You can turn lazy-loading on/off for each relationship by using
References(x => x.Author).LazyLoad() or References(x =>
x.Author).Not.LazyLoad(). Same method is available for HasMany/ManyToMany.
As far as I know, NHibernate has lazy-loading enabled by default.
вторник, 17 сентября 2013 г., 7:17:30 UTC+4 пользователь Igor Boros написал:
>
> Let's say that I have entity and mapping classes below, and to keep things
> simple they are showing only one References/Has Many property, but imagine
> they have large number of one-to-many, many-to-many relationships.
>
> In example classes, does it mean that an implementation of a repository's
> method that retrieve an Author object, for this purpose, let's call it
> GetAuthorById(int
> id) has to always retrieve all of author's books or can I dictate what I
> retrieve from database. For example, sometimes I would like to omit
> grabbing the list of Books if they are irrelevant. If I can do this, what
> way would you suggest to go about it? Perhaps, turn off lazy loading and
> create completely separate methods; or pass something like enum
> AuthorDetails param and based on it dictate .Query<Author>() within
> GetAuthorById(int
> id), or something completely else?
>
> Author.cs
>
> public class Author{
> public virtual int Id { get; set; }
> public virtual string Name { get; set; }
> public virtual IEnumerable<Book> Books { get; set; }}
>
> Book.cs
>
> public class Book{
> public virtual int Id { get; set; }
> public virtual string Name { get; set; }
> public virtual Author Author { get; set; }}
>
> AuthorMap.cs
>
> public class AuthorMap : ClassMap<Author>{
> public ClientMap()
> {
> Id(x => x.Id).Column("PKId");
> Map(x => x.Name);
> HasMany(x => x.Books).KeyColumn("AuthorId");
> Table("Authors");
> }}
>
> BookMap.cs
>
> public class BookMap : ClassMap<Book>{
> public BookMap()
> {
> Id(x => x.Id).Column("PKId");
> Map(x => x.Name);
> References(x => x.Author).Column("AuthorId");
> Table("Books");
> }}
>
>
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