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Modifying the Master Datastream Component

This task is a step in Process of Using Composite Datastreams in a Report.

In this topic, you modify the master datastream component so that it can obtain the data for its data row component from the global data row variable. This is accomplished by overriding the Fetch method on the master datastream.

After determining the fetched record is not empty, the code in the Fetch method sets the MasterRow global variable to the contents of the row returned by the Super::Fetch operation. Each time a master datastream record is obtained, the record in memory in MasterRow is replaced.

To override the Fetch method on the master datastream

1. Click the master datastream tree.

   In the Quotestd.rod report, this is ssQuoteQueryAddGlobalRow.

2. In the Properties window, choose the Methods tab.
3. Double-click the Function Fetch() As AcDataRow function.
4. In the Method Editor window, replace the existing code with the following code:

      Function Fetch( ) As AcDataRow

      Dim aMasterRow As ssQuoteDataRow

         Set aMasterRow = Super::Fetch( )

         If aMasterRow Is Nothing Then

            Exit Function

         End If

         Set MasterRow = aMasterRow

         Set Fetch = MasterRow

      End Function

   If you are using other than ssQuoteDataRow, replace the appropriate master data row name.

5. From the application-level menu, choose File, and then Save.