Using a function within a process flow...

Question

Hi,
I'm trying to figure out a way of using a function (or something else) to return a status before attempting to run a mapping. I'd like to have a table with all my mappings, start date, end date, status, etc.
1. SELECT status FROM table, if the mapping has already been executed do nothing, else execute the mapping, etc.
Is there a way to accomplish that in OWB flow ?
Thank you.
Gaétan

Answer 1

Hi,
We had a similiar set up in my previous role where we have a Process flow for each mapping. Under that processflow, before attempting to run the mapping we called function to check whether that particular mapping has been run successfully for that date. The function would take "PF Name" as an input and returns the status as 1 (return success - the mapping was not run, so has to be run today)
2 (return warning - the mapping is already run no need to run this time)
3 ( any fatal errors).
The function code is as below - _______________________________________________________
CREATE OR REPLACE FUNCTION "PUB_CHECK_RUN_STATUS"("IN_ETL_PROCESS_FLOW_NAME" IN VARCHAR2) RETURN NUMBER IS
--initialize variables here
lv_Current_Load_Id NUMBER;
lv_Last_Load_Id NUMBER;
BEGIN
     <<Check_PF_Status>>                    -- This block is Standard for all Loads Jobs
     BEGIN
          SELECT LOAD_ID
          INTO lv_Current_Load_Id
          FROM LOAD_ADMIN.LATEST_LOAD;
          SELECT LAST_COMPLETE_LOAD_ID
          INTO lv_Last_Load_Id
          FROM LOAD_ADMIN.ETL_PROCESS_FLOW
          WHERE ETL_PROCESS_FLOW_NAME = in_ETL_Process_Flow_Name;
          IF Lv_Last_Load_Id = lv_Current_Load_Id
          THEN
               -- This Process Flow has already been completed during this Load, so do not re-run
               RETURN 2;          -- Returns a Warning Status
          ELSE
               -- This Process Flow has not completed during this load, so need to run this now
               RETURN 1;          -- Returns a Success Status
          END IF;
     END Check_PF_Status;
EXCEPTION
WHEN OTHERS THEN
RETURN 3;     -- Returns an Error Status
RETURN NULL;
END;
In the above code
LATEST_LOAD is a view which always returns one row with current load information (like load _id, start time etc)
ETL_PROCESS_FLOW is a table containing one row for each process flow with information like (execution status, load_id when it was execute )
You can modify to suit your requirements.
HTH,
Mahesh