CODEWITHSUNDEEP
triggersdb2
Rakesh Juyal
Rakesh Juyal

Reputation:

In DB2, is it possible to have just a single trigger for both update and insert?

I have to create the trigger(s) which will keep the audit of my table. The trigger is supposed to execute on both insert and update.

currently i am having two triggers

One for Insert:

CREATE TRIGGER SCH.TRG_TBL1_AFT_I
  AFTER INSERT ON SCH.TBL1  
  REFERENCING
    NEW AS n
  FOR EACH ROW
 MODE DB2SQL
INSERT INTO SCH.TBL1_AUDIT
VALUES( .. ,, .. );

Another for update

CREATE TRIGGER SCH.TRG_TBL1_AFT_U
  AFTER UPDATE ON SCH.TBL1  
  REFERENCING
    NEW AS n
  FOR EACH ROW
 MODE DB2SQL
INSERT INTO SCH.TBL1_AUDIT
VALUES( .. ,, .. );

But the point is, if it possible to create a single trigger, in DB2, for doing the task? [ provided both, trigger are doing the same thing .]

Upvotes: 5

Views: 7826

Answers (4)

Nitegreen
Nitegreen

Reputation: 116

Try this, the feature has been available since version 9.7.x.

CREATE or replace TRIGGER PASSENGER_TR01_BEFORE_IUD
 BEFORE 
    DELETE
 OR UPDATE OF FIRST_NAME 
 OR INSERT ON PASSENGER
REFERENCING 
OLD AS oldRow
NEW AS newRow
FOR EACH ROW
WHEN (1=1) 
Begin
Declare ACTION Char(1) Default '';
-- Use Case/When to inquire trigger-event
Case 
When INSERTING Then
    Set ACTION='I';
When UPDATING  Then
    Set ACTION='U';    
When DELETING  Then
    Set ACTION='D';    
Else
    Set ACTION='N';    
End Case;

-- Use If/Then/Else to inquire trigger-event
If INSERTING Then
    Set ACTION='I';
ElseIf UPDATING  Then
    Set ACTION='U';
ElseIf DELETING  Then
    Set ACTION='D';
Else
    Set ACTION='N';    
End If;
End

Upvotes: 4

ShihanH
ShihanH

Reputation: 3

You can find more info here

 CREATE OR REPLACE TRIGGER SET_SALARY
 NO CASCADE
 BEFORE UPDATE OR INSERT ON employee
 REFERENCING NEW AS n OLD AS o
 FOR EACH ROW
 WHEN( o.edlevel IS NULL OR n.edlevel > o.edlevel )
 BEGIN
    -- Give 10% raise to existing employees with new education level.
 IF UPDATING THEN SET n.salary = n.salary * 1.1;
     -- Give starting salary based on education level.
 ELSEIF INSERTING THEN
     SET n.salary = CASE n.edlevel WHEN 18 THEN 50000
  WHEN 16 THEN 40000
         ELSE 25000
  END;
  END IF;
 END

Upvotes: 0

Jess
Jess

Reputation: 25069

Yes it is possible. See the documentation of create trigger. Here is a paste:

trigger-event

   .-OR--------------------------------------.   
   V                                     (4) |   
|----+-INSERT--------------------------+-----+------------------|
     +-DELETE--------------------------+         
     '-UPDATE--+---------------------+-'         
               |     .-,-----------. |           
               |     V             | |           
               '-OF----column-name-+-'

That would enable you to say:

create trigger blah before insert on blah or update of blah.

Upvotes: 2

Fred Sobotka
Fred Sobotka

Reputation: 5332

Sorry, DB2 doesn't offer a way to combine update and insert triggers together.

Upvotes: -1

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