qr code generator c# Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement in Visual C#

Encoder QR Code in Visual C# Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement

Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement
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Verify that a row is returned with the required data. In the existing query window, below the existing code, type, highlight, and execute the following command to undo the change that you made to the SalesOrderDetail row:
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ROLLBACK TRANSACTION;
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Save the script and close the query window. Leave SSMS open for the next exercise.
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Use the MERGE Statement and OUTPUT Clause
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In this exercise, you execute a script that creates a SalesOrderDetailHistory table in the AdventureWorks2008 database. You then use the MERGE statement and the OUTPUT clause to maintain the data in the SalesOrderDetailHistory table, as well as provide auditing information about the modifications made to the SalesOrderDetailHistory table.
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In SSMS, open a new query window. Open, review, and execute the Lesson02 PracticeSetup.sql file, which can be found among the accompanying sample files in the Practice folder to create the SalesOrderDetailHistory table from the SalesOrderDetail table. The script also adds the Cancelled column and sets the initial values to False. Finally, the script adds an audit table to hold information about modifications performed by the MERGE statement. Review the result set and notice that all the rows from the SalesOrderDetail table have been copied to the new SalesOrderDetailHistory table. This exercise deals with SalesOrderID 43659, so review the rows relating to 43659. Open a new query window. In the new query window, type and execute the following command to start a new transaction, and insert a row into the SalesOrderDetail table, modify the OrderQty of a row, and delete a row from the SalesOrderDetail table:
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USE AdventureWorks2008;
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BEGIN TRANSACTION;
DELETE FROM Sales.SalesOrderDetail WHERE SalesOrderID = 43659 AND SalesOrderDetailID = 1 INSERT INTO Sales.SalesOrderDetail (SalesOrderID, CarrierTrackingNumber, OrderQty, ProductID , SpecialOfferID, UnitPrice, UnitPriceDiscount , rowguid, ModifiedDate) VALUES (43659, '4911-403-C-98', 1, 745 , 1, 809.76, 0.00 , DEFAULT, DEFAULT) UPDATE Sales.SalesOrderDetail SET OrderQty = 2 WHERE SalesOrderID = 43659 AND SalesOrderDetailID = 2;
Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
In the existing query window, below the existing code, type, highlight, and execute the following code to merge the changes into the Sales.SalesOrderDetailHistory table as well as add the required information about the merge to the MergeAudit table:
SET IDENTITY_INSERT Sales.SalesOrderDetailHistory ON;
MERGE INTO Sales.SalesOrderDetailHistory AS SODH USING Sales.SalesOrderDetail AS SOD ON SODH.SalesOrderID = SOD.SalesOrderId AND SODH.SalesOrderDetailID = SOD.SalesOrderDetailID WHEN NOT MATCHED BY TARGET THEN INSERT (Linetotal, SalesOrderID, SalesOrderDetailID , CarrierTrackingNumber, OrderQty, ProductID , SpecialOfferID, UnitPrice, UnitPriceDiscount , rowguid, ModifiedDate, Cancelled) VALUES (Linetotal, SalesOrderID, SalesOrderDetailID , CarrierTrackingNumber, OrderQty, ProductID , SpecialOfferID, UnitPrice, UnitPriceDiscount , rowguid, ModifiedDate,DEFAULT) WHEN NOT MATCHED BY SOURCE THEN UPDATE SET SODH.Cancelled = 'True' WHEN MATCHED AND (SODH.OrderQty <> SOD.OrderQty OR SODH.SpecialOfferID <> SOD.SpecialOfferID OR SODH.UnitPrice <> SOD.Unitprice OR SODH.UnitPriceDiscount <> SOD.UnitPriceDiscount) THEN UPDATE SET SODH.OrderQty = SOD.OrderQty , SODH.SpecialOfferID = SOD.SpecialOfferID , SODH.UnitPrice = SOD.Unitprice , SODH.UnitPriceDiscount = SOD.UnitPriceDiscount , SODH.Linetotal = SOD.Linetotal OUTPUT inserted.salesorderid,inserted.salesorderdetailid, getdate(), $action INTO MergeAudit ;
SELECT * from Sales.SalesOrderDetailHistory WHERE Salesorderid = 43659;
SELECT * FROM MergeAudit;
In the existing query window, below the existing code, type, highlight, and execute the following command to undo the changes that you made:
ROLLBACK TRANSACTION;
Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement
8. 9.
Save the script and close the query window. Verify that you have closed all the query windows opened during this practice, and then open, review, and execute the Lesson02 PracticeCleanup.sql file, which can be found among the accompanying sample files in the 2/Lesson 2 folder.
Lesson Summary
The OUTPUT clause allows you to redirect information to the calling application, or to an object such as a table or a table variable, about the INSERT, UPDATE, or DELETE statement performed. The MERGE statement allows you to perform DML actions on a target table based on whether or not a row matches information found in a source table.
Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
Lesson 3: Managing transactions
Because data manipulation is a prominent function in Online Transaction Processing (OLTP) databases, transactions are important in managing and maintaining consistent data.
After this lesson, you will be able to:
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