很高兴您已经找到了解决方案...
我只是在想类似的事情......
您的方法将在任何微小的变化时复制两份完整记录。由于我必须处理包含很多列的表，其中一些是 BLOB，这不适合我。
嗯，我没有找到绝对“干净”的方法，但是通过以下方式，您将获得一个 AuditLog，其中仅包含已更改为更好阅读样式的值。
也许你喜欢它：
Test.scenario
编辑：添加了对 INSERT 和 DELETE 和 NULL 值的支持。
试试看：
CREATE TABLE AuditTest(TableSchema VARCHAR(250), TableName VARCHAR(250), AuditType VARCHAR(250),Content XML, LogDate DATETIME DEFAULT GETDATE());
GO
CREATE TABLE dbo.Test(ID INT,Test1 VARCHAR(100),Test2 DATETIME,ModifyCounter INT DEFAULT 0,LastModified DATETIME DEFAULT GETDATE());
INSERT INTO dbo.Test(ID,Test1,Test2) VALUES
(1,'Test1',{d'2001-01-01'})
,(2,'Test2',{d'2002-02-02'});
--当前内容
SELECT * FROM dbo.Test;
GO
--审计的触发器
CREATE TRIGGER [dbo].[UpdateTestTrigger]
ON [dbo].[Test]
FOR UPDATE,INSERT,DELETE
AS
BEGIN
IF NOT EXISTS(SELECT 1 FROM deleted) AND NOT EXISTS(SELECT 1 FROM inserted) RETURN;
DECLARE @tp VARCHAR(10)=CASE WHEN EXISTS(SELECT 1 FROM deleted) AND EXISTS(SELECT 1 FROM inserted) THEN 'upd'
ELSE CASE WHEN EXISTS(SELECT 1 FROM deleted) AND NOT EXISTS(SELECT 1 FROM inserted) THEN 'del' ELSE 'ins' END END;
WITH UpdateableCTE AS
(
SELECT t.LastModified,t.ModifyCounter
FROM dbo.Test AS t
INNER JOIN inserted AS i ON t.ID=i.ID
)
UPDATE UpdateableCTE SET LastModified=GETDATE()
,ModifyCounter=ModifyCounter+1;
SELECT * INTO #tmpInserted FROM inserted;
SELECT * INTO #tmpDeleted FROM deleted;
DECLARE @tableSchema VARCHAR(250)='dbo';
DECLARE @tableName VARCHAR(250)='Test';
DECLARE @cols VARCHAR(MAX)=
STUFF
(
(
SELECT ',' + CASE WHEN @tp='upd' THEN
'CASE WHEN (i.[' + COLUMN_NAME + ']!=d.[' + COLUMN_NAME + '] ' +
'OR (i.[' + COLUMN_NAME + '] IS NULL AND d.[' + COLUMN_NAME + '] IS NOT NULL) ' +
'OR (i.['+ COLUMN_NAME + '] IS NOT NULL AND d.[' + COLUMN_NAME + '] IS NULL)) ' +
'THEN ' ELSE '' END +
'(SELECT ''' + COLUMN_NAME + ''' AS [@name]' +
CASE WHEN @tp IN ('upd','del') THEN ',ISNULL(CAST(d.[' + COLUMN_NAME + '] AS NVARCHAR(MAX)),N''##NULL##'') AS [@old]' ELSE '' END +
CASE WHEN @tp IN ('ins','upd') THEN ',ISNULL(CAST(i.[' + COLUMN_NAME + '] AS NVARCHAR(MAX)),N''##NULL##'') AS [@new] ' ELSE '' END +
' FOR XML PATH(''Column''),TYPE) ' + CASE WHEN @tp='upd' THEN 'END' ELSE '' END
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA=@tableSchema AND TABLE_NAME=@tableName
FOR XML PATH('')
),1,1,''
);
DECLARE @cmd VARCHAR(MAX)=
'SET LANGUAGE ENGLISH;
WITH ChangedColumns AS
(
SELECT COALESCE(i.ID,d.ID) AS ID
,Col.*
FROM #tmpInserted AS i
FULL OUTER JOIN #tmpDeleted AS d ON i.ID=d.ID
CROSS APPLY
(
SELECT ' + @cols + '
FOR XML PATH(''''),TYPE
) AS Col([Column])
)
INSERT INTO AuditTest(TableSchema,TableName,AuditType,Content)
SELECT ''' + @tableSchema + ''',''' + @tableName + ''',''' + @tp + '''
