Using HTMLDB_APPLICATION.G_F01 in a stored procedure

Question

I have a page with pl/sql function returning sql query report. The query works fine and produces a report with check boxes. The query looks like this:
SELECT HTMLDB_ITEM.CHECKBOX(1,material_code) export,
material_code, COUNT(*)
AS letters FROM du_materials
WHERE ... long where clause.
The query produces a nice report with checkboxes.
I placed a region button on the page which redirects to this URL:
#OWNER#.du_mailmerge.write_materials?user_id=871010501&one_many=MANY
The purpose of this stored procedure is to produce a file download.
The stored procedure looks like this:
PROCEDURE write_materials(user_id IN VARCHAR2,
one_many IN VARCHAR2) IS
BEGIN
FOR i IN 1..HTMLDB_APPLICATION.G_F01.COUNT LOOP
IF HTMLDB_APPLICATION.G_F01(i) IS NOT NULL THEN
write_mime_header(file_name=>HTMLDB_APPLICATION.G_F01(i) || '.csv');
write_table_data(HTMLDB_APPLICATION.G_F01(i));
END IF;
END LOOP;
END write_materials;
When I run the application and click the button, I get a blank page in the browser. Before I tried this, I used simple code that did not reference HTMLDB_APPLICATION and it worked fine. I have run some debugging code in the above procedure and find that HTMLDB_APPLICATION.G_F01.COUNT appears to be null or zero. There are no errors in the apache error log.
I have tried replacing HTMLDB_APPLICATION.G_F01.COUNT with
v('G_F01.COUNT'), that does not work either.
What's wrong? Is my syntax bad? Is the array not available to a stored procedure?

Answer 1

Thanks much for your response. I was afraid of that.
I quess I will have to go with this fallback plan:
1. put code in page process to create file use UTL_FILE.
2. Using the techniques in the How-to file export/import, import the whole file to clob, then export it.
3. delete import from table
4. return to my page.
This forum is great. Thanks to everyone who reads and responds to us newbies with HTML DB.