V tem članku so ti imenski ogrodje .NET Framework Microsoft ogrodje .NET Framework Class Library:
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System.Data
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System.Data.OleDb
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System.Data.SqlClient
Znaki
Če v storitvi SQL Server (OLEDBSQL) uporabite ponudnika Zbirke podatkov Microsoft OLE za ADO.NET, se ob poskusu zagona več transakcij v seji prikaže to sporočilo o napaki:
System.Data.OleDb.OleDbException: V tej seji ni mogoče začeti več transakcij
Razlog
Ponudnik zbirke podatkov OLE za SQL Server omogoča ugnezdenih transakcij.
Več informacij
Steps to Reproduce the Behavior
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Zaženite Microsoft Visual Studio .NET.
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Ustvarjanje projekta Windows Application v Visual Basic .NET. Obrazec1 je privzeto ustvarjen.
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Dvokliknite Obrazec1, da odprete okno Koda.
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Zamenjajte kodo v form1 s to kodo:
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Public Class Form1
Inherits System.Windows.Forms.Form
Dim cn As New OleDb.OleDbConnection()
Dim cmd As New OleDb.OleDbCommand()
Dim mycmd As New OleDb.OleDbCommand()
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.Container
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Name = "Form1"
Me.Text = "Form1"
End Sub
#End Region
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
cn.ConnectionString = "Provider=SQLOLEDB;Data Source=YourServer;" & _
"Initial Catalog=pubs;User ID=YourUserID;Password=YourPassword"
cn.Open()
cmd.Connection = cn
mycmd.Connection = cn
cmd.CommandText = "Insert into stores (stor_id) values('9876')"
Dim myTrans As OleDb.OleDbTransaction
myTrans = cn.BeginTransaction(IsolationLevel.ReadCommitted)
cmd.Transaction = myTrans
Try
cmd.ExecuteNonQuery()
myTrans.Begin()
myTrans.Commit()
Catch ex As Exception
MessageBox.Show(ex.ToString)
End Try
End Sub
End Class -
Spremenite niz povezave, kot ustreza vašemu okolju.
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Zaženite program. Opazite lahko, da se prikaže napaka, navedena v razdelku »Znaki«.
Reference
Če želite dodatne informacije, kliknite spodnjo številko članka, da si ogledate članek v Microsoftovi zbirki znanja:
306649 PRB: Napaka pri izvajanju ugnezdene transakcije s ponudnikom zbirke podatkov OLE za SQL ponudnika