Cascading LOVs (APEX 4.1) problem, using in report does not set values

Question

Hi,
i am using APEX 4.1.0.00.32 and i have a simple report as
SQL:*
SELECT * from region
WHERE region like '%'||P3_REGION||'%'
and country like '%'||P3_COUNTRY||'%'
and city like '%'||P3_CITY||'%'
Items:*
P3_REGION:
select distinct region as d, region as r from region
Display Null value: YES
Null display value: - select -
Null return value: +0+
P3_COUNTRY:
select distinct country as d, country as r from region where region = :P3_REGION
Display Null value: YES
Null display value: - select -
Null return value: +0+
Cascading LOV Parent Item(s): P3_REGION
P3_CITY:
+select distinct city as d, city as r from region where country = :P3_COUNTRY
Display Null value: YES
Null display value: - select -
Null return value: +0+
Cascading LOV Parent Item(s): P3_COUNTRY
The LOVs work fine and the correct values are displayed if cascading through them
So in the last step i want to filter the report with the values that were selected in the lovs. And this i get not working.
I tried to add a button with SUBMIT of the page. After choosing values in all LOVs and clicking the SUBMIT button the page submits, alle LOVs are cleared (with value - select -) and the report shows all rows.
I tried to change the button to "redirect to Page 3" and setting the values P3_REGION, P3_COUNTRY, P3_CITY to &P3_REGION., &P3_COUNTRY., &P3_CITY. but without success.
I tried to use the setting "Page Action when Value Changed" to "Submit" and/or "Redirect and set value" for all Item LOVs and/or only the last item LOV, but then the cascade of the LOVs does not work properly and the report does not change too.
I am confused as i don´t know what i can do until now. I think this should be an easy requirement to limit/filter the report with values in the LOVs.
Furthermore it should be possible to choose only the region LOV and then limit the report with that region (without choosing country and city)
Thanks in advance!

Answer 1

Hi Dan,
thank you for your answer. I have the solution now from Kleber_M, this works.
Dan McGhan wrote:
1. Use bind variables in my query. It would look something like:
SELECT *
FROM region
WHERE region LIKE '%'|| :P3_REGION ||'%'
AND country LIKE '%'|| :P3_COUNTRY ||'%'
AND city LIKE '%'|| :P3_CITY ||'%'
This was only a mistake when writing the post, i forgot the colon. I use bind variables of course.
2. Make sure you have a comma separated list of item names that the report depends on beneath the SQL Query where it says Page Items to Submit. This will make sure that the value of those items on the page are bound into session state prior to the query executing.I tried this, too, but without success...
3. Use Dynamic Actions to perform the refresh action when any of the three items changes. This would be both more performant and a better experience for the end user than a full page refresh.How can i do this. This sounds good, because when refreshing the page often some items oder actions are done that i don´t want to.
Regards,
Matze