SQL Server 更新移动到单独的列

Posted 2023-05-08

【中文标题】SQL Server 更新移动到单独的列

【英文标题】：SQL Server on update move to separate column

【发布时间】：2015-04-22 18:11:37

【问题描述】：

我的公司需要Customer 表中的一列，该列将显示任何客户以前的地址数。每当地址更新时，此号码必须自动更新。

 CREATE TRIGGER deleted_address ON tblcustomer
 INSTEAD OF INSERT
 AS
 BEGIN
 SET NOCOUNT ON

 end

到目前为止，我有这个，但我遇到了一个问题，我不知道如何制作它，所以如果编辑客户的地址，它会将旧地址添加到名为 PreviousAddress 的新列中，然后更新CustomerAddress

【参考方案1】：

使用AFTER UPDATE 触发器：

CREATE TRIGGER deleted_address ON tblcustomer
AFTER UPDATE
AS
BEGIN
   SET NOCOUNT ON


   IF UPDATE (Address)
      UPDATE t SET countPrev = countPrev + 1, oldAddress = d.Address
      FROM tblcustomer t
      JOIN INSERTED i ON t.customer_id = i.customer_id
      JOIN DELETED d  ON t.customer_id = d.customer_id

END

【参考方案2】：

要更新以前的地址，你可以这样写一个触发器。

CREATE TRIGGER trg_UpdateAddress
   ON  Customer
   AFTER UPDATE
AS 
BEGIN
    DECLARE @id INT = (SELECT ID FROM DELETED)
    UPDATE dbo.Customer SET PreviousAddress = (SELECT Address FROM DELETED )
    WHERE ID = @id
END

【参考方案3】：

试试看这是否适合你：

CREATE TRIGGER deleted_address ON tblcustomer
AFTER UPDATE
AS
BEGIN
    IF UPDATE (CustomerAddress)
    UPDATE t
    SET t.[PreviousAddress] = t.PreviousAddress + 1,
        t.CustomerAddress = i.CustomerAddress
    FROM tblcustomer t
    JOIN INSERTED i ON t.customer_id = i.customer_id
END
GO

【讨论】：

那么，除非CustomerAddress 列受到影响，否则我的更新将被忽略？

好点，我更新到更新后...我一定错过了之前的那个。感谢收看！