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  • Are NHibernate lists loaded on demand?

    - by André Pena
    This is a pretty simple question. When I do this: session.CreateCriteria(typeof(Product)).List(); The resulting list will load as I access it? Let's say, from 100 to 100 elements for example? Or will it load all once? In the case it's not "virtual" how can I make it so? What's the best pratice about it? Thanks;

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  • NHibernate : Root collection with an root object

    - by Daniel
    Hi, I want to track a list of root objects which are not contained by any element. I want the following pseudo code to work: IList<FavoriteItem> list = session.Linq<FavoriteItem>().ToList(); list.Add(item1); list.Add(item2); list.Remove(item3); list.Remove(item4); var item5 = list.First(i => i.Name = "Foo"); item5.Name = "Bar"; session.Save(list); This should automatically insert item1 and item2, delete item3 and item3 and update item5 (i.e. I don't want to call sesssion.SaveOrUpdate() for all items separately. Is it possible to define a pseudo entity that is not associated with a table? For example I want to define the class Favorites and map 2 collection properties of it and than I want to write code like this: var favs = session.Linq<Favorites>(); favs.FavoriteColors.Add(new FavoriteColor(...)); favs.FavoriteMovies.Add(new FavoriteMovie(...)); session.SaveOrUpdate(favs); FavoriteColors and FavoriteMovies are the only properties of the Favorites class and are of type IList and IList. I do only want to persist the these two collection properties but not the Favorites class. Any help is much appreciated.

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  • NHibernate FetchMode

    - by Sandra
    Hi All, I have an object Parent which has a list of Children: class Parent {Id, Name, IList children} class Child {Id, Name} I need to select all parents where there is a condition for their children but I do not want to get duplicate rows (don't want the children details to appear in select list) Here is the code: session.CreateCriteria(typeof(Parent)) .SetFetchMode("children", FetchMode.Select); .CreateCriteria("children").Add(Subqueries.PropertyIn("Id", {1,2,3,4})) .List(); The query adds all proprties of child class to select list which results in duplicate Parents. Is there any way I can select all parents without having the child details in the select list? Thanks

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  • NHibernate Criteria Find by Id

    - by user315648
    Hello, I have 2 entities: public class Authority : Entity { [NotNull, NotEmpty] public virtual string Name { get; set; } [NotNull] public virtual AuthorityType Type { get; set; } } public class AuthorityType : Entity { [NotNull, NotEmpty] public virtual string Name { get; set; } public virtual string Description { get; set; } } Now I wish to find all authorities from repository by type. I tried doing it like this: public IList<Authority> GetAuthoritiesByType(int id) { ICriteria criteria = Session.CreateCriteria(typeof (Authority)); criteria.Add(Restrictions.Eq("Type.Id", id)); IList<Authority> authorities = criteria.List<Authority>(); return authorities; } However, I'm getting an error that something is wrong with the SQL ("could not execute query". The innerexception is following: {"Invalid column name 'TypeFk'.\r\nInvalid column name 'TypeFk'."} Any advice ? Any other approach ? Best wishes, Andrew

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  • nhibernate activerecord lazy collection with custom query

    - by George Polevoy
    What i'm trying to accomplish, is having a temporal soft delete table. table Project(ID int) table ProjectActual(ProjectID int, IsActual bit, ActualAt datetime) Now is it possible to map a collection of actual projects, where project is actual when there is no record in ProjectActual.ProjectID = ID, or the last record sorted by ActualAt descending has IsActual set to 1 (true)?

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  • NHibernate and MySql Keywords

    - by jalchr
    Why Nibernate HQL can not handle the following query: from Deal D where (D.ApprovalDate + INTERVAL 1 Year) < current_timestamp() < (D.RenewalDate + INTERVAL -1 Year) knowing that INTERVAL and YEAR are keywords in MySQL, so this is kind of mixing Sql within Hql (unless Hql can handle date functions like so and I don't know) . The dialect is MySQLDialect Its perfectly valid to execute this query SELECT '2005-01-01' + INTERVAL 1 Year;

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  • NHibernate Queries with Values Produced by Business Logic

    - by Lewis
    I have an NH query which returns a Product with a BasePrice. Depending on various other factors, such as Manufacturer price markup, I use a PricingService on the C# side of things to produce a "final" price. The issue is that I now need to query against this final value - i.e., I need to run a query that selects Products within a particular "final" price range. I'm thinking that my approach to this is all wrong, but I really didn't want to put the logic of the final price calculation in a SQL function or something like that, so any suggestions would be appreciated.

