Apex Data Load : 2 number columns from csv file select 1 based on the condition and load into table - oracle-apex

Question

I have a issue in Oracle Apex Data Load which I will try to explain in a simple way:
I want to copy csv data (copy/paste) in Data Load Application and apply the transformation, and rules and load the data into the table BIKE.
csv columns (type, amount-a, amount-b)
blue, 10, 100
green, 20, 200
table BIKE columns
(type, amount)
I want to create a transformation to check if the column value in the table BIKE is 'blue' then load amount-b other wise amount-a.
Can anyone help me on this?
Thanks

Answer 1

Create a staging table, e.g. like this (you will need to adjust the details of the columns to match your data model):
create table bike_staging
(
apex_session number not null,
bike_id number not null,
bike_type varchar2(100) not null,
amount_a number,
amount_b number
);
Add a trigger to populate session_id:
create or replace trigger bi_bike_staging
before insert on bike_staging for each row
begin
:new.apex_session := v('APP_SESSION');
end bi_bike_staging;
Add two processes to the third page of the data load wizard, on either side of the "Prepare Uploaded Data" process, like this:
The code for "delete staging table" will be like this:
delete bike_staging where apex_session = :APP_SESSION;
The code for "load bikes" may be something like this:
merge into bikes t
using (select bike_id,
bike_type,
case bike_type
when 'BLUE' then amount_b
else amount_a
end as amount
from bike_staging
where apex_session = :APP_SESSION
) s
on (t.bike_id = s.bike_id)
when matched then update set
t.bike_type = s.bike_type,
t.amount = s.amount
when not matched then insert (bike_id, bike_type, amount)
values (s.bike_id, s.bike_type, s.amount);
delete bike_staging where apex_session = :APP_SESSION;
Alternatively, if you are only inserting new records you don't need the merge, you can use a simple insert statement.