Hl Guys,
我正忙于为现有系统编写后端管理程序。我选择 NHibernate 作为我的数据访问解决方案，并且对它还很陌生。我在父/子关系中遇到以下错误：
NHibernate.StaleStateException：意外的行数：0；预计：1
此错误是由于在我的源代码中将新的子对象添加到父级的 MeetingAdministrators 子级集合中而引起的。当我保存父对象时，我希望子对象也被添加，但是仅为父对象生成 INSERT。 Nhibernate 不会为子进程生成 INSERT，而是尝试更新子进程，即使它不存在。因此它会显示上面显示的错误消息。我在网络和 nhibernate 文档中到处查看了这种情况，但没有找到任何帮助。大多数代码涉及不属于主键的外键，或者人们似乎正在处理一对一或多对多关系。我需要指定映射和代码，以便在插入父级时，也会插入子级。请帮忙。
我的数据结构如下：
会议——家长桌
- MeetingID (pk) (int, 身份)
- 描述
- 开始日期
- IsActive
- Venue
会议管理员 - 子桌
- 会议ID (pk, fk)
- AdminNetworkID (pk) (varchar)
- 创建日期
- IsActive
这是 Visual Basic .NET 源代码：
<Serializable()> _
Public Class MeetingAdministrator
Private _MeetingID As Integer
Public Overridable Property MeetingID() As Integer
Get
Return _MeetingID
End Get
Set(ByVal value As Integer)
_MeetingID = value
End Set
End Property
Private _AdminNetworkID As String
Public Overridable Property AdminNetworkID() As String
Get
Return _AdminNetworkID
End Get
Set(ByVal value As String)
_AdminNetworkID = value
End Set
End Property
Private _IsActive As Byte
Public Overridable Property IsActive() As Byte
Get
Return _IsActive
End Get
Set(ByVal value As Byte)
_IsActive = value
End Set
End Property
Private _DateCreated As Date
Public Overridable Property DateCreated() As Date
Get
Return _DateCreated
End Get
Set(ByVal value As Date)
_DateCreated = value
End Set
End Property
Private _LastModified As Date
Public Overridable Property LastModified() As Date
Get
Return _LastModified
End Get
Set(ByVal value As Date)
_LastModified = value
End Set
End Property
Private _meeting As Meeting
Public Overridable Property Meeting() As Meeting
Get
Return _meeting
End Get
Set(ByVal value As Meeting)
_meeting = value
End Set
End Property
Public Overrides Function Equals(ByVal obj As Object) As Boolean
Return MyBase.Equals(obj)
End Function
Public Overrides Function GetHashCode() As Integer
Return MyBase.GetHashCode()
End Function
End Class
Imports Iesi.Collections
Imports Iesi.Collections.Generic
Public Class Meeting
Private _MeetingID As Integer
Private _Description As String
Public Overridable Property MeetingID() As Integer
Get
Return _MeetingID
End Get
Set(ByVal value As Integer)
_MeetingID = value
End Set
End Property
Public Overridable Property Description() As String
Get
Return _Description
End Get
Set(ByVal value As String)
_Description = value
End Set
End Property
Private _StartDate As Date = Now
Public Overridable Property StartDate() As Date
Get
Return _StartDate
End Get
Set(ByVal value As Date)
_StartDate = value
End Set
End Property
Private _IsActive As Byte
Public Overridable Property IsActive() As Byte
Get
Return _IsActive
End Get
Set(ByVal value As Byte)
_IsActive = value
End Set
End Property
Private _DateCreated As Date
Public Overridable Property DateCreated() As Date
Get
Return _DateCreated
End Get
Set(ByVal value As Date)
_DateCreated = value
End Set
End Property
Private _Venue As String
Public Overridable Property Venue() As String
Get
Return _ Venue
End Get
Set(ByVal value As String)
_ Venue = value
End Set
End Property
Private _meetingAdministrator As ISet(Of MeetingAdministrator)
Public Overridable Property MeetingAdministrators() As ISet(Of MeetingAdministrator)
Get
Return _meetingAdministrator
End Get
Set(ByVal value As ISet(Of MeetingAdministrator))
_meetingAdministrator = value
End Set
End Property
Public Overridable Sub AddAdministrator(ByVal meetingAdministrator As MeetingAdministrator)
meetingAdministrator.Meeting = Me
_meetingAdministrator.Add(meetingAdministrator)
End Sub
Public Sub New()
_meetingAdministrator = New HashedSet(Of MeetingAdministrator)()
End Sub
End Class
以下是映射文件：
<!-- Meeting.hbm.xml -->
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Data"
namespace="Data.Domain" >
<!-- Mapping Information -->
<class name="Meeting" table="Meeting" >
<id name="MeetingID" column="MeetingID" type="int">
<generator class="identity" />
</id>
<property name="Description" />
<property name="StartDate" />
<property name="IsActive" />
<property name="Venue" />
<set name="MeetingAdministrators" table="MeetingAdministrator" inverse="true" lazy="true" cascade="save-update" access="property" >
<key column="MeetingID" foreign-key="MeetingID" />
<one-to-many class="Meeting" />
</set>
</class>
</hibernate-mapping>
<!-- MeetingAdministrator.hbm.xml -->
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Data"
namespace="Data.Domain" >
<!-- Mapping Information -->
<class name="MeetingAdministrator" table="MeetingAdministrator" >
<composite-id>
<key-property name="AdminNetworkID" column="AdminNetworkID" type="string" >
</key-property>
<key-many-to-one name="Meeting" class="Meeting" >
<column name="MeetingID" />
</key-many-to-one>
</composite-id>
<property name="IsActive" />
<property name="DateCreated" />
</class>
</hibernate-mapping>
收到相同的错误消息，但它是由删除触发的。原因很简单，该条目之前已经被删除了。
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