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  • Nhibernate linq group by duplicate fields

    - by jaspion
    Hello, I have a simple query like: from e in endContratoRepository.GetAll() where e.Contrato.idContrato == contrato.idContrato && e.Volume.idVolume == 1 && group e by new { e.dpto.idDepartamento, e.centroCusto.idCentroCusto } into grp select new Entidade { Contagem = grp.Count(), centroCusto = grp.Key.idCentroCusto, dpto = grp.Key.idDepartamento } and the problem: The fields that are in the group by, are duplicated in the generated query. The fields centroCusto and dpto appears twice, so when I try to get the field centroCusto, I get dpto. Anyone know how to solve this? thanks a lot!

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  • NHibernate SchemaUpdate adding existing foreign keys again?

    - by afsharm
    I'm using SchemaUpdate to synchronize my hbms with existing database. Database has recently created based on hbms and is completely up-to-date. But SchemaUpdate generates all foreign key constraints again. For example suppose you have Student and Teacher. Student has association to Teacher with name ArtTeacher. ArtTeacher is a foreign key from Student to Teacher. Suppose database is up-to-date and currently holde Student, Teacher and their foreign key relation. So HBM and Database are equivalent. Know SchemaUpdate must not do anything but when I see its generated scripts, it re-produce that foreign key again. Why this happens? Is there any way to avoid it?

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  • NHibernate: References still being eagerly selected after specifying AddJoin

    - by cbp
    I have a query which is something like this: Session.CreateSQLQuery( @"SELECT f.*, b.*, z.* FROM Foo f LEFT OUTER JOIN Bar b ON b.Id = f.BarId LEFT OUTER JOIN Zar z ON z.Id = b.ZarId" ) .AddEntity("f", typeof(Foo)) .AddJoin("b", "f.BarId") .AddJoin("z", "f.ZarId") .List<Foo>(); The problem is that I am still getting hundreds of SELECT requests made to the Zar table, even though I have specified that Zar should be joined. As far as I am aware the only relationship is Foo-Bar-Zar, i.e. the reference to Zar is not occurring anywhere else. Is my understanding of AddJoin correct? What could be going wrong? List item

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  • Need some help with a NHibernate Query

    - by cwap
    Hi all Say I got 3 entities: Business, Employee and Payment. A payment has a foreign key to an Employee, while the Employee has an foreign key to a business. Now, I want to create a query which gives me all payments for a given business. I really don't have a clue about how to do this - I guess I want something like: mySession.CreateCriteria<Payment>() .Add(Criterion.Expression.Eq(/* Employee_FK => Employee.Business_FK == BusinessID */); Any help would be greatly appreciated :)

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  • Audit many-to-many relationship in NHibernate

    - by Kendrick
    I have implemented listeners to audit changes to tables in my application using IPreUpdateEventListener and IPreInsertEventListener and everything works except for my many-to-many relationships that don't have additional data in the joining table (i.e. I don't have a POCO for the joining table). Each auditable object implements an IAuditable interface, so the event listener checks to see if a POCO is of type IAuditable, and if it is it records any changes to the object. Look up tables implement an IAuditableProperty inteface, so if a property of the IAuditable POCO is pointing to a lookup table, the changes are recorded in the log for the main POCO. So, the question is, how should I determine I'm working with a many-to-many collection and record the changes in my audit table? //first two checks for LastUpdated and LastUpdatedBy ommitted for brevity else if (newState[i] is IAuditable) { //Do nothing, these will record themselves separately } else if (!(newState[i] is IAuditableProperty) && (newState[i] is IList<object> || newState[i] is ISet)) { //Do nothing, this is a collection and individual items will update themselves if they are auditable //I believe this is where my many-to-many values are being lost } else if (!isUpdateEvent || !Equals(oldState[i], newState[i]))//Record only modified fields when updating { changes.Append(preDatabaseEvent.Persister.PropertyNames[i]) .Append(": "); if (newState[i] is IAuditableProperty) { //Record changes to values in lookup tables if (isUpdateEvent) { changes.Append(((IAuditableProperty)oldState[i]).AuditPropertyValue) .Append(" => "); } changes.Append(((IAuditableProperty)newState[i]).AuditPropertyValue); } else { //Record changes for primitive values if(isUpdateEvent) { changes.Append(oldState[i]) .Append(" => "); } changes.Append(newState[i]); } changes.AppendLine(); }

