Sql 如何编写基于在另一个表中执行的操作更新表的触发器？

我有一个名为

ORDERITEMS

的表

CREATE TABLE DB2ADMIN.ORDERITEMS (
  ORDERITEMS_ID BIGINT  NOT NULL,
  STOREENT_ID   INTEGER NOT NULL,
  ORDERS_ID BIGINT  NOT NULL,
  TERMCOND_ID   BIGINT,
  TRADING_ID    BIGINT,
  ITEMSPC_ID    BIGINT,
  CATENTRY_ID   BIGINT,
  PARTNUM   VARCHAR(64)
);

我需要创建一个名为

ORDERITEM\u LOG

的新表，该表看起来基本相同，但有两个附加列：

CREATE TABLE DB2ADMIN.ORDERITEM_LOG (
  ORDERITEMS_ID BIGINT  NOT NULL,
  STOREENT_ID   INTEGER NOT NULL,
  ORDERS_ID BIGINT  NOT NULL,
  TERMCOND_ID   BIGINT,
  TRADING_ID    BIGINT,
  ITEMSPC_ID    BIGINT,
  CATENTRY_ID   BIGINT,
  PARTNUM   VARCHAR(64),
  LOG_ACTION_DATE VARCHAR(254),
  LOG_ACTION_TYPE VARCHAR(1)
);

我需要制作一个触发器来监视

ORDERITEMS

表。每当在

ORDERITEMS

表中插入、删除或更新一行时，都需要对

ORDERITEM\U LOG

表执行相同的操作，另外两列填充

当前时间戳

，以及

'U'

、

'D'

或

'I'

（取决于所采取的操作），分别

例如，如果我在

ORDERITEMS

表中插入一行，我希望看到在

ORDERITEM\u LOG

表中插入一个重复的行，时间戳在

LOG\u ACTION\u DATE

中，时间戳在

LOG\u ACTION\u TYPE

中。然后，如果我要删除

ORDERITEMS

中的行，我希望在

ORDERITEM\u LOG

表中看到

'I'

更新为

'D'

，并看到时间戳更新。我希望在

ORDERITEMS

表之前更新

ORDERITEMS\u日志
表

我该如何编写一个触发器来完成我正在寻找的任务？
如果我知道您想要快照对表2的更改。好的策略在数据量大的时候会让你头疼。您需要的sql代码如下所示。您可以使用标签插入、删除、更新为所有作业创建一个触发器，也可以单独创建3个触发器。请注意，SQLUPDATE命令会同时触发delete和insert语句

下面的示例使用BulkInsert，并假设日志表存在。如果一次更新几行，没有问题，但如果同时操作这么多行，可能会超时或响应时间过长。为了避免这种情况，您可能更愿意在WHILE语句中使用where子句编写相同的语句，其目标是主键（如where id=XXX）

    CREATE TRIGGER [ORDERITEMTRIGGER] ON [ORDERITEMS] 
FOR INSERT, UPDATE, DELETE 
AS
-- INSERT
set nocount on
insert into ORDERITEM_LOG(
  ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  LOG_ACTION_DATE,
  LOG_ACTION_TYPE)
select   ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  getdate(),'I' from inserted

-- DELETE (this triggers on delete and update because sql update has 2 phase delete and insert)
insert into ORDERITEM_LOG(
  ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  LOG_ACTION_DATE,
  LOG_ACTION_TYPE)
select   ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  getdate(),'D' from deleted

-- UPDATE
set nocount on
insert into ORDERITEM_LOG(
  ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  LOG_ACTION_DATE,
  LOG_ACTION_TYPE)
select   ORDERITEMS_ID,
  STOREENT_ID,
  ORDERS_ID,
  TERMCOND_ID,
  TRADING_ID,
  ITEMSPC_ID,
  CATENTRY_ID,
  PARTNUM,
  getdate(),'U' from inserted
set nocount off

触发器的类型
触发器有两种类型。在触发器之后和而不是触发器。您必须使用After触发器

1） 后触发器

这些触发器在执行插入、更新或删除等操作后执行

您必须在触发后使用，如下所示

插入后的

CREATE TRIGGER [dbo].[Customer_INSERT]
   ON [dbo].[Customers]
   AFTER INSERT
AS
BEGIN
   SET NOCOUNT ON;
   DECLARE @OrderItemsID;
  DECLARE @StroreentID;
   DECLARE @OrdersID;
   DECLARE @TermCondID;
   DECLARE @TradingID ;
   DECLARE @ItemSPCID;
   DECLARE @CatentryID;
   DECLARE @Partnum;  
   DECLARE @SysDateTime datetime = SYSDATETIME();
   DECLARE @LogActionType VARCHAR(1);

