Form based on a denormalized table

Question

I have a denormalized table. And the form has 2 data blocks, header and detail.
The header is a 'From clause query', which is actually distinct of a few columns. Detail is direct to the table.
Understanding that it is not possible to update the header directly, is there any method that can simulate a header-detail relationship. That is when user change something on the header, that change will automatically propagate to the related detail records.
Thanks in advance!

Answer 1

Hello,
Well, the task can be achieve by following the below steps. But i would like to know the need of this task.
Anyway if you need it badly here is a way. Not very pretty. But you can use.
1. Go to the property pallet of From Clause Query block and set the DML TARGET TYPE to NONE and DML TARGET NAME to blank (do not specify any value).
2. On From Clause Query block which is header create two trigger (block-level) called ON-UPDATE and ON-LOCK and write the code inside like this.
NULL;3. In last create one trigger on form-level called KEY-COMMIT and use the code like this...
IF :header_block.customer_id!=:detail_block.customer_id THEN
  UPDATE table_name
  SET customer_id = :header.customer_id
  WHERE order_number = :header_block.order_number
  AND customer_id = :detail_block.customer_id;
END IF;
COMMIT;So, while updating the header block and when you will press save it will execute this update statement which is on form-level trigger. And will update the data in actual table which is detail table. So, no need of query again. It will work as it is. And if you want to update the detail table as normal form's practice you can also it will work as normal behaviour and will not execute that update statement.
Keep the relation between blocks as it is.
In addition if you don't use form then through backend it is very easy to create one view using the query which you are using for block and then use INSTEAD OF trigger to update the actual table.
-Ammad