在SSIS 2012中使用CDC（数据变更捕获）

最新项目稍有空隙，开始研究SQL Server 2012和2014的一些BI特性，参照(Matt)的一个示例，我们开始体验SSIS中的CDC（Change Data Capture,变更数据捕获）。

注：如果需要了解关于SQL Server 2008中的CDC，请看这里http://www.cnblogs.com/downmoon/archive/2012/04/10/2439462.html），本文假定读者对CDC的工作方式已有所了解。^_^。

我们分三步完成实例：

1、准备基础数据；

2、设计一个初始包；

3、在2的基础上设计一个增量包。

首先请完成以下准备安装：

（1）Visual studio 2012或Visual Studio 2012 Shell (Isolated) Redistributable Package

http://www.microsoft.com/en-us/download/details.aspx?id=30678

http://www.microsoft.com/en-us/download/details.aspx?id=30670

（2）SQL Server Data Tools - Business Intelligence for Visual Studio 2012

http://www.microsoft.com/zh-cn/download/details.aspx?id=36843

（2）SQL Server 2012企业版或开发版

http://www.microsoft.com/en-us/download/details.aspx?id=29066

（3）示例数据库AdventureWorksDW2012（本文必须，如果自建表则不必）

http://msftdbPRodsamples.codeplex.com/releases/view/55330

好了，开始第一步：

/*-- =============================================-- 创建测试数据库及数据表，借助AdventureWorksDW2012示例数据库---Generate By downmoon(邀月),3w@live.cn-- =============================================*/--Create database CDCTest--GO--USE [CDCTest]--GO--SELECT * INTO DimCustomer_CDC--FROM [AdventureWorksDW2012].[dbo].[DimCustomer]--WHERE CustomerKey < 11500;--select * from DimCustomer_CDC;

/*-- =============================================-- 启用数据库级别CDC，只对企业版和开发版有效---Generate By downmoon(邀月),3w@live.cn-- =============================================*/USE [CDCTest]GOEXEC sys.sp_cdc_enable_dbGO-- add a primary key to the DimCustomer_CDC table so we can enable support for net changesIF NOT EXISTS (SELECT * FROM sys.indexes WHERE object_id = OBJECT_ID(N'[dbo].[DimCustomer_CDC]') AND name = N'PK_DimCustomer_CDC')  ALTER TABLE [dbo].[DimCustomer_CDC] ADD CONSTRAINT [PK_DimCustomer_CDC] PRIMARY KEY CLUSTERED (    [CustomerKey] ASC)GO/*-- =============================================-- 启用表级别CDC---Generate By downmoon(邀月),3w@live.cn-- =============================================*/EXEC sys.sp_cdc_enable_table @source_schema = N'dbo',@source_name = N'DimCustomer_CDC',@role_name = N'cdc_admin',@supports_net_changes = 1GO

/*-- =============================================-- 创建一个目标表，与源表(Source)有相同的表结构--注意，在生产环境中，完全可以是不同的实例或服务器，本例为了方便，在同一个数据库实例的同一个数据库中演示---Generate By downmoon(邀月),3w@live.cn-- =============================================*/SELECT TOP 0 * INTO DimCustomer_DestinationFROM DimCustomer_CDC--select @@version;select * from DimCustomer_Destination;

第二步：创建初始包

-- =============================================-- 我们使用两个包来完成示例，一个初始包完成数据的初始加载，一个增量包完成数据的变更捕获---Generate By downmoon(邀月),3w@live.cn-- =============================================

初始包包含如下逻辑：（1）使用CDC Control Task标记初始加载开始LSN(Use the CDC Control Task to mark the initial load start LSN)（2）转换所有源表数据到目标表（Transfer all of the data from the source table into our destination table）（3）使用CDC Control Task标记初始加载结束LSN（Use the CDC Control Task to mark the initial load end LSN）示例：http://code.msdn.microsoft.com/My-First-Integration-fa41c0b1

新建一个SSIS项目，创建一个包“Initial Load”，如下图：

新建两个CDC Control Task,分别命名为“CDC Control Task Start”和“CDC Control Task End”，分别对应属性为“Mark initial load start”和""Mark initial load end"

