几个触发器的实例

CREATE OR REPLACE TRIGGER "TRI_DEPARTMENT_BEFORE_INSERT" BEFORE
       INSERT ON TBL_DEPARTMENT FOR EACH ROW
 
BEGIN
       SELECT SEQ_DEPARTMENT.NEXTVAL INTO :NEW.DEPARTMENT_ID FROM DUAL;
       SELECT :new.department_id INTO :new.department_code FROM dual ;
 END;
/

　　

CREATE OR REPLACE TRIGGER "TRI_PERSON_BEFORE_INSERT" before
  INSERT ON tbl_person FOR EACH ROW

DECLARE
    person_count number ;
BEGIN
  SELECT seq_person.nextval INTO :new.person_id FROM dual ;
  SELECT max(person_sort)+1 INTO :NEW.person_sort FROM tbl_person WHERE department_id = :NEW.department_id;
  IF :NEW.person_sort IS NULL THEN
    :NEW.person_sort := 1 ;
  END IF ;
END;
/

　　

CREATE OR REPLACE TRIGGER "TRI_REGIONS_BEFORE_INSERT" BEFORE
       INSERT ON TBL_REGIONS FOR EACH ROW
 
BEGIN
       SELECT SEQ_REGIONS.NEXTVAL INTO :NEW.REGIONS_ID FROM DUAL;
 END;
/

　　

CREATE OR REPLACE TRIGGER "TRI_UNIT_BEFORE_INSERT" BEFORE
       INSERT ON TBL_UNIT FOR EACH ROW
 
BEGIN
       SELECT SEQ_UNIT.NEXTVAL INTO :NEW.UNIT_ID FROM DUAL;
 END;
/