Oracle Apex 5：使用PL / SQL将值插入页面项

Question

I'm trying to create an auto-incrementing Primary Key for a questionnaire created by a wizard. The problem is, that I need the Primary Key to be inserted into the page item P2_ID (which is a hidden item) during the pre-render stage, so that I can have an ARF process run on each section of the questionnaire to allow the employees to go back and change their answers.

I can't seem to use a trigger, as that implements on submit, and I'd like the PK to populate as the session begins.

Currently, I have a process running in the pre-render stage with this PL/SQL code:

begin
    select SEQ_UAT.nextval into :P2_ID from dual;
end;

But no matter what I do, I can't seem to get this very simple PL/SQL code to populate the P2_ID page item!

Any ideas?

Answer 1

thanks for answering.

I was able to figure it out somehow. Basically, I removed the ARP I had running and made it a PL/SQL function, this allowed me to create a pre-render PL/SQL process to create a PK using seq.nextval.

Not sure why, but it seemed that the ARP just wouldn't work with the seq.nextval!

Answer 2

Not sure why that isn't working, but you could just use MAX(pk_id)+1 . If you use seq.nextval it will increment every time the user refreshes page etc.

Edit: couldn't you also just set :P2_id's source to sql query and populate from there?