How to accumlate resultsets in ref cursor

Question

Hello
I have 3 cursor which query on different tables and return the same columns. I need to accumulate the result set of 3 cursors into a single ref cursor. Is this possible. If so how.
regards,
Ravi Narala

Answer 1

It's possible, but it's not recommended. Do you have any control of the situation (can you just write 1 query)?
If you have absolutely no option, you can user record types (you will need a SQL type created), BULK COLLECT the contents of cursor1, cursor2 and cursor3 into that, and then return a REF CURSOR that is
SELECT * FROM TABLE(SQL_TYPE);
Here's an example:
create type my_number_type as table of number;
DECLARE
   c1             sys_refcursor;
   c2             sys_refcursor;
   c3             sys_refcursor;
   final_cursor   sys_refcursor;  
   array_1        my_number_type;
   array_2        my_number_type;
   array_3        my_number_type;
   final_array    my_number_type;     
BEGIN
   open c1 for select 1 from dual;
   fetch c1 bulk collect into array_1;
   close c1;
   open c2 for select 8 from dual;
   fetch c2 bulk collect into array_2;
   close c2;
   open c3 for select 6 from dual;
   fetch c3 bulk collect into array_3;
   close c3;
   select *
   bulk collect into final_array
   from
      select * from table(cast(array_1 as my_number_type))
      UNION ALL
      select * from table(cast(array_2 as my_number_type))
      UNION ALL
      select * from table(cast(array_3 as my_number_type))
   open final_cursor for select * from table(cast(final_array as my_number_type));
END;
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Message was edited by:
        Tubby