Data Transformation Services (DTS)
February 27, 2000
We all use the standard DTS Tasks within our packages, but sometimes we need that little bit more. The first choice is
to write an ActiveX Script Task to do the job, and this usually suffices. Unfortunately
there are some limitations as to what you can do, the most obvious being the inability to define variables as types.
The other problem is one of maintenance, as the script must be maintained in
every package that requires this custom functionality.
This is where CustomTasks can be used. Once written and registered, a CustomTask is available for use in all
packages straight from the Designer Toolbar.
Unfortunately with the method outlined below, properties for the CustomTask are unavailable for manipulation within VBScript.
For a better introduction to CustomTasks, have a look at the
SQL Server Magazine article Constructing DTS Custom Tasks
On with the guide:
Create a new ActiveX DLL project. The sample project is called MyCustomTask, and the class is called CustomTask.
Reference the Microsoft DTS Package Object Library (Project->References menu).
You can now start adding code to your class as described below -
First you must setup the CustomTask interface via the Implements statement,
and declare the two required properties, Name & Description.
If you have any properties of your own, then declare them here as well.
'Required for CustomTask
'Required Custom Task Properties
Public Description As String
Public Name As String
'Define your own CustomTask Properties here
Public MyProperty As String
Next set up the property handling for the required properties
Private Property Get CustomTask_Name() As String
CustomTask_Name = Name
Private Property Let CustomTask_Name(ByVal vNewValue As String)
Name = vNewValue
Private Property Get CustomTask_Description() As String
CustomTask_Description = Description
Private Property Let CustomTask_Description(ByVal vNewValue As String)
Description = vNewValue
Let DTS handle your CustomTask properties for you
Private Property Get CustomTask_Properties() As DTS.Properties
Set CustomTask_Properties = Nothing
Create the Execute Method for your CustomTask
Private Sub CustomTask_Execute(ByVal pPackage As Object, _
ByVal pPackageEvents As Object, _
ByVal pPackageLog As Object, _
pTaskResult As DTSTaskExecResult)
'Handle any Error
On Error Goto ExecuteError
'Set Result Flag to assume success
pTaskResult = DTSTaskExecResult_Success
'Put your processing code here
'Put some more for luck
'Set the Result Flag to Failure
pTaskResult = DTSTaskExecResult_Failure
'Clean up any objects here
Using the template above you can successfully build a simple CustomTask, which is perfectly usable.
By default DTS will implement a simple grid which enables you to view and set properties of the CustomTask, but our
next stage is to enhance the usability and of the Task, by adding a user interface for these properties-