Displaying the column values of a wizard-generated form

Question

Hello,
I created a Master-Detail page following the examples in the various Apex guides. The form is not working correctly, unfortunately. When I click the Add Row button a row is added at the bottom of the table. Once I enter data into that row and click the Apply Changes button I get an SQL Insert error. I understand error message; a hidden column is not getting populated. Having said all that, that is not my problem.
My problem is understanding how APEX is storing the data it displays in the table so I can manipulate it to place a value into that hidden column.
I read many posts about how data is stored in the fxx arrays. I've looked at my source and have seen values like f02, f03, f03_0004 and so on. So, I tried creating a report to display the contents of APEX_APPLICATION.G_F03(1). I created another report on the same page with the following SQL statement:
SELECT 'Code: '||apex_application.g_f03(1) F1
FROM DUAL;
When I run the page, the second report shows this: ORA-06553: PLS-221: 'G_F03' is not a procedure or is undefined.
Someone (I think Denes) suggest creating a process with the following PL/SQL to help locate the correct array:
BEGIN
wwv_flow.debug('******************************');
wwv_flow.debug('*** STARTING MY DEBUG HERE ***');
wwv_flow.debug('1: ' || APEX_APPLICATION.G_F01(1));
wwv_flow.debug('2: ' || APEX_APPLICATION.G_F02(1));
wwv_flow.debug('3: ' || APEX_APPLICATION.G_F03(1));
wwv_flow.debug('4: ' || APEX_APPLICATION.G_F04(1));
wwv_flow.debug('5: ' || APEX_APPLICATION.G_F05(1));
wwv_flow.debug('*** ENDING MY DEBUG HERE ***');
wwv_flow.debug('******************************');
END;
With that process in place, whenever I run the page I get an error that says ORA-01403: no data found. When I comment out the five lines that reference APEX_APPLICATION.G_Fxx the page runs, but I cannot see the remaining debug comments UNLESS I place the process to run before or after the Footer.
I hope that all makes sense.
So, what am I doing wrong about displaying the contents of the array that is storing the table?
Respectfully,
Leon

Answer 1

You can't reference a package variable in a SQL statement like you do in:
SELECT 'Code: '||apex_application.g_f03(1) F1
FROM DUAL;
You can only reference it in a PL/SQL block (like you did in a Before/After Footer process). If you try to use the variables before they are instantiated you'll get the no-data-found error.