我想升级到流利的NHibernate 2.1(内部版本#694)。因此,我也升级到NHibernate 3.0。我遇到了“每个子表”映射的问题,这在尝试检索数据时会导致错误。流利NHibernate的1.2与SubclassMap导致“无行与给定的标识符”错误
这些表和类与现在已弃用的“Joined-Subclass”映射版本一起使用,该映射存在于先前版本的FluentNhibernate中,该版本允许子类拥有自己的唯一标识。
我已经削成码至其最小的部分,所以让我解释,通过代码,它会变得更加清晰:
以下是涉及到的表:
这里有类代表的表:
public class Field
{
public virtual int Id { get; set; }
public virtual string Code { get; set; }
public virtual string Description { get; set; }
}
public class MenuItem : Field
{
public virtual string NavigateUrl { get; set; }
}
public class UserLink
{
public virtual int Id { get; set; }
public virtual string ExternalLinkName { get; set; }
public virtual MenuItem MenuItem { get; set; }
public virtual int UserId { get; set; }
}
下面是相应映射:
public class FieldMap : ClassMap<Field>
{
public FieldMap()
{
Table("Field");
Id(x => x.Id, "ID").GeneratedBy.Identity();
Map(x => x.Code, "Code");
Map(x => x.Description, "Description");
}
}
public class MenuItemMap : SubclassMap<MenuItem>
{
public MenuItemMap()
{
Table("MenuItem");
Map(x => x.NavigateUrl, "NavigateUrl");
}
}
public class UserLinkMap : ClassMap<UserLink>
{
public UserLinkMap()
{
Table("UserLink");
Id(x => x.Id, "ID").GeneratedBy.Identity();
Map(x => x.ExternalLinkName, "ExternalLinkName");
Map(x => x.UserId, "User_ID");
References(x => x.MenuItem).Column("ID");
}
}
下面是测试:
[Test]
public void CanRetrieveUserLinks()
{
ISession session = GetSession();
DetachedCriteria criteria = DetachedCriteria.For(typeof (UserLink))
.Add(Restrictions.Eq("UserId", 1));
ICriteria executableCriteria = criteria.GetExecutableCriteria(session);
var userLinks = executableCriteria.List<UserLink>();
Assert.IsFalse(string.IsNullOrEmpty(userLinks[0].MenuItem.NavigateUrl));
session.Close();
}
当执行断言线,该SQL生成是不正确,因为它试图通过FIELD_ID查找,而不是ID的菜单项。因此,我收到错误:NHibernate.ObjectNotFoundException: No row with the given identifier exists[AS.AIMS.DomainModel.MenuItem#11]
首先生成SQL检索userLinks,这是正确的:
SELECT this_.ID as ID2_0_,
this_.ExternalLinkName as External2_2_0_,
this_.User_ID as User3_2_0_
FROM UserLink this_
WHERE this_.User_ID = 1 /* @p0 */
然后检索菜单项,它使用的,而不是ID FIELD_ID:
SELECT menuitem0_.Field_id as ID0_0_,
menuitem0_1_.Code as Code0_0_,
menuitem0_1_.Description as Descript3_0_0_,
menuitem0_.NavigateUrl as Navigate2_1_0_
FROM MenuItem menuitem0_
inner join Field menuitem0_1_
on menuitem0_.Field_id = menuitem0_1_.ID
WHERE menuitem0_.Field_id = 11 /* @p0 */
流利1.2/nh3.1今天就上线了。 http://fluentnhibernate.org/blog/2011/04/03/fluent-nhibernate-1.2-released – 4imble 2011-04-04 15:44:21
这不是你的完整代码,是吗? menuitem从子类映射到什么? – 2011-04-04 16:08:09
MenuItem是Field的子类。这是在类声明中定义的:'public class MenuItem:Field' – Pat 2011-04-04 16:18:26