NHibernate / Castle activerecord：如何获取导致数据库异常的对象？

Question

我能否以某种方式获取导致 GenericADOException（约束异常）的对象？

或者我怎样才能只刷新一个对象，这样我就可以知道哪个对象出了问题。

我有一个以表单显示的对象列表，可以编辑和添加。 在刷新时，它给了我一个数据库异常，但我无法分辨哪个对象给出了异常。

我无法将约束移至休眠状态。

Answer 1

您尝试过使用 NHibernate Profiler 吗？ 它应该为您提供有关问题所在的更多详细信息。

Answer 2

通过一些谷歌搜索，我找到了一篇有用的帖子，然后通过阅读 nhibernate 源代码，我得到了以下内容：

http://fabiomaulo.blogspot.com/2009/06/improving-ado-exception-management-in.html

---

'http://fabiomaulo.blogspot.com/2009/06/improving-ado-exception-management-in.html
'properties.Add("sql_exception_converter", "SmartCore.SmartDatabaseExceptionConverter, SmartCore")
Class SmartDatabaseExceptionConverter
    Implements ISQLExceptionConverter


    Public Function Convert(ByVal sqlException As System.Exception, ByVal message As String, ByVal sql As NHibernate.SqlCommand.SqlString) As NHibernate.ADOException Implements NHibernate.Exceptions.ISQLExceptionConverter.Convert

        Dim sqle As DbException
        sqle = ADOExceptionHelper.ExtractDbException(sqlException)
        '"could not update: [SmartCore.GL.Glaccount#1225]"
        Dim obname As String
        Dim key As String
        obname = ExtractUsingTemplate("could not update: [", "#", message)
        key = ExtractUsingTemplate("#", "]", message)

        Dim prikey As Integer
        prikey = Integer.Parse(key)

        sqle.Data.Add("obname", obname)
        sqle.Data.Add("prikey", key)

        If sqle.ErrorCode = 335544558 Then
            '"Operation violates CHECK constraint C_GLACCOUNT on view or table GLACCOUNT At trigger 'CHECK_56'"
            Dim checkname As String
            checkname = ExtractUsingTemplate("Operation violates CHECK constraint ", "on view or table ", sqle.Message)
            Return New SmartDatabaseConstraintException(message, sqle, obname, prikey, checkname)
            'Return New ConstraintViolationException(message, sqle, sql, checkname)
        End If

        Return SQLStateConverter.HandledNonSpecificException(sqlException, message, sql)
    End Function



    Protected Function ExtractUsingTemplate(ByVal templateStart As String, ByVal templateEnd As String, ByVal message As String) As String
        Dim templateStartPosition As Integer = message.IndexOf(templateStart)
        If templateStartPosition < 0 Then
            Return Nothing
        End If

        Dim start As Integer = templateStartPosition + templateStart.Length
        Dim [end] As Integer = message.IndexOf(templateEnd, start)
        If [end] < 0 Then
            [end] = message.Length
        End If

        Return message.Substring(start, [end] - start).Trim()

    End Function
End Class

---

'USAGE
        Try
            _scope.Flush()
        Catch ex As SmartDatabaseConstraintException
            If ex.ConstraintName = "C_GLACCOUNT" Then
                Dim gla As GL.Glaccount
                gla = GL.Glaccount.Find(ex.EntityId) 'should be fast from entity cache
                msgboxError(gla.description & " is duplicate please rename")
            Else
                msgboxError(ex.Message)
            End If
        End Try

---

我必须调整它以适应我的工作稍微过时的 nhibernate 版本（3 月份的 2.1）我将不得不稍微调整上面的内容以适应较新的版本，其中有一个 AdoExceptionContextInfo 可以从中获取对象名称和 ID。 冬眠不错啊！