连接管理器均为ADO.NET方式，其他属性如下图：

中间加入一个“Data Flow Task”,属性默认。

此时，运行包，可见CDC_States有初始标记。

第三步：创建增量包

增量包包含如下逻辑：（1）创建一个源数据库的连接管理器(Create a connection manager for the Source database)（2）设置CDC运算符以获取处理边界（Set the CDC Control Operation to Get processing range）（3）创建一个新的CDC状态变量(CDC_state)（Create a new CDC state variable (CDC_state)）（4）创建一个目标数据库的连接管理器(Create a connection manager for the Destination database)（5）选择前面初始加载包创建的状态表(Select the state table (this was created by the Initial Load package) – [dbo].[cdc_states])（6）设置状态名称（必须匹配初始加载包使用过的状态名称，this must match what was used in the Initial Load package (CDC_State)）

在项目中创建一个新包，命名为“Incremental Load”

在包的"Control Flow"视图中，自上而下分别手动6个Task，顺序如下图，除去上面用到的三个Task,其余均为Execute SQL Task

注意：CDC Control Task End的CDC运算符为MARK Process Range，CDC Control Task Start的CDC运算符为Get Process Range

其余4个Execute SQL Task的SQL语句如下：

--Create stage TablesIF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[stg_DimCustomer_UPDATES]') AND type in (N'U'))BEGIN   SELECT TOP 0 * INTO stg_DimCustomer_UPDATES   FROM DimCustomer_DestinationENDIF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[stg_DimCustomer_DELETES]') AND type in (N'U'))BEGIN   SELECT TOP 0 * INTO stg_DimCustomer_DELETES   FROM DimCustomer_DestinationEND

-- batch updateUPDATE destSET     dest.FirstName = stg.FirstName,     dest.MiddleName = stg.MiddleName,    dest.LastName = stg.LastName,     dest.YearlyIncome = stg.YearlyIncomeFROM     [DimCustomer_Destination] dest,     [stg_DimCustomer_UPDATES] stgWHERE     stg.[CustomerKey] = dest.[CustomerKey]

-- batch deleteDELETE FROM [DimCustomer_Destination]  WHERE[CustomerKey] IN (    SELECT [CustomerKey]    FROM [dbo].[stg_DimCustomer_DELETES])

-- truncate table truncate table  [dbo].[stg_DimCustomer_DELETES]truncate table  [dbo].[stg_DimCustomer_UPDATES]

最关键的一步，选中CDC Control Task Start，并切换到Data Flow，自上而下分别拖动CDC Source，CDC Splitter Transformer，三个ADO.NET Destination，如下图：

其中三个的目标表分别为：[DimCustomer_Destination],stg_DimCustomer_DELETES,stg_DimCustomer_UPDATES。

而CDC Source的连接管理器属性如下图：

此时，可运行增量包，但我们不会看到任何运行结果，因为此时我们还没有进行数据的Insert或Update操作。

下来我们提供一个脚本，测试下效果：

-- =============================================-- 更新一些数据,以显示SSIS 2012中CDC的效果---Generate By downmoon(邀月),3w@live.cn-- =============================================USE [CDCTest]GO -- Transfer the remaining customer rowsSET IDENTITY_INSERT DimCustomer_CDC ON INSERT INTO DimCustomer_CDC(       CustomerKey, GeographyKey, CustomerAlternateKey, Title, FirstName,        MiddleName, LastName, NameStyle, BirthDate, MaritalStatus,        Suffix, Gender, EmailAddress, YearlyIncome, TotalChildren,        NumberChildrenAtHome, EnglishEducation, SpanishEducation,       FrenchEducation, EnglishOccupation, SpanishOccupation,        FrenchOccupation, HouSEOwnerFlag, NumberCarsOwned, AddressLine1,        AddressLine2, Phone, DateFirstPurchase, CommuteDistance)SELECT CustomerKey, GeographyKey, CustomerAlternateKey, Title, FirstName,        MiddleName, LastName, NameStyle, BirthDate, MaritalStatus,        Suffix, Gender, EmailAddress, YearlyIncome, TotalChildren,        NumberChildrenAtHome, EnglishEducation, SpanishEducation,       FrenchEducation, EnglishOccupation, SpanishOccupation,        FrenchOccupation, HouseOwnerFlag, NumberCarsOwned, AddressLine1,        AddressL