c# – Fluent NHibernate – HasManyToMany NHibernate.MappingException:映射集合中的重复列
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了c# – Fluent NHibernate – HasManyToMany NHibernate.MappingException:映射集合中的重复列,小编现在分享给大家,供广大互联网技能从业者学习和参考。文章包含2573字,纯文字阅读大概需要4分钟。
内容图文
![c# – Fluent NHibernate – HasManyToMany NHibernate.MappingException:映射集合中的重复列](/upload/InfoBanner/zyjiaocheng/808/9f963e959d7143a3b1b341af94411a2c.jpg)
我是一个NHibernate新手试图用Fluent NHibernate配置现有数据库.问题在于多对多映射,在此示例中由库和书籍表示.我想这应该是非常基本的东西,但我得到以下异常:
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
不应更改数据库的结构,如下所示:
Table **Book**
BookId (int)
BookName (varchar(255))
Table **Library**
LibraryId (int)
LibraryName (varchar(255))
Table **Book_Library**
Id (int)
BookId (int)
LibraryId (int)
基于此,我创建了以下域类:
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>();
}
}
制图:
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();
}
}
流畅的配置:
Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008.ConnectionString(conString).ShowSql)
.Mappings(m => m.FluentMappings
.AddFromAssemblyOf<Library>())
.BuildSessionFactory();
最后我失败的测试代码:
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);
}
}
解决方法:
.ParentKeyColumn("BookId")
.ChildKeyColumn("BookId")
.ParentKeyColumn("LibraryId")
.ChildKeyColumn("LibraryId")
应该
// BookMap
.ParentKeyColumn("BookId")
.ChildKeyColumn("LibraryId")
// LibraryMap
.ParentKeyColumn("LibraryId")
.ChildKeyColumn("BookId")
内容总结
以上是互联网集市为您收集整理的c# – Fluent NHibernate – HasManyToMany NHibernate.MappingException:映射集合中的重复列全部内容,希望文章能够帮你解决c# – Fluent NHibernate – HasManyToMany NHibernate.MappingException:映射集合中的重复列所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错,欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 gblab@vip.qq.com 举报,一经查实,本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。