Scénář:
Pracujete jako SQL Server DBA nebo vývojář, povolili jste Change Data Capture na jedné z SQL Server Database. Po povolení CDC chcete vytvořit AUDIT NEBO HIST Viewsso může získat změněné záznamy.Řešení:
Níže uvedený skript vytvoří pohled pro každou tabulku, ve které je ve vaší databázi povoleno CDC. Použil jsem schéma auditu, než spustíte skript, musíte vytvořit schéma auditu nebo Pokud chcete vytvořit pohledy ve schématu Hist, změňte Schéma v kódu níže od auditu k historii.Každý pohled nás vrátí pod sloupce
- Commit_Time,
- Název_sloupce,
- Stará_hodnota,
- Nová_hodnota,
- ModifiedBy
IF OBJECT_ID(N'tempdb..##CDC_TableList') IS NOT NULL
BEGIN DROP TABLE ##CDC_TableList
END
SELECT T.name AS TableName,
C.name AS ColumnName,
'CASE WHEN (sys.Fn_cdc_is_bit_set (sys.Fn_cdc_get_column_ordinal (''dbo_'
+ T.name + ''',''' + C.name+
+ '''),__$update_mask) = 1) THEN Cast('
+ C.Name
+ ' AS SQL_VARIANT) ELSE NULL END AS '
+ C.name AS CaseStm INTO ##CDC_TableList FROM sys.tables T INNER JOIN sys.columns c ON T.OBJECT_ID = c.OBJECT_ID
WHERE is_tracked_by_cdc = 1 AND c.is_identity = 0 AND C.name NOT IN ( 'CreatedBy', 'CreatedDate', 'ModifiedBy', 'ModifiedDate' ) AND T.TYPE='U' AND T.is_ms_shipped<>1 -- Select * from sys.tables DECLARE @TableName NVARCHAR(200)
DECLARE cdc_cursor CURSOR FOR SELECT DISTINCT TableName FROM ##CDC_TableList
OPEN cdc_cursor
FETCH NEXT FROM cdc_cursor INTO @TableName WHILE @@FETCH_STATUS = 0
BEGIN DECLARE @ColumnList NVARCHAR(MAX)
DECLARE @CaseStmList NVARCHAR(MAX)
DECLARE @SQL_Stm NVARCHAR(MAX)
DECLARE @SQL_Stm_DropView NVARCHAR(MAX)
PRINT @TableName
SELECT @ColumnList = STUFF(o.COLUMNNAME, 1, 1, '')
FROM ##CDC_TableList t CROSS APPLY (SELECT ',' + ColumnName+CHAR(10) AS [text()]
FROM ##CDC_TableList c
WHERE c.TableName = t.TableName
FOR XML PATH('')) o (COLUMNNAME)
WHERE t.TableName=@TableName
PRINT @ColumnList
SELECT @CaseStmList = STUFF(o.COLUMNNAME, 1, 1, '')
FROM ##CDC_TableList t CROSS APPLY (SELECT ',' + CaseStm+CHAR(10) AS [text()]
FROM ##CDC_TableList c
WHERE c.TableName = t.TableName
FOR XML PATH('')) o (COLUMNNAME)
WHERE t.TableName=@TableName
--PRINT @CaseStmList
--If using Other Schema than AUDIT THEN change to that.
SET @SQL_Stm=' CREATE VIEW AUDIT.vw_'+@TableName+' AS
SELECT sys.Fn_cdc_map_lsn_to_time(up_b.__$start_lsn) AS Commit_Time, up_b.Column_Name, up_b.Old_Value, up_a.New_Value,up_a.ModifiedBy
FROM
( SELECT __$start_lsn, column_name, old_value,ModifiedBy
FROM (SELECT __$start_lsn,'+@CaseStmList+',ModifiedBy FROM cdc.fn_cdc_get_all_changes_dbo_'+@TableName+'( sys.fn_cdc_get_min_lsn(''dbo_'+@TableName+'''), sys.fn_cdc_map_time_to_lsn(''largest less than or equal'',GETDATE()), N''all update old'')
WHERE __$operation = 3
) AS BeforeUpdate
UNPIVOT (old_value FOR column_name IN ('+@ColumnList+') ) AS unp) AS up_b INNER JOIN
(SELECT __$start_lsn, column_name, new_value,ModifiedBy
FROM (SELECT __$start_lsn,'+@CaseStmList+',ModifiedBy FROM cdc.fn_cdc_get_all_changes_dbo_'+@TableName+'(sys.fn_cdc_get_min_lsn(''dbo_'+@TableName+'''), sys.fn_cdc_map_time_to_lsn(''largest less than or equal'',GETDATE()), N''all'')
WHERE __$operation = 4
) AS AfterUpdate
UNPIVOT (new_value FOR column_name IN ('+@ColumnList+') ) AS unp ) AS up_a
ON up_b.__$start_lsn = up_a.__$start_lsn AND up_b.column_name = up_a.column_name'
--Drop View if already exists
SET @SQL_Stm_DropView= 'IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS
WHERE TABLE_NAME = ''vw_'+@TableName+''')
DROP VIEW AUDIT.vw_'+@TableName
PRINT @SQL_Stm_DropView
EXEC (@SQL_Stm_DropView) EXEC ( @SQL_Stm)
FETCH NEXT FROM cdc_cursor INTO @TableName
END CLOSE cdc_cursor DEALLOCATE cdc_cursor