在wincc sql server 中建立了一个自己的表，要对此表修改操作。执行会抛出异常，代码如下(VB.NET 2005)：
sCon1="Provider=WinCCOLEDBProvider.1;Catalog=CC_HL_08_06_17_12_56_04R;
Data Source = .\WinCC;"

sSQL1 = "ALARMVIEW:update tt set tt =12 "

conn1 = New ADODB.Connection 'connecting
conn1.Open(sCon1)

oCom1 = New ADODB.Command
oCom1.CommandType = 1
oCom1.ActiveConnection = conn1

Try
oCom1.CommandText = sSQL1
oCom1.Execute()

Catch ex As Exception
MsgBox(ex.Message)
End Try

错误提示为{"异常来自 HRESULT:0x80047102"} System.Exception

请问是什么问题，谢谢各位!