C# - Using A Trigger To Record Audit Information Vs. Stored Procedure?
Apr 19, 2010
Suppose you have the following... An ASP.NET web application that calls a stored procedure to delete a record. The table has a trigger on it that will insert an audit entry each time a record is deleted. I want to be able to record in the audit entry the username of who deleted the record. What would be the best way to go about achieving this? I know I could remove the trigger and have the delete stored procedure insert the audit entry prior to deleting but are there any other recommeded alternative?
If a username was passed as a parameter to the delete stored procedure, is there anyway to get this value in the trigger that's excuted when the record is deleted? I'm just throwing this out there...
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I'm using VB.net 2.0 with a SQL server (2005) backend db. I've got a very odd problem. I'm trying to use a stored procedure with a parameter to delete a record from a table. I've tested the stored procedure by running it directly from visual studio and it works fine, but when running it through my application nothing happens. There's no error and it appears to have worked but the record is not deleted.
I've checked permissions on the backend db and giving the network ASPNet account the db owner role has no effect either.
Here's the code, there are 3 layers - the webform code, then the business logic class, then the dataconnection class.
'firstly the original code that is run from the webform when the user selects to delete the record
Partial Public Class NewPerson
Inherits System.Web.UI.Page
Private newConn As New DBConnection
Private currentNewRequest As New NewRequest(newConn)
Protected Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
Dim requestID As Integer = CInt(Me.lblRecordID.Text)
Me.currentNewRequest.newRequestID = requestID
Me.newConn.openConnection()
Me.currentNewRequest.DeleteRecord()
Me.newConn.closeConnection()
End Sub
End Class
'the business logic class that is called to set the parameters etc. The newRequestID integer is set at 19, I have checked this out.
Public Class NewRequest
Private dBConnection As DBConnection
Public newRequestID As Integer
Public Sub New(ByVal dBConnection As DBConnection)
'check params
If dBConnection Is Nothing Then
Throw New ArgumentNullException("dBConnection")
End If
Me.dBConnection = dBConnection
End Sub
Public Sub DeleteRecord()
'This sub deletes a request
With Me.dBConnection
.AddParameter("@newrequestID", SqlDbType.Int, 0, newRequestID)
.ExecNonQuerySP("sp_DeleteNewRequest")
End With
End Sub
End Class
'then the data connection class
Imports System.Data.SqlClient
Public Class DBConnection
Private _ParamList As SqlParameterCollection
Private _MyComm As New SqlCommand
Private _ConnectionStr As String = ConfigurationManager.ConnectionStrings("Conn").ToString
'shared connection
Dim conn As New SqlConnection(_ConnectionStr)
'the parameter is added
Public Sub AddParameter(ByVal ParamName As String, ByVal paramType As Data.SqlDbType, ByVal Paramlength As Int16, ByVal ParamValue As String)
MyComm.Parameters.Add(ParamName, paramType, Paramlength)
If ParamValue = Nothing Or ParamValue = "00:00:00" Or ParamValue = "" Then
_MyComm.Parameters(ParamName).Value = DBNull.Value
Else
_MyComm.Parameters(ParamName).Value = ParamValue
End If
End Sub
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Public Sub ExecNonQuerySP(ByVal SPName As String)
Dim MyAdapter As New SqlDataAdapter(_MyComm)
_MyComm.CommandType = CommandType.StoredProcedure
_MyComm.CommandText = SPName
_MyComm.Connection = conn
If Not _MyTrans Is Nothing Then
_MyComm.Transaction = _MyTrans
End If
Try
_MyComm.ExecuteNonQuery()
Catch ex As Exception
Dim errorMessage As String = ex.GetType.ToString & " " & ex.Message.ToString
System.Web.HttpContext.Current.Session("DBError") = "True"
System.Web.HttpContext.Current.Session("DBEx") = errorMessage
Throw ex
Finally
End Try
End Sub
Public Sub openConnection()
conn.Open()
End Sub
Public Sub closeConnection()
conn.Close()
End Sub
End Class
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ALTER PROCEDURE sp_DeleteNewRequest
/*this sp is used to delete a new account request record*/
@newrequestID int
AS
DELETE FROM NewAccountRequest WHERE
NewRequestID = @newrequestID
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[Code]....
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[Code]....
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[Code]....
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[Code]....
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[Code]....
[Code]....
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[Code]....
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[code]...
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[Code]....
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