Error messages in notification box

Question

Hi, I have a process that delete a selected record in a list. The process is triggered when the user click on a link in a list of status that put an ID in the session an assign 'DELETE' to &REQUEST. The process is located in the after-header section and could raise an integrety constraint exception.
If the record has no child, everything runs OK and a message, 'Delete completed' is printed in the notification box at the top of the page. But when an error occurs, any child found, the user is redirected to a page where one reads 'Integrety constraint violated ...' and the message included in the error message section of the process. The user than click on the OK link and is redirected to the preceding status list. How could I get the error message to be print in the notification box ?
I already tried create a fake hidden button that is trigger but I can't put the needed ID in the session. I also tried put the process in the after submit section. Is there any solution ?
Thanks

Answer 1

Hi user523491,
You need to make a validation on the page that checks if any child rows exists. You simply make a select that checks.
Most Oracle people are used to catching exceptions in PL/SQL for things like this, but for some strange reason it is not possible to catch exceptions in APEX unless you code the DML yourself. This is one most annoying things with the product. It’s a mystery to me how a database based products with a lot of PL/SQL don’t have exception handling build in.
But for now you have to write a lot of SQL ofPL/SQL to check your integrity constraint and make extra round trips to the database. :-)
You can read about validations here: http://download-uk.oracle.com/docs/cd/B31036_01/doc/appdev.22/b28550/bldr.htm#sthref515
Maybe somebody from the development team can shed some light on how this came to be. I would be very interesting to hear.
Regards Pete