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Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

Trigger Predicates

When using a single trigger for multiple events, use the trigger predicates INSERTING, UPDATING, and DELETING in the trigger condition to identify the triggering event. The following example illustrates the use of trigger predicates:

CREATE OR REPLACE TRIGGER emp_log_t
   AFTER INSERT OR UPDATE OR DELETE ON emp
   FOR EACH ROW
DECLARE
   dmltype  CHAR(1);
BEGIN
   IF INSERTING THEN
      dmltype := 'I';
      INSERT INTO emp_log (emp_no, who, operation)
         VALUES (:new.empno, USER, dmltype);
   ELSIF UPDATING  THEN
      dmltype := 'U';
      INSERT INTO emp_log (emp_no, who, operation)
         VALUES (:new.empno, USER, dmltype);
   END IF;
END;
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Publisher Resources

ISBN: 0596003366Errata Page