How to Solve Mutating Trigger Using Compound trigger

 

How to Solve Mutating Trigger Using Compound trigger

Mutating ERROR CODE:-

CREATE OR REPLACE TRIGGER APPS.XX_EMP_B_U_TRIG 

BEFORE 

UPDATE 

--OF SAL 

ON APPS.XX_EMP

--REFERENCING OLD AS OLD NEW AS NEW

FOR EACH ROW

DECLARE

V_PRESIDENT_SAL NUMBER;

 

BEGIN    

dbms_output.put_line ('============ Row Level  - Before Update Trigger Fired ============');

 

select SAL INTO V_PRESIDENT_SAL  from xx_emp where JOB= 'PRESIDENT';

 

 

    IF :NEW.SAL >= V_PRESIDENT_SAL  THEN

 

    dbms_output.put_line ('*****  You can not assign this salary to anyone  *****');

    RAISE_APPLICATION_ERROR(-20100,'You can not assign this salary to anyone');

 

    ELSE

    dbms_output.put_line ('***** You Can assign this Salary  *****');

    END IF;

  

   

END;

 

 

---===========================----

 

Solution

Compound Trigger Code:-

 

CREATE OR REPLACE TRIGGER  XX_COMP_EMP_MUT_TRIG

FOR  INSERT OR DELETE OR UPDATE

OF SAL

ON XX_EMP

COMPOUND TRIGGER

 

   -- Declarative Section (optional) for variables and constants

V_PRESIDENT_SAL NUMBER;       

     --Section 1 -- sequence 1 -

     BEFORE STATEMENT IS

     BEGIN

     dbms_output.put_line ('************   Compound Statement Level - BEFORE Trigger *************' );

         IF INSERTING THEN

         dbms_output.put_line ('INSERT');

         ELSIF UPDATING THEN

         dbms_output.put_line ('UPDATE');

 

         select SAL INTO V_PRESIDENT_SAL  from xx_emp where JOB= 'PRESIDENT';

           

         dbms_output.put_line ('PRESIDENT Salary Fetched from System : '||V_PRESIDENT_SAL);

            

         ELSIF DELETING THEN

         dbms_output.put_line ('DELETE');

         END IF;      

     END BEFORE STATEMENT;

  

     --Section 2 -- sequence 2 -

     BEFORE EACH ROW IS

     BEGIN

       dbms_output.put_line ('************   Compound Row Level - BEFORE Trigger *************' );

       IF INSERTING THEN

         dbms_output.put_line ('INSERT');

         ELSIF UPDATING THEN

         dbms_output.put_line ('UPDATE');

        

             IF :NEW.SAL >= V_PRESIDENT_SAL  THEN

 

                dbms_output.put_line ('*****  You can not assign this salary to anyone  *****');

                RAISE_APPLICATION_ERROR(-20100,'You can not assign this salary to anyone');

 

                ELSE

                dbms_output.put_line ('***** You Can assign this Salary  *****');

             END IF;

              

        

         ELSIF DELETING THEN

         dbms_output.put_line ('DELETE');

         END IF;   

     END BEFORE EACH ROW;

  

     --Section 3 -- sequence 3 -

     AFTER EACH ROW IS

     BEGIN

       dbms_output.put_line ('************  Compound Row Level - AFTER Trigger *************' );

       IF INSERTING THEN

         dbms_output.put_line ('INSERT');

         ELSIF UPDATING THEN

         dbms_output.put_line ('UPDATE');

         ELSIF DELETING THEN

         dbms_output.put_line ('DELETE');

         END IF;   

     END AFTER EACH ROW;

  

     --Section 4 -- sequence 4 -

     AFTER STATEMENT IS

     BEGIN

       dbms_output.put_line ('************ Compound  Statement Level - AFTER Trigger *************' );

       IF INSERTING THEN

         dbms_output.put_line ('INSERT');

         ELSIF UPDATING THEN

         dbms_output.put_line ('UPDATE');

         ELSIF DELETING THEN

         dbms_output.put_line ('DELETE');

         END IF;   

     END AFTER STATEMENT;

 

END;

 

 

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