Setting object attribute in dynamic sql

Question

I am trying to set an object attribute in PL/SQL. It looks like execute immediate is unhappy with
create type test_object as object(username varchar2(200),id number);
declare
obj test_object;
username varchar2(50);
begin
obj := test_object(null,null);
username := 'MIKE';
execute immedaite 'begin :x.username := :y; end;' using obj,username;
end;
Is this supposed to work?

Answer 1

Hi Tony,
Thanks so much for your response. I've had to study up on the dbms_sql package to understand your function... first time I've used it. I've fed my dynamic query to your function and see that it returns a colon delimited list of the column names; however, I think I need a little more schooling on how and where exactly to apply the function to actually set the column names in APEX.
From my test app, here is the code for my dynamic query. I've got it in a "PL/SQL function body returning sql query" region:
DECLARE 
  v_query      VARCHAR2(4000);
  v_as         VARCHAR2(4);
  v_range_from NUMBER;
  v_range_to   NUMBER;         
BEGIN
  v_range_from := :P1_FY_FROM;
  v_range_to   := :P1_FY_TO;
  v_query      := 'SELECT ';
  -- build the dynamic column selections by looping through the fiscal year range.
  -- v_as is meant to specify the column name as (FY10, FY11, etc.), but it's not working.
  FOR i IN v_range_from.. v_range_to  LOOP
    v_as    := 'FY' || SUBSTR(i, 3, 4);
    v_query := v_query || 'MAX(DECODE(FY_NB,' || i || ',PFH_HEADCOUNT,0)) '
      || v_as || ',';
  END LOOP;
  -- add the rest of the query to the dynamic column selection
  v_query := rtrim(v_query,',') || ' FROM ('
    || 'SELECT FY_NB, PFH_HEADCOUNT FROM ('
    || 'SELECT FY_ID, FY_NB FROM FISCAL_YEAR) A '
    || 'LEFT OUTER JOIN ('
    || 'SELECT FY_ID, PFH_HEADCOUNT '
    || 'FROM PROJECT_FY_HEADCOUNT '
    || 'JOIN PROJECT_FY USING (PF_ID) '
    || 'WHERE PL_ID = ' || :P1_PROJECT || ') B '
    || 'ON A.FY_ID = B.FY_ID)';
  RETURN v_query;
END;I need to invoke GET_QUERY_COLS(v_query) somewhere to get the column names, but I'm not sure where I need to call it and how to actually set the column names after getting the returned colon-delimited list.
Can you (or anyone else) please help me get a little further? Once again, feel free to login to my host account to see it first hand.
Thanks again!
Mark