The AskTOM team is taking a break over the holiday season, so we're not taking questions or responding to comments, but we might still sneak in a few Office Hours sessions! Thanks for being a member of the AskTOM community.

Thanks for the question, Joel.

Asked: September 03, 2024 - 5:52 pm UTC

Last updated: September 04, 2024 - 2:28 am UTC

Version: 19c.22

Viewed 100+ times

You Asked

Hi,

thank you for taking my question,

I wanted to know the logic behind not being able to reference :new and :old variables in dynamic sql

execute immediate 'insert into tablea (columna, columnb) values (:old.columna,:new.columnb)';

this will fail

just trying to understand the logic behind it.

thank you for you response

PS constant browser on on your site loven it!

and Connor said...

Its one of those things, it "just is" :-)

new and old values are akin to bind variables, so just like you cannot do:

execute immediate 'delete from emp where empno = p_my_plsql_variable';

you can't do the same with new/old.

You can treat them like binds hence

execute immediate 'delete from emp where empno = :b1' using :new.empno;

SQL> create table t ( x int );

Table created.

SQL> create or replace
  2  trigger trg
  3  before insert on t
  4  for each row
  5  declare
  6    v int;
  7  begin
  8    execute immediate 'select count(*) from emp where empno = :b1' using :new.x;
  9  end;
 10  /

Trigger created.

We're not taking comments currently, so please try again later if you want to add a comment.

Breadcrumb

Question and Answer

You Asked

and Connor said...

More to Explore

PL/SQL demos

PL/SQL docs

Dynamic Sql

Breadcrumb

Question and Answer

You Asked

and Connor said...

More to Explore

PL/SQL demos

PL/SQL docs