Question

我想从一个表到另一个表获取数据，给定以下参数..

所以我有4张桌子，他们是

M_InternalRequester, M_InternalRequesterLine, M_Inventory, M_InventoryLine

M_InternalRequester

-----------------------
m_internalrequester_id 
-----------------------
1001

M_InternalRequesterLine

------------------------------------------------------------------------------
m_internalrequesterline_id || m_internalrequester_id || m_product_id || qty || 
------------------------------------------------------------------------------
3001                       || 1001                   || 21001        ||  3  ||
3002                       || 1001                   || 21002        ||  4  ||

M_Inventory

----------------------------------------------------------------------
m_inventory_id || description             || m_internalrequester_id ||
----------------------------------------------------------------------
8001           || Referred from Internal  ||  1001                  ||

M_InventoryLine

--------------------------------------------------------------
m_inventoryline_id || m_inventory_id || m_product_id || qty || 
--------------------------------------------------------------
???????????        ||  8001          ||  ??????????? || ??  ||
???????????        ||  8001          ||  ??????????? || ??  ||

我的数据以前记录在M_Internal Requester和M_InternalRequesterLine

中

我想根据表M_InternalRequesterLine中提供的参数M_InventoryLine将数据从m_internalrequester_id提取到M_Inventory

我已经像这样做了一个触发器

create or replace trigger TG_AI_M_INVENTORYSN
before update on m_inventory
for each row
declare
  internalrequester_id number;
  invline_id number;

CURSOR c1 is
select
    M_PRODUCT_ID, QTY
from m_internalrequesterline
where m_internalrequester_id=:new.m_internalrequester_id;

BEGIN

if inserting then 
SELECT M_INTERNALREQUESTER_ID INTO INTERNALREQUESTER_ID FROM M_INTERNALREQUESTER WHERE
m_internalrequester_ID = :new.m_internalrequester_id;

FOR insertline in C1
LOOP
select currentnext into invline_id from AD_Sequence WHERE
name = 'M_Inventoryline';

INSERT INTO M_INVENTORYLINE 

(m_inventoryline_id, m_product_id, qty
)
VALUES 
(invline_id, insertline.m_product_id, insertline.qty);


update AD_Sequence set currentnext=invline_id+1 where name = 'M_Inventoryline';
END LOOP;
END IF;


end;

它已经创建但是当我执行它时，它不会工作。有什么问题，如何解决？

Answer 1

根据此声明，这是BEFORE UPDATE触发器：

create or replace trigger TG_AI_M_INVENTORYSN
before update on m_inventory

所以只在更新语句之前触发了触发器。

IF语句使用INSERTING谓词来检查在INSERT语句之后或之前是否触发了触发器。

if inserting then ....

因为触发器仅在UPDATE之前触发，所以INSERTING谓词始终为false，并且永远不会执行THEN和END IF之间的代码。

使用参数从一个表获取数据到另一个表

1 个答案: