Scenarie:
Nogle gange har vi krav om at aktivere CDC på tabel inklusive alle kolonnerne ELLER aktivere CDC på tabel med sæt af kolonner. SP'en kan udføre begge opgaver afhængigt af de angivne parametre. Denne lagrede procedure vil blive brugt, når CDC allerede ikke er aktiveret på tabellen. Hvis Change Data Capture (CDC) allerede er aktiveret i tabel , udfører den lagrede procedure ingen handling.
Løsning:
Nedenstående gemte procedure kan bruges til at aktivere CDC på alle kolonnerne i en tabel eller hvilke som helst valgte kolonner. 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
