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Code available on the companion CD
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The files in the 8\Lesson 4\Updategram\Updategram.csproj Visual Studio project provide the solution for the exercises in Practice 2 in this lesson.
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Practice 2: Insert New Rows by Using a SQLXML Updategram
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In the practice in Lesson 3, you created an annotated XSD schema for the UniversalLog table. In this exercise, you create an updategram that matches that schema and use it to insert new records into the UniversalLog table. 1. Create an updategram to insert new values into the UniversalLog table. Use this updategram as a reference:
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<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:header> <updg:param name="AppName"></updg:param> <updg:param name="Message"></updg:param> </updg:header> <updg:sync mapping-schema="UniversalLogSchema.xsd"> <updg:before> </updg:before>
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Managing XML Data
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<updg:after> <Log Timestamp="2000-01-01T06:00:00.000"> <Application>$AppName</Application> <Details>$Message</Details> </Log> </updg:after> </updg:sync> </ROOT>
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2. Create a console application in Visual Studio 2005 to execute this updategram. Your code should look like this:
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SqlXmlCommand cmd = new SqlXmlCommand("Provider=sqloledb;Data Source=(local); Initial Catalog=TK4318;User Id=sa;"); cmd.CommandStream = new FileStream("NewLogRecordUpdategram.xml", FileMode.Open, FileAccess.Read); cmd.CommandType = SqlXmlCommandType.DiffGram; SqlXmlParameter appName = cmd.CreateParameter(); appName.Name = "@AppName"; appName.Value = "CustomerAssistance"; SqlXmlParameter message = cmd.CreateParameter(); message.Name = "@Message"; message.Value = @"<logRecord machine='WebHostingServer' timestamp='2000-0101T06:00:00Z'> <post eventType='appStart'><moreInformation>The web server is under attack</ moreInformation> </post></logRecord>"; cmd.ExecuteNonQuery();
Lesson Summary
SQL Server 2005 supports updating XML documents. It supports modifying both XML values and the XML structure. The XML data type in SQL Server 2005 implements the modify() method to allow updating of XML data. The modify() method accepts as input parameters an XQUERY language extension for data manipulation. SQLXML updategrams enable you to update relational data represented as XML data. SQLXML updategrams are XML documents that compare the original and current versions of XML data. They then execute Transact-SQL INSERT, UPDATE, and DELETE statements based on the differences between the versions. You can execute updategrams from .NET applications.
Lesson 4: Modifying XML Data
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of this book.
1. Which of the following technologies would you use to update the XML values as well as the XML structure of an XML document A. SQLXML-annotated XSD schemas B. SQLXML updategrams C. The modify() method of the XML data type with XML DML D. OPENXML in an UPDATE statement 2. What is the result of executing the following XML DML expression
SET @X.modify(' insert for $e in /Departments/Department[@id=1]/Employees/Employee return $e before (/Departments/Department[@id=1]/Employees/Employee)[1]')
A. Inserts the constant expression for $e in /Departments/Department [@id=1]/Employees/Employee return $e as a child of the /Departments/ Department[@id=1]/Employees/Employee node. B. Duplicates the nodes contained inside /Departments/Department[@id=1]/ Employees/Employee. C. Copies the contents of the /Departments/Department[@id=1]/Employees/ Employee node into the first Employee node found under Employees, under Department, and under Departments. D. Returns an error: XQUERY not supported with the insert XML DML keyword.
8
Managing XML Data
Lesson 5: Converting Between XML Data and Relational Data
Previous lessons examined the various techniques you can use to retrieve XML data from SQL Server 2005. This lesson focuses on the opposite operation: converting XML data into relational data, often called shredding. SQL Server 2005 offers three options for shredding XML data:
Use OPENXML and the XML stored procedures. Use the XML data type s nodes() method along with the APPLY operators. Use the SQLXML middle-tier API to bulk load XML data.
This lesson covers the most important techniques for converting XML data into relational data and, where appropriate, references external documentation so that you can learn more about a specific feature. All code examples in this lesson use the AdventureWorks sample database installed by SQL Server 2005 Setup.
After this lesson, you will be able to:
Choose the proper strategy between using OPENXML, the nodes() method in the XML data type, and SQLXML-annotated XSD schemas when shredding XML data. Decide when to use implicit or explicit mapping when using OPENXML. Use the APPLY operators when querying an XML data type column. Create annotated XSD schemas and bulk load XML data into the database.
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