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Read XML data by using the XmlReader. Read all XML element and attribute content. Read specific element and attribute content. Read XML data by using the XmlTextReader class. Read node trees by using the XmlNodeReader class. Validate XML data by using the XmlValidatingReader. Write XML data by using the XmlWriter class. Manage XML with the XML Document Object Model (DOM). Read XML data into the DOM. Modify an XML document by adding and removing nodes. Modify nodes within an XML document. Write data in XML format from the DOM. Work with nodes in the XML DOM. Handle DOM events. Modify the XML declaration.

Sometimes you will need to roll back a series of tasks if one of the tasks fails, but you want to go back only to the point of failure, not to the start of the package. To do this, you need to enable checkpoints in the package and then use a Sequence Container that holds all the associated tasks. The Sequence Container needs to have the transactions turned on by setting the Transactionoption to Required at the container level.

The method and location variables tell HttpRequest how and where to direct the HTTP call To form the web address we use the script function createArgList(), turning the args.

Lessons in this chapter:

In this practice, you will turn on transactions at the container level and observe the results when a task fails within the container. You will also enable checkpoints for a package and observe the results.

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In this exercise, you will enable a transaction for a Sequence Container and observe the data results after an error occurs in another task within the same container.

Lesson 1: Reading and Writing XML with the XmlReader and XmlWriter Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443 Lesson 2: Managing XML with the XML Document Object Model. . . . . . . . 465

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1. 2.

You can use the ReadInnerXml and ReadOuterXml methods to return portions of the XML file as strings. The ReadInnerXml method returns the contents of the current XML node, including child nodes but excluding the opening and closing nodes them selves. The ReadOuterXml method returns the contents of the current XML node, including child nodes as well as the opening and closing nodes. For example, con sider the following XML fragment:

In Control Panel, select Administrative Tools and then Services to open the Services console. If necessary, start the Distributed Transaction Coordinator (MSDTC) service. Open the SSIS project named TK 70-448 SSIS Project in SQL Server Business Intelligence Development Studio (BIDS) that you created in 1, Developing SSIS Packages, and then open the package named MyPackage.dtsx. Alternatively, you can use the 448-ch02 Start Here project in your Documents\Microsoft Press\MCTS Training Kit 70-448\Source\Ch 02\ folder. Choose Properties Window from the View menu to open the Properties window. Click the Auto Hide button, which resembles a pushpin, in the Properties window to lock the window in the open position. In the Control Flow design surface, select the Sequence Container object by clicking it, and then note the Sequence Container properties listed in the Properties window. Set the TransactionOption property to Required using the drop-down list. Save the package by clicking the Save button on the toolbar. Next, drag a new Execute SQL Task from the toolbox to the bottom of the Sequence Container workspace just below the Data Flow Task. Connect the Data Flow Task to the new Execute SQL Task by dragging the output arrow from the bottom of the Data Flow Task onto the Execute SQL Task.

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4. 5. 6. 7. 8.

If XmlReader is positioned on <text1>, ReadInnerXml returns the following string:

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b. Modify the SQLStatement property and type the following statement:

and moves the position of XmlReader to <text2>. Given the same XML fragment, ReadOuterXml returns the following string:

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