key-many-to-one和key-property关联:nhibernate不会从set中删除项目

Question

我会尽量保持这种简洁,但希望不要错过任何重要信息.我相信的代码提供了所有细节,但我遗漏了噪音(这是VB,所以有很多噪音:)).

"Case"对象有许多"赋值":

Public Class Case
  Property CaseId As Guid 
  Property Assignments As ISet(Of CaseAssignment)
End Class

Public Class CaseAssignment
  Property Case As Case
  Property RoleId As Guid
End Class

我已经交过的数据模型看起来与你期望的一样,除了CaseAssignment是一个复合键:

table Case
   CaseId uniqueid not null primary key
   ...

table CaseAssignment
   CaseId uniqueid not null
   RoleId uniqueid not null
   PK := (CaseId, RoleId)
   FK from CaseId -> Case.CaseId

最后,Fluent NHibernate映射:

Class CaseMapping
  Public Sub New()
    Table("Case")
    KeyColumn("CaseId")
    HasMany(Function(x) x.Assignments).KeyColumn("CaseId").Cascade.AllDeleteOrphan()
End Class

Class CaseAssignmentMapping
  Public Sub New()
    Table("CaseAssignment")
    CompositeId() _
      .KeyReference(Function(x) x.Case, "CaseId") _
      .KeyProperty(Function(x) x.RoleId)
End Class

KeyReference与XML映射术语中的"key-many-to-one"相关联.

当我为一个案例添加任务时,一切都很好,但当我删除引用时,我会遇到两个问题之一.使用此代码:

aCase.Assignments.Remove(someAssignment)
caseRepository.Save(aCase)

我得到的错误是,"无法删除集合行...无法将值NULL插入列'CaseId',表'CaseAssignments';列不允许空值.UPDATE失败.语句已被终止." 这是因为尝试发出以下SQL:

UPDATE CaseAssignments SET CaseId = null
WHERE CaseId = @p0 AND RoleId = @p1 AND CaseId = @p2
@p0=[valid guid #1],
@p1=[valid guid #2],
@p2=[valid guid #1 again] **!?!**

所以这有点搞砸了.所以我试试这段代码:

aCase.Assignments.Remove(someAssignment)
someAssignment.Case = Nothing
caseRepository.Save(aCase)

并且错误是"意外的行数:0;预期:1"因为NHibernate试图:DELETE FROM CaseAssignments WHERE RoleId = [valid guid] AND CaseId = NULL

我一直在搜索线程和论坛以及NHibernate和Hibernate文档,并且还没有真正遇到类似的东西.希望这很简单.感谢任何对此拍摄的人!

Answer 1

几天前我遇到了同样的问题.解决方案是在CaseMapping类的CaseAssignments集合中将"inverse"属性设置为"true".像这样:

HasMany(Function(x) x.Assignments).KeyColumn("CaseId").Cascade.AllDeleteOrphan().Inverse()

据我所知,你必须同时将AllDeleteOrphan级联类型和Inverse属性设置为true才能生效.

我希望它有效!