Question

当Items.Status从任何小于20的值更新为20时，需要创建触发器，而不是大于20的值。

触发器应该使用Status.Status_Desc =＆＃34; Packed＆＃34;

更新相应Item_Id的状态表。

到目前为止，我已经能够创建一个类似于下面的触发器，它可以很好地编译，但不会给我预期的结果。请帮忙

create or replace trigger test_trg 
after update on items
referencing old as old new as new
for each row 


--select item_id into
begin
  if (:old.status < 20 and :new.status=20) then
      update status 
      set status_desc='packed'
      where Item_Id =1  /*Justfor testing purpose, this need to be matched with item_id in ITEMS table */
  end if;

end;

创建表格的脚本

  CREATE TABLE "ITEMS" ("ITEM_ID" NUMBER, "ITEM_NAME" VARCHAR2(100), "STATUS" NUMBER)
REM INSERTING into ITEMS
SET DEFINE OFF;
Insert into ITEMS (ITEM_ID,ITEM_NAME,STATUS) values (1,'Test',10);
Insert into ITEMS (ITEM_ID,ITEM_NAME,STATUS) values (2,'Test1',30);



  CREATE TABLE "STATUS" ("ITEM_ID" NUMBER, "STATUS_DESC" VARCHAR2(100))
REM INSERTING into STATUS
SET DEFINE OFF;
Insert into STATUS (ITEM_ID,STATUS_DESC) values (1,'testing');
Insert into STATUS (ITEM_ID,STATUS_DESC) values (2,'testing');

触发根据其他表中的数据更新表

0 个答案: