Invalid cursor within the service in pipeline

The simple example following illustrates a mistake that I am experiencing with development code more complex.

I try to reuse a complex procedure that I do not have duplication of code and business logic.

It runs correctly.

exec PKG_TEST.complex_proc(:p_cursor);

This property returns an error:

exec PKG_TEST.select_rows(:p_cursor);

The error is ORA-01001: Invalid cursor.

I checked and the cursor is opened and % notfound is false.

Any ideas?

Thank you in advance for your help!

create the table employees

(

primary key ID number,

name varchar2 (100)

);

insert into employee values (1, 'Joe');

insert into employee values (2, 'Bob');

insert into employee values (3, 'Peter');

create table contractor

(

primary key ID number,

name varchar2 (100)

);

insert into a values (4, 'Henry') contractor;

insert into contractor values (5, 'William');

create or replace package PKG_TEST

type t_rec is rendered

(

Identification number,

name varchar (100)

);

type t_tab is table of the t_rec;

procedure complex_proc (p_cursor to sys_refcursor);

function select_fn (p_cursor sys_refcursor)

return PKG_TEST.t_tab in pipeline;

select_rows (p_cursor to sys_refcursor) procedure;

end pkg_test;

create or replace package PKG_TEST body

procedure complex_proc (out p_cursor sys_refcursor)

Start

Open the p_cursor for

Select *.

the employee;

end complex_proc;

function select_fn (p_cursor sys_refcursor)

return PKG_TEST.t_tab pipeline

v_tab PKG_TEST.t_tab;

v_rec PKG_TEST.t_rec;

Start

loop

collect the fetch p_cursor in bulk in the v_tab limit 100;

because me in 1... v_tab. Count

loop

v_rec: = v_tab (i);

pipe row (v_rec);

end loop;

When the output p_cursor % NOTFOUND;

end loop;

return;

end select_fn;

select_rows (exit p_cursor sys_refcursor) procedure

v_cursor sys_refcursor;

Start

PKG_TEST.complex_proc (v_cursor);

Open the p_cursor for

Select *.

table (PKG_TEST.select_fn (v_cursor))

Union of all the

Select *.

contractor;

select_rows end;

end pkg_test;

Problem is that your variable v_cursor in SELECT_ROWS is out of scope when the procedure ends.

So the ref cursor returned by this method cannot be referenced it more.

If you are on 11g and beyond, a workaround is to declare v_cursor DBMS_SQL cursor (for example an INTEGER data type) and use DBMS_SQL.to_cursor_number / DBMS_SQL.to_refcursor to convert between the two.

In this way, the query pointed to by the final Ref cursor will always have a valid binding variable when the procedure ends.

function select_fn( p_cursor in integer )
return PKG_TEST.t_tab pipelined
is

  v_tab         PKG_TEST.t_tab;
  v_rec         PKG_TEST.t_rec;
  v_cursor_num  integer := p_cursor;
  v_cursor      sys_refcursor := dbms_sql.to_refcursor(v_cursor_num);

begin

  loop

    fetch v_cursor bulk collect into v_tab limit 100;

    --exit when p_cursor%NOTFOUND;
    exit when v_tab.count = 0;

     for i in 1 .. v_tab.count
     loop
        v_rec := v_tab(i);
        pipe row(v_rec);
     end loop;

  end loop;

  close v_cursor;

  return;

end select_fn;

procedure select_rows ( p_cursor out sys_refcursor )
is
   v_cursor  sys_refcursor;
   v_cursor2 integer;
begin
   PKG_TEST.complex_proc(v_cursor);

   v_cursor2 := dbms_sql.to_cursor_number(v_cursor);

   open p_cursor for
   select *
   from TABLE(PKG_TEST.select_fn(v_cursor2))
   union all
   select *
   from contractor;

end select_rows;

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