A large number of cursors , one pipelined function

Question

I have code like this:

CREATE OR REPLACE TYPE person_typ AS OBJECT (ssn NUMBER(9), 
name VARCHAR2(30), address VARCHAR2(100));

CREATE OR REPLACE TYPE t_tab AS TABLE OF person_typ;

CREATE OR REPLACE FUNCTION my_pipe(p_in VARCHAR2) RETURN t_tab PIPELINED IS
     rec person_typ;

     CURSOR cur1 IS
          SELECT ssn, name, address FROM /* ... complex query */

     CURSOR cur2 IS
          SELECT ssn, name, address FROM /* ... complex query */

     CURSOR cur3 IS
          SELECT ssn, name, address FROM /* ... complex query */

     CURSOR cur4 IS
          SELECT ssn, name, address FROM /* ... complex query */

     CURSOR cur5 IS
          SELECT ssn, name, address FROM /* ... complex query */
BEGIN
    FOR cur IN cur1 LOOP
        rec := r_inc(cur.ssn, cur.name, cur.address);
        PIPE ROW(rec);
    END LOOP; 

    FOR cur IN cur2 LOOP
        rec := r_inc(cur.ssn, cur.name, cur.address);
        PIPE ROW(rec);
    END LOOP; 

    FOR cur IN cur3 LOOP
        rec := r_inc(cur.ssn, cur.name, cur.address);
        PIPE ROW(rec);
    END LOOP; 

    FOR cur IN cur4 LOOP
        rec := r_inc(cur.ssn, cur.name, cur.address);
        PIPE ROW(rec);
    END LOOP; 

    FOR cur IN cur5 LOOP
        rec := r_inc(cur.ssn, cur.name, cur.address);
        PIPE ROW(rec);
    END LOOP; 
END;

My problem is that my pipelined function is oogly - I have to have five cursors (this is independent of me), but I dont want to have five for loops. I would prefer have only one loop and one PIPE ROW(rec) statement ... is any way to concatenate result into one collection and then iter them?

Answer 1

Hmmm, how about using union all and only one cursor?

 CURSOR cur1 IS
      SELECT ssn, name, address FROM /* ... complex query */
      UNION ALL
      SELECT ssn, name, address FROM /* ... complex query */
      UNION ALL
      SELECT ssn, name, address FROM /* ... complex query */
      UNION ALL
      SELECT ssn, name, address FROM /* ... complex query */
      UNION ALL
      SELECT ssn, name, address FROM /* ... complex query */