View a report, divided into 3 sections (3 reports, 1 query)

Hello

I'm trying to divide a report based on a selection of views.
It is quite a heavy SQL statement so that want to run it once.
I want to divide it into summary info, cost information and income info.
Ideally I would have just 3 reports with the same selection and select the columsn I want
But for efficiency, I want only to run the sql once.
I don't know how if there is no database caching which would make this sweater cache?
My other option is to load the query into a collection and then interrogate the collection 3 times.
But then I have to map all C001, C002... for correct columsn names etc.

You are looking for just a few tips on best practices for this (or if there is a smart way to divide the reports I was not aware of!) :))

Thank you
Richard

I had a similar problem. I solved by using APEX_COLLECTION to house data and referenced in various parts of the report on the page. First, I created a process of PL/SQL in the section BEFORE_HEADER of the page to generate the collection:

declare

   vQuery varchar2( 32767 );

begin

   if apex_collection.collection_exists( 'MyCollection' ) then
      apex_collection.delete_collection( 'MyCollection' );
   end if;

   vQuery := 'INSERT QUERY HERE'; 

   apex_collection.create_collection_from_query( 'MyCollection', vQuery, 'NO' );

end;

You will notice that I check whether the collection already exists and if so, I remove it before you refresh the data. You will need to do this to avoid triggering an error because APEX_COLLECTION with to throw an error if you try to create a new collection with the same name as an existing collection. If your data doesn't change very often during a session, you can also use this logic to see if the collection already exists and avoid to re-run the query altogether.

Also, don't forget that if your query relates to the city of strings, place 2 single quotes in the string, as

'select * from CONTACTS where name = ''Smith'' and status = 1'

Then, in the parts of your report, you can query the collection to help:

select C001 as NAME,
       N001 as STATUS
  from APEX_COLLECTIONS
 where COLLECTION_NAME = 'MyCollection'
   and ...

Remember that there is a specific order for the columns according to the type of data, you will need to look at the docs to understand which columns organizes the data from your query. Take a look at http://download.oracle.com/docs/cd/E17556_01/doc/apirefs.40/e15519/apex_collection.htm#CJAIDBIC in order to better understand the positioning.

Hope this helps,
Jeff

Tags: Database

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