Getting the position in SQLLoader using oracle function

Hi. I have a problem to create .ctl file.
i have a oracle function to retrieve position
CREATE OR REPLACE FUNCTION "TEST_KEYFIELDS" (rec_type IN VARCHAR2,fieldName in varchar2)
RETURN VARCHAR2
AS
pos_result VARCHAR2(10) := null;
BEGIN
select '(' || field_start || ':' || (field_start + field_length -1) || ')' into pos_result from test_layout
where record_type=rec_type and field_name=fieldName;
RETURN pos_result;
END TEST_KEYFIELDS;
and this will return
(16:25)
my question is can i use this function and call it in my .ctl. so i don't have to hardcoded the position.
please help me.
TQ

As yourself if you think it will be performant to call a query within a function for every row of data being processed in your loading rather than just hard-coding known values.
You can use functions if you really want, but I would suggest they are used sparingly.

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Getting the position in SQLLoader using oracle function

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