Question

ORA-04091: table is mutating, trigger/function may not see it

Asked by: mrcoolcoder

I am trying to find a simple way to keep two fields the same at all times, but all the samples I come accross are more complex than what works in DB2 (we are migrating to Oracle).

create or replace TRIGGER TRIG_APPLICATION_NEXT_SCH_YR 
AFTER UPDATE OF NEXT_SCH_YR ON APPLICATION
FOR EACH ROW 
WHEN (new.next_sch_yr <> new.stu_grade) 
BEGIN
  UPDATE magnet.application SET stu_grade = :new.next_sch_yr   
  WHERE application_id = :new.application_id;
END;

                                  
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Asked On
2009-06-22 at 15:58:31ID24512945
Tags

Oracle

,

Triggers

,

PL/SQL

,

Mutating Table

Topics

Oracle 11.x Database

,

PL / SQL

,

Oracle Database

Participating Experts
1
Points
500
Comments
8

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Answers

 

by: mrjoltcolaPosted on 2009-06-22 at 16:04:06ID: 24687432

The question is if the new record is the only record that you wish to change, or are you trying to update other records in the APPLICATION table with the same application_id

If you only need to update the record being inserted, prior to insert, you can do a simple BEFORE INSERT or BEFORE UPDATE .. FOR EACH ROW, see below..

However, if you want a a "recursive" style update, you'll need to do it indirectly, you can't update the same table in the trigger.

create or replace TRIGGER TRIG_APPLICATION_NEXT_SCH_YR 
BEFORE UPDATE OF NEXT_SCH_YR ON APPLICATION
FOR EACH ROW 
WHEN (new.next_sch_yr <> new.stu_grade) 
BEGIN
  :new.stu_grade := :new.next_sch_yr;
END;
                                              
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3:
4:
5:
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by: mrjoltcolaPosted on 2009-06-22 at 16:09:25ID: 24687458

If you do want to recursively update the table (say you change 1 record's next_sch_yr and you want to update many rows based on the application_id) then here is a previous sample.

http://www.experts-exchange.com/Q_24448459.html

 

by: mrcoolcoderPosted on 2009-06-22 at 16:15:46ID: 24687498

This is for existing records only.  I will need to keep both fields synchronized regardless of which one is updated.

mrjoltcola, I think you have the right idea.  I should have tried that first.  Except I had to put a ":" before new in the line after BEGIN.

create or replace TRIGGER TRIG_APPLICATION_NEXT_SCH_YR
BEFORE UPDATE OF NEXT_SCH_YR ON APPLICATION
FOR EACH ROW
WHEN (new.next_sch_yr <> new.stu_grade)
BEGIN
  :new.stu_grade := :new.next_sch_yr;
END;

 

by: mrcoolcoderPosted on 2009-06-22 at 16:24:59ID: 31595308

Thanks, I was stuck in DB2 land, and forgot I could directly set the value.

 

by: mrjoltcolaPosted on 2009-06-22 at 16:30:14ID: 24687602

Great! Why a B grade? *sniff*

 

by: mrcoolcoderPosted on 2009-06-22 at 16:33:03ID: 24687619

Well, the solution, simple as it was, didn't compile because it was missing that ":" before the new.  It was very helpful though.

 

by: mrjoltcolaPosted on 2009-06-22 at 16:38:11ID: 24687642

OK, thats what I wanted to know. Sometimes I write them in haste and miss the small things. Thanks.

20120131-EE-VQP-002

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