插入前后的Oracle触发器

Question

是否可以在 Oracle 中只创建一个在数据插入表之前和之后触发的触发器？

begin

if inserting THEN
   -- This code should be run before insertion:
   :new.cr_timestamp := SYSTIMESTAMP;

   IF :NEW.id IS NULL THEN
      SELECT sq_table_id.NEXTVAL
      INTO :NEW.id
      FROM dual;
   END IF;

-- Now I want code which run after the insertion..

end if;

end;

那么是否有一个标志表明它是在插入之前还是之后？

Answer 1

可以写成下面这样。

CREATE OR REPLACE TRIGGER compound_trigger_name
FOR [INSERT|DELETE|UPDATE [OF column] ON table
COMPOUND TRIGGER

--Executed before DML statement
     BEFORE STATEMENT IS
     BEGIN
       NULL;
     END BEFORE STATEMENT;

   --Executed aftereach row change- :NEW, :OLD are available
     AFTER EACH ROW IS
     BEGIN
       NULL;
     END AFTER EACH ROW;

     --Executed after DML statement
     AFTER STATEMENT IS
     BEGIN
       NULL;
     END AFTER STATEMENT;

END compound_trigger_name;