View based on PL/SQL table?

Question

I'd like to create a view based on a PL/SQL memory table (records of %rowtype). Has anyone done this? The idea is, based on the where clause (or lack of one), the view definition containts call to a stored procedure that builds the rows to be returned. Ideas?
Tom-

Answer 1

Pipelined function - based example:
SQL> create or replace package my_pkg
  2  is
  3   type nested_tab_type is table of emp%rowtype;
  4   nt_instance nested_tab_type := nested_tab_type();
  5   function get_nt_instance return nested_tab_type pipelined;
  6  end;
  7  /
Package created.
SQL> create or replace package body my_pkg
  2  is
  3   function get_nt_instance return nested_tab_type pipelined
  4   is
  5   begin
  6    for j in 1..nt_instance.count loop
  7     pipe row(nt_instance(j));
  8    end loop;
  9    return;
10   end;
11  end;
12  /
Package body created.
SQL> create or replace view nt_view as
  2  select ename,sal from table(my_pkg.get_nt_instance)
  3  /
View created.
SQL> begin
  2   select * bulk collect into my_pkg.nt_instance
  3   from emp
  4   where deptno = 10;
  5  end;
  6  /
PL/SQL procedure successfully completed.
SQL> select * from nt_view;
ENAME             SAL
CLARK            2450
KING             5000
MILLER           1300
SQL> begin
  2   my_pkg.nt_instance.delete;
  3   select * bulk collect into my_pkg.nt_instance
  4   from emp
  5   where deptno = 20;
  6  end;
  7  /
PL/SQL procedure successfully completed.
SQL> select * from nt_view;
ENAME             SAL
SMITH            1000
JONES            2975
SCOTT            3000
ADAMS            1100
FORD             3000Object -based example:
SQL> create or replace type emp_obj is object (ename varchar2(10), sal number(7,2));
  2  /
Type created.
SQL> create or replace type emp_obj_t is table of emp_obj;
  2  /
Type created.
SQL> create or replace package my_pkg
  2  is
  3   emp_t_instance emp_obj_t := emp_obj_t();
  4   function get_emp_t_instance return emp_obj_t;
  5  end;
  6  /
Package created.
SQL> create or replace package body my_pkg
  2  is
  3   function get_emp_t_instance return emp_obj_t
  4   is
  5   begin
  6    return emp_t_instance;
  7   end;
  8  end;
  9  /
Package body created.
SQL> create or replace view nt_view as
  2  select ename,sal from table(my_pkg.get_emp_t_instance)
  3  /
View created.
SQL> begin
  2   select emp_obj(ename,sal) bulk collect into my_pkg.emp_t_instance
  3   from emp
  4   where deptno = 10;
  5  end;
  6  /
PL/SQL procedure successfully completed.
SQL> select * from nt_view;
ENAME             SAL
CLARK            2450
KING             5000
MILLER           1300
SQL> begin
  2   my_pkg.emp_t_instance.delete;
  3   select emp_obj(ename,sal) bulk collect into my_pkg.emp_t_instance
  4   from emp
  5   where deptno = 20;
  6  end;
  7  /
PL/SQL procedure successfully completed.
SQL> select * from nt_view;
ENAME             SAL
SMITH            1000
JONES            2975
SCOTT            3000
ADAMS            1100
FORD             3000Rgds.