Select query on REF CURSOR

Question

Hi all,
I am trying see if we can use LINQ like functionality to query a ref cursor resultset. I have about 50 procedures( as part of 12 packages) which send the ref cursor output to a front end application when called individually. Now I need to create a procedure to get only specified records from each of these 50 ref cursors and output it to another ref curosr.
In other words how can I use the following
select col_2 from pkg_abc.pro_ref_cursor_out(arg1, arg2...) where col_1 = 'X':I am not inclined to use a fetch as I foresee performance issues?
Thanks

Answer 1

@ Tubby. Here is what I am looking to do. Let us say I have two packages as below each with one ref cursor. In reality there are about 15 packages and 50 procedures and hence 50 ref cursors.
CREATE OR REPLACE PACKAGE pkg_1
IS
   TYPE resultset_typ IS REF CURSOR;
   PROCEDURE pro_1 (
      i_region          IN       VARCHAR2,
      o_resultset      OUT      resultset_typ,          -- 'recordset' output
END pkg_1;
CREATE OR REPLACE PACKAGE BODY pkg_1
IS
   PROCEDURE pro_1 (
      i_region          IN       VARCHAR2,
      o_resultset      OUT      resultset_typ,         
   IS
    BEGIN
       OPEN o_resultset FOR
             SELECT 'employees' AS person_type, employee_name FROM tbl_employees WHERE region = i_region;   
    END;
   END pro_1;
END pkg_1;
CREATE OR REPLACE PACKAGE pkg_2
IS
   TYPE resultset_typ IS REF CURSOR;
   PROCEDURE pro_2 (
      i_region          IN       VARCHAR2,
      o_resultset      OUT      resultset_typ,          -- 'recordset' output
END pkg_2;
CREATE OR REPLACE PACKAGE BODY pkg_2
IS
   PROCEDURE pro_2 (
      i_region          IN       VARCHAR2,
      o_resultset      OUT      resultset_typ,         
   IS
    BEGIN
       OPEN o_resultset FOR
             SELECT 'customers' AS person_type, customer_name FROM tbl_customers WHERE region = i_region;
    END;
   END pro_2;
END pkg_2;Currenlty the front end app calls these packages individually when required. But I want to create an additional package as follows so that I dont have to write the underlying queries again.
CREATE OR REPLACE PACKAGE pkg_3
IS
   TYPE resultset_typ IS REF CURSOR;
   PROCEDURE pro_3 (
      i_region          IN       VARCHAR2,
      i_name           IN       VARCHAR2,
      o_resultset      OUT      resultset_typ,          -- 'recordset' output
END pkg_3;
CREATE OR REPLACE PACKAGE BODY pkg_3
IS
   PROCEDURE pro_3 (
      i_region          IN       VARCHAR2,
      i_name           IN       VARCHAR2,
      o_resultset     OUT      resultset_typ,         
   IS
    BEGIN
       OPEN o_resultset FOR
             SELECT * FROM pkg_1.pro_1(i_region) WHERE employee_name = i_name
             UNION ALL
             SELECT * FROM pkg_2.pro_2(i_region) WHERE customer_name = i_name
    END;
   END pro_3;
END pkg_3;