Data flows and unique columns.

Perhaps one too many 2000 DTS packages have permanently damaged my ability to think clearly - however, I've find myself very frustrated attempting to create a SSIS Data Flow which replaces a very simple 2000 DTS package.

Take data from table1 in database1, put it in table2 in database2. Table2 in Database2 has an additional column as part of the primary key - so I need to add an arbitrary unique value in each row as it's inserted. Previously, I did this in the transformation script through a variable I incremented.

What's the recommend method to do this now - since row level processing of variables seem to be a no-no?

A script component in the data flow will do what you want. The following script assumes that you grabbed the maxkey in the table BEFORE running the data flow. Then this script increments the maxkey by 1 and then starts incrementing for each row through the data flow.

Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper

Public Class ScriptMain
Inherits UserComponent
Private NextKey As Int32 = 0

Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)

Dim MaximumKey As Int32 = Me.Variables.MaxKey ' Grab value of MaxKey which was passed in

' NextKey will always be zero when we start the package.
' This will set up the counter accordingly
If (NextKey = 0) Then
' Use MaximumKey +1 here because we already have data
' and we need to start with the next available key
NextKey = MaximumKey + 1
Else
' Use NextKey +1 here because we are now relying on
' our counter within this script task.
NextKey = NextKey + 1
End If

Row.ClientKey = NextKey ' Assign NextKey to our ClientKey field on our data row
End Sub

End Class|||

Use a script task:

http://sqljunkies.com/WebLog/sqlbi/archive/2005/05/30/15684.aspx

|||

Hum. So it does work! I suppose I just did a fantastic job of screwing that up when I tried it the first few times.

thanks!