SSIS:在更新或插入后删除行 [英] SSIS : delete rows after an update or insert

问题描述

以下是以下情况: 我有一个 StudentsA 表，该表需要与另一台服务器 StudentsB 上的另一个表同步.这是从A到B的单向同步. 由于学生表A可以容纳大量行，因此我们有一个名为 StudentsSync 的表(在输入服务器上)，其中包含ID为 StudentsA 的表，自上次修改以来从学生A 复制到学生B .

Here is the following situation: I have a table of StudentsA which needs to be synchronized with another table, on a different server, StudentsB. It's a one-way sync from A to B. Since the table StudentsA can hold a large number of rows, we have a table called StudentsSync (on the input server) containing the ID of StudentsA which have been modified since the last copy from StudentsA to StudentsB.

我完成了以下SSIS数据流任务:

I made the following SSIS Data Flow task:

唯一的问题是，在成功复制或更新后，我需要从 StudentsSync 中删除该行.像这样:

The only problem is that I need to DELETE the row from StudentsSync after a successful copy or update. Something like this:

有什么想法可以实现吗?

Any idea how this can be achieved?

推荐答案

可以使用3种方法实现

1.如果OutputDB中的target表具有TimeStamp列，例如Create和modified TimeStamp，则可以通过编写简单查询来获取具有updated或inserted的行.您需要在Control Flow中的execte sql task中将以下查询写入delete表中的那些行.

1.If your target table in OutputDB has TimeStamp columns such as Create and modified TimeStamp then rows which have got updated or inserted can be obtained by writing a simple query. You need to write the below query in the execte sql task in Control Flow to delete those rows in Sync Table .

Delete from SyncTable
where keyColumn in (Select primary_key from target 
where ModifiedTimeStamp >= GETDATE() or (ModifiedTimeStamp is null
and CreateTimeStamp>=GETDATE()))

我假定StudentsA's primary key与Target表的primary key一起存在于Sync表中.上面的条件基本上检查，如果new row是added，则CreateTimeStamp列将具有current日期，而modifiedTimeStamp将是null，否则，如果值是updated，则modifiedTimeStamp将具有当前日期

I assume StudentsA's primary key is present in Sync table along with primary key of Target table. The above condition basically checks, if a new row is added then CreateTimeStamp column will have current date and modifiedTimeStamp will be null else if the values are updated then the modifiedTimeStamp will have current date

如果您在target表中有TimeStamp列，则上述查询将起作用，如果您将数据加载到Data Warehouse

The above query will work if you have TimeStamp columns in your target table which i feel should be there if your loading data into Data Warehouse

2.您可以使用MERGE语法执行更新并使用Execute SQL Task插入Control Flow中.无需使用Data Flow Task.即​​使您没有任何TimeStamp columns

2.You can use MERGE syntax to perform the update and insert in Control Flow with Execute SQL Task.No need to use Data Flow Task .The below query can be used even if you don't have any TimeStamp columns

DECLARE @Output TABLE ( ActionType VARCHAR(20), SourcePrimaryKey INT)

MERGE StudentsB  AS TARGET
USING StudentsA  AS SOURCE 
ON (TARGET.CommonColumn = SOURCE.CommonColumn) 

WHEN MATCHED 
THEN 
UPDATE SET TARGET.column = SOURCE.Column,TARGET.ModifiedTimeStamp=GETDATE()

WHEN NOT MATCHED BY TARGET THEN 
INSERT (col1,col2,Col3) 
VALUES (SOURCE.col1, SOURCE.col2, SOURCE.Col3)

OUTPUT $action, 
INSERTED.PrimaryKey AS SourcePrimaryKey INTO @Output

Delete from SyncTable
where PrimaryKey in (Select SourcePrimaryKey from @Output
                     where ActionType ='INSERT' or ActionType='UPDATE')

该代码没有经过测试，因为我已经没时间了.但是至少，它应该可以使您对如何进行操作有一个清晰的了解.有关MERGE语法的更多详细信息，请阅读此

The code is not tested as i'm running out of time .but at-least it should give you a fair idea how to proceed . .For furthur detail on MERGE syntax read this and this

3.使用Multicast组件将duplicate和Update的数据集duplicate连接到lookmatch输出到lookmatch并将另一个多播连接到Lookup No match output

3.Use Multicast Component to duplicate the dataset for Insert and Update .Connect a MULTICAST to lookmatch output and another multicast to Lookup No match output

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