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如何在 MS SQL 2008 中使用触发器更新单个表

发布于 2024-08-31 13:19:46 字数 420 浏览 2 评论 0原文

我有一个表PeroidicDeduction，字段是ID（自动递增），TotalDeduction（egit可以贷款），Paid（每个月的扣除额），RemainingAmount，

我想要的是每次插入或更新表时---RemainingAmount 将获取 TotalDeduction-SUM(Paid) 的值...并写入以下触发器...但对我不起作用

CREATE TRIGGER dbo.UpdatePD ON 定期扣除插入后，更新

开始

扣除

更新周期性 SET REmaininAmoubnt=(SELECT TotalDeduction-(SELECT SUM(Paid) FROM PeroidicDeduction) FROM PeroidicDeduction)

END

注意：它位于单个表上

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幻梦 2024-09-07 13:19:46

创建两个触发器，一个 INSTEAD OF UPDATE 和 INSTEAD OF INSERT。以下是 INSTEAD OF UPDATE 的代码：

CREATE TRIGGER dbo.UpdatePD ON PeroidicDedcution 
INSTEAD OF Update
AS
SET NOCOUNT ON

UPDATE p
    SET col1=i.col1
       ,col2=i.col2
    FROM INSERTED  i
        INNER JOIN PeroidicDedcution p ON i.PK=p.PK

UPDATE PeroidicDedcution 
    SET REmaininAmoubnt=(SELECT TotalDeduction-(SELECT SUM(Paid) FROM PeroidicDeduction) FROM PeroidicDeduction)
go

它将执行触发触发器的原始更新，以及问题中触发器的 SUM 逻辑。

这是 INSTEAD OF INSERT 触发器：

CREATE TRIGGER dbo.InsertPD ON PeroidicDedcution 
INSTEAD OF INSERT
AS
SET NOCOUNT ON

INSERT INTO PeroidicDedcution
    (col1, col2, ...)
    SELECT
       col1, col2, ...
    FROM INSERTED

UPDATE PeroidicDedcution 
    SET REmaininAmoubnt=(SELECT TotalDeduction-(SELECT SUM(Paid) FROM PeroidicDeduction) FROM PeroidicDeduction)
go

Create two triggers, an INSTEAD OF UPDATE and INSTEAD OF INSERT. Here is the code for the INSTEAD OF UPDATE:

CREATE TRIGGER dbo.UpdatePD ON PeroidicDedcution 
INSTEAD OF Update
AS
SET NOCOUNT ON

UPDATE p
    SET col1=i.col1
       ,col2=i.col2
    FROM INSERTED  i
        INNER JOIN PeroidicDedcution p ON i.PK=p.PK

UPDATE PeroidicDedcution 
    SET REmaininAmoubnt=(SELECT TotalDeduction-(SELECT SUM(Paid) FROM PeroidicDeduction) FROM PeroidicDeduction)
go

It will do both the original update that fires the trigger, as well as the SUM logic from the trigger in the question.

here is the INSTEAD OF INSERT trigger:

CREATE TRIGGER dbo.InsertPD ON PeroidicDedcution 
INSTEAD OF INSERT
AS
SET NOCOUNT ON

INSERT INTO PeroidicDedcution
    (col1, col2, ...)
    SELECT
       col1, col2, ...
    FROM INSERTED

UPDATE PeroidicDedcution 
    SET REmaininAmoubnt=(SELECT TotalDeduction-(SELECT SUM(Paid) FROM PeroidicDeduction) FROM PeroidicDeduction)
go

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