Scénář:
Někdy máme požadavek povolit CDC v tabulce včetně všech sloupců NEBO povolit CDC v tabulce se sadou sloupců. SP může provádět oba úkoly v závislosti na poskytnutých parametrech. Tato uložená procedura se použije, když CDC již není povoleno v tabulce. Pokud je již v tabulce povolena funkce Change Data Capture (CDC), uložená procedura neprovede žádnou akci.
Řešení:
Níže uloženou proceduru lze použít k povolení CDC pro všechny sloupce tabulky nebo libovolné vybrané sloupce. USE [DatabaseName]
GO
/*-----------------------------------------------------------------------------------------------------
How to Execute: EXEC usp_EnableCdcOnTableWithOrWithoutColumnList @pSchemaName,@pTableName,@pColumnList
Enable CDC on Table with All columns
Example :usp_EnableCdcOnTableWithOrWithoutColumnList 'SchemaName','TableName',NULL
Enable CDC on Table with Given columns
Example :usp_EnableCdcOnTableWithOrWithoutColumnList 'SchemaName','TableName','Col1,Col2'
---------------------------------------------------------------------------------------------------------*/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[Usp_enablecdcontablewithorwithoutcolumnlist]
@pSchemaName VARCHAR(50),--> Provide the Schema Name where table exists
@pTableName VARCHAR(100),--> TableName to ENABLE CDC ON.
@pColumnList VARCHAR(1000)--> ColumnList eg.'col1,col2'
AS
BEGIN
--DECLARE LOCAL VARIABLES
DECLARE @vSQLStatment NVARCHAR(MAX)
DECLARE @vSQLEnableCDC NVARCHAR(MAX)
DECLARE @vXML XML;
DECLARE @vCDCEnableInd INT
DECLARE @vColumnCount INT
-- IF CDC ALREADY ENABLED
SET @vCDCEnableInd=(SELECT is_tracked_by_cdc
FROM sys.tables
WHERE name = @pTableName)
-- CHECK IF CORRECT TABLE NAME IS PROVIDED
IF NOT EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @pTableName)
BEGIN
PRINT ' The given table does not exists in Database::'
+ @pTableName
END
-- ENABLE CDC WITH ALL THE COLUMNS IF NO COLUMNS PROVIDED
ELSE
BEGIN
IF @pColumnList IS NULL
AND @vCDCEnableInd = 1
BEGIN
PRINT 'CDC is alrady enabled on ::' + @pTableName
END
IF @pColumnList IS NULL
AND @vCDCEnableInd = 0
BEGIN
SELECT @vSQLStatment = 'EXEC sys.sp_cdc_enable_table
@source_schema = ''' + @pSchemaName
+ ''',
@source_name = ''' + @pTableName
+ ''',
@role_name = null;'
EXEC sp_executesql
@vSQLStatment
PRINT ' CDC Enabled on ::' + @pTableName
+ ' for all the columns'
END
-- IF COLUMN LIST IS PROVIDED FOR CDC
IF ( LEN(@pColumnList) > 0 )
BEGIN
SET @vXML=CAST('' + REPLACE(@pColumnList, ',', '')
+ '
' AS XML);
-- CHECK IF Incorrect COLUMN NAME IS PROVIDEDED
SELECT @vColumnCount = COUNT(*)
FROM @vXML.nodes('/a') AS R(nref)
WHERE NOT EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS I
WHERE I.TABLE_NAME = @pTableName
AND I.COLUMN_NAME = nref.value('.', 'nvarchar(50)'))
IF ( @vColumnCount <> 0 )
PRINT ' The List of Columns provided do not exit in Source Table.Check the ColumnList'
-- IF All columns Exists in Source Table, Enable CDC
IF ( @vColumnCount = 0
AND @vCDCEnableInd = 1 )
BEGIN
PRINT ' The CDC is already Enabled for this table.'
END
IF ( @vColumnCount = 0
AND @vCDCEnableInd = 0 )
BEGIN
--Enable CDC
SET @vSQLEnableCDC='EXEC sys.sp_cdc_enable_table
@source_schema=''' + @pSchemaName
+ ''',@source_name=''' + @pTableName
+ ''', @role_name=NULL, @captured_column_list= '''
+ @pColumnList + ''''
EXEC (@vSQLEnableCDC)
PRINT ' CDC Enabled on ::' + @pTableName + ' for '
+ @pColumnList + ' Columns.'
END
END
END
END
