Question

I have a parent-child relation setup between two tables. The parent table is setup with an auto increment value for its primary key. This is working fine and the new row in the parent DataTable is refreshed with the actual value of the key that was just inserted when I call Update on the TableAdaptor.

The problem is that the rows from the child table are not being inserted into the DB. For debug purposes, I added changesBefore and changesAfter to the code sample to see what changed rows exist in the child table. When I step through the code with a debugger, changesBefore constains the new child rows. changesAfter is Nothing. Its almost as if calling Update against the header table is triggering AcceptChanges on the child table.

I am familiar with insert/updating with DataTables and TableAdapters but this is my first attempt at using an autoincrement on a parent table. What am I missing here?

        Dim changesBefore = _ds.ResponseDetails.GetChanges

        headersTa.Update(_ds.ResponseHeaders)

        Dim changesAfter = _ds.ResponseDetails.GetChanges

        detailsTa.Update(_ds.ResponseDetails)

Answer 1

This is working now. Turns out there is an AcceptRejectRule property for each relation in a data set. I had the rule set to Cascade so it was basically cascading AcceptChanges down to the child table when Update was called against the parent. Changing the rule to None resolved my issue.

http://msdn.microsoft.com/en-us/library/system.data.acceptrejectrule(v=vs.80).aspx