   SELECT @OrderItemsID = INSERTED.ORDERITEMS_ID;
   SELECT @StroreentID = INSERTED.STOREENT_ID;
   SELECT @OrdersID = INSERTED.ORDERS_ID;
   SELECT @TermCondID = INSERTED.TERMCOND_ID;
   SELECT @TradingID = INSERTED.TRADING_ID;
   SELECT @ItemSPCID = INSERTED.ITEMSPC_ID;
   SELECT @CatentryID = INSERTED.CATENTRY_ID;
   SELECT @Partnum = INSERTED.PARTNUM;

   @LogActionType = "1";

   FROM INSERTED

   INSERT INTO ORDERITEM_LOG
   VALUES (@OrderItemsID, @StroreentID, @OrdersID, @TermCondID, @TradingID, @ItemSPCID, @CatentryID, Partnum, LogActionType, @LogActionType)
END

更新后

 CREATE TRIGGER [dbo].[Customer_INSERT]
   ON [dbo].[Customers]
   AFTER UPDATE
AS
BEGIN
   SET NOCOUNT ON;
   DECLARE @OrderItemsID;
  DECLARE @StroreentID;
   DECLARE @OrdersID;
   DECLARE @TermCondID;
   DECLARE @TradingID ;
   DECLARE @ItemSPCID;
   DECLARE @CatentryID;
   DECLARE @Partnum;  
   DECLARE @SysDateTime datetime = SYSDATETIME();
   DECLARE @LogActionType VARCHAR(1);

   SELECT @OrderItemsID = INSERTED.ORDERITEMS_ID;
   SELECT @StroreentID = INSERTED.STOREENT_ID;
   SELECT @OrdersID = INSERTED.ORDERS_ID;
   SELECT @TermCondID = INSERTED.TERMCOND_ID;
   SELECT @TradingID = INSERTED.TRADING_ID;
   SELECT @ItemSPCID = INSERTED.ITEMSPC_ID;
   SELECT @CatentryID = INSERTED.CATENTRY_ID;
   SELECT @Partnum = INSERTED.PARTNUM;

   @LogActionType = "1";

   FROM INSERTED

   INSERT INTO ORDERITEM_LOG
   VALUES(@OrderItemsID, @StroreentID,@OrdersID,@TermCondID,@TradingID,@ItemSPCID,@CatentryID,Partnum,LogActionType, @LogActionType)
END

删除后

 CREATE TRIGGER [dbo].[Customer_INSERT]
   ON [dbo].[Customers]
   AFTER UPDATE
AS
BEGIN
   SET NOCOUNT ON;
   DECLARE @OrderItemsID;
   DECLARE @StroreentID;
   DECLARE @OrdersID;
   DECLARE @TermCondID;
   DECLARE @TradingID ;
   DECLARE @ItemSPCID;
   DECLARE @CatentryID;
   DECLARE @Partnum;  
   DECLARE @SysDateTime datetime = SYSDATETIME();
   DECLARE @LogActionType VARCHAR(1);

   SET @LogActionType = "1";
   SELECT @OrderItemsID = DELETED.ORDERITEMS_ID;
   SELECT @StroreentID = DELETED.STOREENT_ID;
   SELECT @OrdersID = DELETED.ORDERS_ID;
   SELECT @TermCondID = DELETED.TERMCOND_ID;
   SELECT @TradingID = DELETED.TRADING_ID;
   SELECT @ItemSPCID = DELETED.ITEMSPC_ID;
   SELECT @CatentryID = DELETED.CATENTRY_ID;
   SELECT @Partnum = DELETED.PARTNUM;


   INSERT INTO ORDERITEM_LOG
   VALUES(@OrderItemsID, @StroreentID,@OrdersID,@TermCondID,@TradingID,@ItemSPCID,@CatentryID,Partnum,LogActionType, @LogActionType)
END

您看过手册中的触发器示例了吗？你试过写一些代码吗？你有什么特别的困难吗？是的，我试着只为插入编写一些代码，但我不确定该去哪里。在插入每个FOR BEGIN的ORDERITEMS之前创建触发器OI_LOG_触发器？？？在ORDERITEM_LOG（）中插入值（）--不知道最后会发生什么