,(
SELECT ''' + @tableSchema + ''' AS [@TableSchema]
,''' + @tableName + ''' AS [@TableName]
,''' + @tp + ''' AS [@ActionType]
,(
SELECT ChangedColumns.ID AS [@ID]
,(
SELECT x.[Column] AS [*],''''
FROM ChangedColumns AS x WHERE x.ID=ChangedColumns.ID
FOR XML PATH(''''),TYPE
)
FROM ChangedColumns
FOR XML PATH(''Row''),TYPE
)
FOR XML PATH(''Changes'')
);';
EXEC (@cmd);
DROP TABLE #tmpInserted;
DROP TABLE #tmpDeleted;
END
GO
--现在我们用一些操作来测试一下：
UPDATE dbo.Test SET Test1='New 1' WHERE ID=1;
UPDATE dbo.Test SET Test1='New 1',Test2={d'2000-01-01'} ;
DELETE FROM dbo.Test WHERE ID=2;
DELETE FROM dbo.Test WHERE ID=99; --no affect
INSERT INTO dbo.Test(ID,Test1,Test2) VALUES
(3,'Test3',{d'2001-03-03'})
,(4,'Test4',{d'2001-04-04'})
,(5,'Test5',{d'2001-05-05'});
UPDATE dbo.Test SET Test2=NULL; --all rows
DELETE FROM dbo.Test WHERE ID IN (1,3);
GO
--检查最终状态
SELECT * FROM dbo.Test;
SELECT * FROM AuditTest;
GO
--清理
DROP TABLE dbo.Test;
GO
DROP TABLE dbo.AuditTest;
GO
第二个动作的结果：更新两行
<Changes TableSchema="dbo" TableName="Test" ActionType="upd">
<Row ID="2">
<Column name="Test1" old="Test2" new="New 1" />
<Column name="Test2" old="Feb 2 2002 12:00AM" new="Jan 1 2000 12:00AM" />
</Row>
<Row ID="1">
<Column name="Test2" old="Jan 1 2001 12:00AM" new="Jan 1 2000 12:00AM" />
</Row>
</Changes>
INSERT 操作的结果：三个新行
<Changes TableSchema="dbo" TableName="Test" ActionType="ins">
<Row ID="5">
<Column name="ID" new="5" />
<Column name="Test1" new="Test5" />
<Column name="Test2" new="May 5 2001 12:00AM" />
<Column name="ModifyCounter" new="0" />
<Column name="LastModified" new="Aug 18 2017 5:48PM" />
</Row>
<Row ID="4">
<Column name="ID" new="4" />
<Column name="Test1" new="Test4" />
<Column name="Test2" new="Apr 4 2001 12:00AM" />
<Column name="ModifyCounter" new="0" />
<Column name="LastModified" new="Aug 18 2017 5:48PM" />
</Row>
<Row ID="3">
<Column name="ID" new="3" />
<Column name="Test1" new="Test3" />
<Column name="Test2" new="Mar 3 2001 12:00AM" />
<Column name="ModifyCounter" new="0" />
<Column name="LastModified" new="Aug 18 2017 5:48PM" />
</Row>
</Changes>
上次DELETE 操作的结果
<Changes TableSchema="dbo" TableName="Test" ActionType="del">
<Row ID="3">
<Column name="ID" old="3" />
<Column name="Test1" old="Test3" />
<Column name="Test2" old="##NULL##" />
<Column name="ModifyCounter" old="2" />
<Column name="LastModified" old="Aug 18 2017 5:48PM" />
</Row>
<Row ID="1">
<Column name="ID" old="1" />
<Column name="Test1" old="New 1" />
<Column name="Test2" old="##NULL##" />
<Column name="ModifyCounter" old="3" />
<Column name="LastModified" old="Aug 18 2017 5:48PM" />
</Row>
</Changes>