How to pass column header as a parameter in Validation Expression (APEX4.0)

Question

Hello
I created a new Page validation in APEX4.0 ( not 4.1 ).
(1) Type : Function Returning error text
(2) Validation Expression 1 :
begin
return validate_name ( p_c=> #COLUMN_HEADER# ,p_c_value=> to_date(:p26_LEAVE_FROM,'dd/mm/yyyy') );
end;
note: the validate_name is an oracle pl/sql procedure which takes two input parameters ( column header name and actual value ) and return a specific error message ( to that column ) or NULL.
(3) In the Error Message section, I left Error Message blank ( as the app ignored the mssage but used the one returned from the above function)
However, I chose "The Error display location" to be inline with field and notification" and Associated Item to be "p26_LEAVE_FROM".
My question, it worked if I hard coded the actual column header "LEAVE FROM" , but it didn't work if I used the above #COLUMN_HEADER# in Validation Expression. Can I avoid hard coding as the column header might be changed one day. Is there a better way to deal with multiple column validations with different error message for each column ? It seems that I will have to create similar page valiation for each column to be validated.
Thanks for your advice.
Edited by: Susanna on 19/01/2012 17:45

Answer 1

You want something like this:
DECLARE
  lio_success  VARCHAR2( 2000 );
  li_id        NUMBER;
  li_dep_id    NUMBER;
  li_sel_id := NUMBER;
  li_date DATE;
  lo_date DATE;
  lio_return_message xyz_bpe_rec_fn.xyz_bpe_rec_col;
  l_ret xyz;
BEGIN
  lio_success := 'some value';
  li_id := NULL;     -- or some number
  li_dep_id := NULL; -- or some number
  li_sel_id := NULL; -- or some number
  li_date DATE := sysdate;
  lio_return_message.col1 := somevalue;
  lio_return_message.col2 := somevalue;
  lio_return_message.coln := somevalue;
  l_ret := get_xyz( lio_success
                  , li_id
                  , li_dep_id
                  , li_sel_id
                  , li_date
                  , lo_date
                  , lio_return_message );
END;
/