Question

how to i query the latest information that catched by my trigger before insert and update?

Asked by: dinhchung82

i have a table
I write a " trigger after insert and update this for each row"  for this table .
I don't know condition that to query the row have just inserted in this table that my trigger catched .

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Asked On
2008-06-14 at 04:06:32ID23484888
Tags

PL/SQL

,

Oracle 10 g

Topics

Oracle Database

,

Databases Miscellaneous

Participating Experts
3
Points
200
Comments
9

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Answers

 

by: schwertnerPosted on 2008-06-14 at 05:46:12ID: 21785103

The row has columns. You can acess the columns using this syntax in the trigger:

:new.column_name   ---> this is the replacing value
:old.column_name     ---> this is the replaced value

 

by: jtriftsPosted on 2008-06-14 at 06:53:54ID: 21785395

...just to add to this...

If you have "before insert" trigger, :old.column_name will be null. :new.column_name will be populated with the new, insert value (or Null if passed as null).
Similarly, for "before delete" triggers, :new.column_name will be null.

THe reason I highlight this, is that if you are doing comparisons in your trigger and compare null values, then you, of course, will get null as a result (remember a comparison/evaluation with a null returns null)

 

by: dinhchung82Posted on 2008-06-15 at 01:06:01ID: 21787865

i tried  to use :new.column_name to access the new row but have error with my trigger

Scenerio : i have Doc table , i write a trigger that insert to doc2 which doc is inserted and fired by trigger and write this row to a file ( i shall use my_proc_sms) procedure.

Would you advise me the way to use :new to complie trigger succeefullly!

create or replace trigger sms
after insert
ON doc
FOR EACH ROW
 
DECLARE
 vMsg VARCHAR2(30) := 'Row Level Trigger Fired';
 
BEGIN
  dbms_output.put_line(vMsg);
 
  insert into doc2 select * from doc where :new.id > 0  ;
 
  my_proc_sms();
 
END sms;
                                              
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by: DauheePosted on 2008-06-15 at 05:06:19ID: 21788273

you need to supply DDL for the underlying objects and also specify what the error message you are getting

 

by: schwertnerPosted on 2008-06-16 at 00:18:24ID: 21791334

You select the table doc.
:new.id  has as scope only the inserted value in the row.
Possibly you intended to do:

insert into doc2 select * from doc where :new.id = id  ;
Alternativelly

insert into doc2 (id) values (:new.id)  ;

In the last statement you can add additional columns and values.

 

by: dinhchung82Posted on 2008-06-16 at 00:24:42ID: 21791358

i have this error when run and fire trigger
Original message: ORA-04091: table abc is mutating, trigger/function may not see it

 

by: dinhchung82Posted on 2008-06-16 at 00:34:16ID: 21791405

Hi schwertner ,
After trying insert into doc2 (id) values (:new.id)  ;
i have new error : ORA-01400: cannot insert NULL into ("OWS"."DOC2"."NUMBER_OF_SUB_S")

i know that because we insert only id .
You said that "In the last statement you can add additional columns and values"
I wonder how to add more columns and values

 

by: schwertnerPosted on 2008-06-16 at 00:38:59ID: 21791419

Of course you can.
Mutating table error is caused because you try to SELECT from the table
you just serve with the trigger. This is forbiden and has some workarounds
but I think you can simply insert in the 'history' table what you need
withot querying the original table.

 

by: dinhchung82Posted on 2008-06-18 at 10:41:30ID: 31467175

Thanks so much for your help !

20120131-EE-VQP-002

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