4
私はNHibernateのFluent NHibernateで既存のデータベースを設定しようとしています。この問題は、ライブラリと書籍で表現された多対多マッピングの問題です。私はこれは本当に基本的なものであるべきと思いますが、私は次の例外を取得:流暢NHibernate - HasManyToMany NHibernate.MappingException:コレクションのマッピングの繰り返し列
FluentNHibernate.Cfg.FluentConfigurationException: An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail.
---> NHibernate.MappingException: Repeated column in mapping for collection: MvcNhibernatePoc.Models.Book.Libraries column: BookId
データベースの構造を変更してのようになりますすべきではない:私が作成したこのことに基づいて
Table **Book**
BookId (int)
BookName (varchar(255))
Table **Library**
LibraryId (int)
LibraryName (varchar(255))
Table **Book_Library**
Id (int)
BookId (int)
LibraryId (int)
以下のドメインクラス:
public class Library
{
public virtual int LibraryId { get; set; }
public virtual string Name { get; set; }
public virtual IList<Book> Books { get; set; }
public Library()
{
Books = new List<Book>();
}
}
public class Book
{
public virtual int BookId { get; set; }
public virtual string Name { get; set; }
public virtual IList<Library> Libraries { get; set; }
public Book()
{
Libraries = new List<Library>();
}
}
マッピング:
public class LibraryMap : ClassMap<Library>
{
public LibraryMap()
{
Table("Library");
Id(l => l.LibraryId).Column("LibraryId");
Map(l => l.Name).Column("LibraryName");
HasManyToMany<Book>(l => l.Books)
.Table("Book_Library")
.ParentKeyColumn("LibraryId")
.ChildKeyColumn("LibraryId")
.Cascade.SaveUpdate();
}
}
public class BookMap : ClassMap<Book>
{
public BookMap()
{
Table("Book");
Id(b => b.BookId).Column("BookId");
Map(b => b.Name).Column("BookName");
HasManyToMany<Library>(b => b.Libraries)
.Table("Book_Library")
.ParentKeyColumn("BookId")
.ChildKeyColumn("BookId")
.Cascade.SaveUpdate()
.Inverse();
}
}
流暢設定:
Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008.ConnectionString(conString).ShowSql)
.Mappings(m => m.FluentMappings
.AddFromAssemblyOf<Library>())
.BuildSessionFactory();
そして最後に私の失敗testcode:
var library = new Library { LibraryId = 1, Name = "Alexandria library"};
var book = new Book { BookId = 1, Name = "Pyramids for dummies" };
library.Books.Add(book);
book.Libraries.Add(library);
using (var session = NHibernateHelper.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
session.Save(library);
session.Flush();
transaction.Commit();
Console.WriteLine("Saved library " + library.Name);
}
}
+1でなければなりません^^ – Firo