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  • What is the best businessmodel when using NHibernate to access the database?

    - by Sem Dendoncker
    Hi, I'm starting to use NHiberante as a dataaccess tier. I'm used to work with the repository model as a business model. This means, my domain model (not really a tier), my asp.net application tier, my repository tier which finally uses my dataaccess tier. But with what I've learned by now (on NHibernate) I know that many logic is done within an ISession so I was wondering if NHibernate could be used within the repository tier. Or perhaps there are even better ways to use NHibernate. Does anyone know where I could find a propriate example of how to use NHibernate in an webapplication? Cheers, M.

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  • How do I use Fluent NHibernate with .NET 4.0?

    - by Tomas Lycken
    I want to learn to use Fluent NHibernate, and I'm working in VS2010 Beta2, compiling against .NET 4, but I'm experiencing some problems. Summary My main problem (at the moment) is that the namespace FluentNHibernate isn't available even though I've imported all the .dll assemblies mentioned in this guide. This is what I've done: 1. I downloaded the Fluent NHibernate source from here, extracted the .zip and opened the solution in VS. A dialog asked me if I wanted to convert the solution to a VS2010 solution, so I did. 2. I then went into each project's properties and configured all of them to compile for .NET 4, and built the entire solution. 3. I copied all the .dll files from /bin/Debug/ in the FluentNHibernate to a new folder on my local hard drive. 4. In my example project, I referenced FluentNHibernate.dll and NHibernate.dll from the new folder. This is my problem: If I right-click on FluentNHibernate in the References list and select "View in Object Browser...", it shows up correctly. Now, when I try to create a mapping class, I can't import FluentNHibernate. This code: using FluentNHibernate.Mapping; namespace FluentNHExample.Mappings { } generates an error on the using statement, saying The type or namespace 'FluentNHibernate' could not be found (are you missing a using directive or an assembly reference?). The FluentNHibernate assembly is still in the list of References of my project, but if I try to browse the assembly in Object Browser again, it can't be found. What is causing this?

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  • Is it possible to specify the name of the Index property to use for lists in a fluent nhibernate con

    - by Teevus
    When mapping a HasMany or HasManyToMany in fluent nhibernate, you can specify the column name to use for the list as a parameter to the AsList() method as follows: HasMany(c => c.Customers) .AsList(c => c.Column("PositionIndex")); I would prefer to be able to set this using a Fluent NHibernate convention (either a pre-existing one, or a custom one), especially since the default name appears to be "Index" which is a reserved word in MSSQL. I've tried using a custom convention implementing IHasManyConvention, but the instance parameter does not seem to contain the information about whether its a list, a bag, or a set, and also does not contain the column details for the index column. public void Apply(IOneToManyCollectionInstance instance) { } Any ideas?

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  • [News] NHibernate vs MS Entity Framework

    Voil? une question qui se posera de plus en plus avec la sortie prochaine de .NET V4 et Entity Framework V4, l'outil de mapping objet/relationnel de Microsoft. M?me s'il est vrai que l'opinion de Ayende peut para?tre biais?e du fait qu'il est contributeur NHibernate, son point de vue et surtout ses arguments techniques donnent du cr?dit ? ce billet. Il semble aussi que la diff?rence se jouera dans l'outillage, sur ce plan, Entity Framework a pris de l'avance avec la mod?lisation graphique des entit?s. Mais NHibernate est dans ses pas avec Visual NHibernate de l'?diteur Slyce Software.

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