Queryable Function or Procedure for a Chart?

Question

I have a complex query that I use to generate different pie charts in APEX.
All that changes from one chart to another is the column that is being queried (i.e. OS, Platform, etc)
For maintainability I would rather have this be a single query w/ a method to substitute the value being queried upon.
Any suggestions for doing so? Is there some form of queryable function or procedure?
[Because of the way I list multiple charts per page, I would not want to just have a single chart for all values.]
Here is a sample query.
select link, os, decode(:P421_COUNT_BY,'CPUs',percent_cpu,percent) value
from (
select 'f?p=&FLOW_ID.:6:&SESSION.::::P1_OS:'||i.os link, i.os,
count(*) num,
round(count(*)*100/(sum(count(*)) over())) percent,
sum(nodes*nvl(cores,1)*nvl(cpus_per_node,1)) cpus,
round(sum(nodes*nvl(cores,1)*nvl(cpus_per_node,1))*100/(sum(sum(nodes*nvl(cores,1)*nvl(cpus_per_node,1))) over())) percent_cpu
from customers c, country_region_mapping m, systems i, oracle_versions ov
where c.country = m.country
and c.customer_id = i.customer_id
and ov.version(+)=i.oracle_version
and (:P421_SHOW='Yes' or (i.system_status='Production'))
and (:P421_NODES='BOTH' or :P421_NODES is null or (:P421_NODES='SINGLE' and i.nodes=1) or (:P421_NODES='RAC' and i.nodes>=2))
and (i.os=:P421_OS or :P421_OS is null or :P421_OS='All')
and (m.country=:P421_COUNTRY or :P421_COUNTRY is null or :P421_COUNTRY='All')
and (m.region=:P421_REGION or :P421_REGION is null or :P421_REGION ='All')
and (c.industry=:P421_INDUSTRY or :P421_INDUSTRY is null or :P421_INDUSTRY='All')
and (ov.major=:P421_ORACLE_RELEASE or :P421_ORACLE_RELEASE is null or :P421_ORACLE_RELEASE='All')
and i.os is not null
and i.os not in ('unknown','Not Sure')
group by os)
where decode(:P421_COUNT_BY,'CPUs',percent_cpu,percent) >= 1
order by decode(:P421_COUNT_BY,'CPUs',percent_cpu,percent) desc

Answer 1

Hi Erik,
I wrote a blog post about generic charting a while back that you might (or might not!) find useful -
http://jes.blogs.shellprompt.net/2006/05/25/generic-charting-in-application-express/
Hope this helps,
John.