Question

我有大约25个表，每个表都有3个触发器（插入，更新，删除）来生成用户操作的日志。每次在UI中进行编辑时，所有这些表都会更新，尽管它们的值在UI中没有更改。

在这种情况下，我无法检查列是否更新，我需要检查以前更新的值是否与新更新的值不同，然后我可以插入到我的日志表中。此外，我需要将所有更新的表值作为以逗号分隔的字符串插入日志表。

有没有有效的方法来处理这个问题？

ALTER TRIGGER [dbo].[Activity_Update]
ON [dbo].[Activity]
AFTER UPDATE
AS
BEGIN
    DECLARE @Names VARCHAR(8000) 
    SET @result = ' '

    DECLARE @id INT;
    SELECT @id = i.ID FROM inserted i;      

    IF UPDATE(deptNotes) 
    BEGIN
        DECLARE @OldValue NVARCHAR(MAX)

        SELECT TOP 1 @OldValue = deptNotes 
        FROM Activity 
        WHERE id = @id 
        ORDER BY Timestamp DESC

        IF (@OldValue != (SELECT i.deptNotes FROM inserted i))        
        BEGIN
            IF ((SELECT i.deptNotes FROM inserted i) != ' ')
               SELECT @result =  @result + ',' + 'Modified dept. Notes'
            ELSE
               SELECT @result =  @result + ',' + 'Removed dept. Notes'
        END
   END

   IF UPDATE(deptActivityID) 
   BEGIN
       DECLARE @OldValue1 NVARCHAR(MAX)

       SELECT TOP 1 @OldValue1 = deptActivityID 
       FROM Activity 
       WHERE id = @id  
       ORDER BY Timestamp DESC

       IF (@OldValue1 != (SELECT i.deptActivityID FROM inserted i))           
       BEGIN
           SELECT @result =  @result + ',' + 'Changed dept. Activity  ' 
       END
    END

    IF UPDATE(SubmissionDate) 
    BEGIN
    declare @OldValue2 nvarchar(max)
    select Top 1 @OldValue2 = submissiondate from [Activity] where id=@id Order by Timestamp DESC

     If (@OldValue2 != (select i.submissiondate from inserted i))         
     BEGIN
     Select @result =  @result + ',' + 'Changed application date - ' + '"' + (select cast(i.submissiondate as nvarchar(500)) from inserted i)+ '"' 
     END
     END


     INSERT [Activity]
     ( 
       [deptActivityID], 
       [deptNotes], 
       [SubmissionDate], 
       [Username], 
       [Operation], 
       [Comment]
       )
       SELECT 
       v.deptActivityID, 
       v.deptNotes, 
       v.SubmissionDate,
       v.[LastEditBy],
       'update', 
       @result
       FROM inserted v
       END
       GO

Answer 1

您可以使用num = "" while not isinstance(num, int): num = input("Please, enter a number\n>>> ") try: num = int(num) except ValueError: pass # proceed with your code...表来查找旧值的内容以及新值的deleted。另请注意，INSERT，UPDATE和DELETE可能会影响多行，因此您应该触发它。

下面的触发器代码将为您提供deptNotes中任何更改的行列表。

inserted

如果您的deptNotes可能包含NULL值，则需要使用ISNULL（）来处理

SQL Server触发器检查列值是否已更改为insert

1 个答案: