What's your version of Oracle? I usually have a stock answer on how to
solve this type of problem, but I just tried out your problem on my little
Personal Oracle here, and to my INCREDIBLE surprise, the trigger worked and
I didn't get an error. Does anyone know if that's just because I'm using
Personal Oracle, or did they actually manage to guarantee consistency when
the tables are mutating in 8.1.6? This is the trigger text I used:
create or replace trigger bir_tableB
before insert on tableB
for each row
declare
cursor get_max_date is
select max(create_date)
from tableB;
maxDate date;
begin
open get_max_date;
fetch get_max_date into maxDate;
close get_max_date;
if (:new.create_date < nvl(maxDate, :new.create_date)) then
raise_application_error(-20101, 'New date must be greater
than any existing record.');
end if;
end bir_tableB;
Diana Duncan
TITAN Technology Partners
One Copley Parkway, Ste 540
Morrisville, NC 27560
VM: 919.466.7337 x 316
F: 919.466.7427
E: [EMAIL PROTECTED]
Leslie Lu
<leslie_y_lu@ To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
yahoo.com> cc:
Sent by: Fax to:
root@fatcity. Subject: in addition -- ORA-04091: table
mutating problem?
com
05/03/2001
07:11 PM
Please
respond to
ORACLE-L
In addition to my previous question:
supposed you cannot use Max(date), and MUST use the
cursor. (may be my example is not a good one),
anyway, I'd like to know how to get around this
mutating problem. Thank you!
--- Leslie Lu <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> I got ORA-04091: table mutating problem. Here is
> the
> case: select from table A and insert them into table
> B. A trigger is used to check that new DATE must be
> later than every DATE in B. So I open an cursor,
> loop
> through cursor to compare new DATE value.
>
> If I tested using hard coded value, the trigger
> works;
> if do a insert ... select, I got ORA-04091.
>
> I looked through metalink, didn't see anything that
> can help.
>
> Thank you in advance.
>
> Leslie
>
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