == something).Select(A => A.B).Fetch(B => B.C).ToList(); I want to do something similar to this, but I keep getting a null reference exception with this code. Is there a sneaky trick to achieve this kind of query AND fetch a bunch of

问题 I added some calculated read-only properties to my class and it's now throwing a QueryException: could not resolve property. Here is my class (fake calculations right now): public class IncompleteApplication : DealerBase { public virtual string Content { get; set; } public virtual string LegalBusinessName { get { return "Leg"; } } public virtual string DbaName { get { return "Dba"; } } } Mapping: public class IncompleteApplicationMap : DealerBaseMap<IncompleteApplication> { public

问题 I'm trying to do the following with NHibernate 3.0's LINQ interface. I want to query for an object (using some Where clause), and load some children and grandchildren. Currently I'm doing it like so: var results = session.Query<Thing>() .Where(...) .Fetch(x => x.SubThingA) .ThenFetch(st => st.SubSubThingA) .Fetch(x => x.SubThingB) .ThenFetch(st => st.SubSubThingB) // etc... However, this results in a Cartesian product between all grandchildren (every result row contains many, many columns).

问题 I have a statement like so: var vals = from StandAloneUserPayment saup in _Session.Query<StandAloneUserPayment>() .Fetch(x => x.RecurringPayments) where saup.User.UserId == userId && searchString.Contains(saup.FriendlyName, StringComparer.InvariantCultureIgnoreCase) select saup; This seems to be exactly what I'm supposed to do, but I get the whole line with the Contains method underlined with the following message: string does not contain a definition for Contains and the best extension

问题 Is it possible to get Nhibernate linq to generate a query with an "In" clause? e.g. - Where AnID in (x,y,z) ? 回答1: I don't know the state of nHibernate with respect to generating all the potential LINQ queries, but you should be able to use .Contains() to generate an IN. var list = new int[] { x, y, x }; var q = db.Entities.Where( e => list.Contains( e.AnID ) ); 回答2: Agreed, this does work. I found the generated SQL for 'not in' to be strange though (as of 3.3.0 GA) ... from mytable t0_ where

问题 A Theft has an action property This is the query i'm trying to get NHibernate.Linq to produce: SELECT * FROM `thefts` LEFT JOIN memberThefts ON thefts.id = memberThefts.theftId AND memberThefts.memberId = 1 I want to get a list of all the thefts where action.memberId == some number or just null if it doesn't find a row, simple as a query yet it's been giving me a nightmare all day! thefts = session.Query<Theft>() .Fetch(x => x.action) .Where(x => x.action.memberId == member.id) .ToList();

问题 I'm trying to compare just the date of a column but because the query below is also comparing the time I get no result set back. How could I write this same LINQ query if I'm only interested in the actual date value matching? The column "ImportDate" has a value that looks similar to this 2009-08-30 12:26:00 from t in UnitsOfWork _ where t.ImportDate = "08/30/2009" _ select t 回答1: You can compare it as a string or you can use just the Date property on ImportDate where t.ImportDate.ToString(