Estimated lesson time: 40 minutes in Visual Studio .NET

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Shredding XML Using OPENXML and XML Stored Procedures
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SQL Server 2000 first provided support for shredding XML data into a relational representation by using the OPENXML Transact-SQL instructions and XML stored procedures. SQL Server provides two important stored procedures for shredding XML documents:
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sp_xml_preparedocument takes an XML document, parses it using an XML parser, and loads it into memory in a DOM-like structure. The stored procedure returns a memory handle to the in-memory parsed structure as an output parameter. sp_xml_removedocument receives a memory handle to a parsed XML structure; then deallocates and cleans up the memory space.
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Lesson 5: Converting Between XML Data and Relational Data
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Between these two calls, developers must use the OPENXML statement to transform the loaded XML structure into tabular format. The OPENXML statement returns a result set, so you can use it wherever a result set is expected inside the Transact-SQL language for example, in the FROM clause of a SELECT statement. SQL Server 2005 implements two important changes to the way OPENXML works:
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It adds support to the new data types available in SQL Server 2005, including the XML data type and the (n)varchar(max) data types. It uses a new version of the MSXML parser that is used to parse the input XML, optimized especially for SQL Server loading requirements.
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Memory requirements for using OPENXML
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One of the most important issues in using OPENXML is that you need to fully load the XML document into memory before shredding it into relational data. Depending on the size of the XML document, this process can allocate a lot of memory from the database server. You need to run tests to ensure that loading the XML document into memory will not overly tax your installation.
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Using OPENXML
The OPENXML statement receives three input parameters: the handle to the in-memory parsed XML structure, an XPATH expression that filters the XML nodes to be processed, and an optional mapping scheme. The mapping scheme is used to define the relationship between the XML elements and attributes and a table schema. OPENXML supports two mapping modes: implicit mapping and explicit mapping. The OPENXML statement also enables you to declare a table schema to define the table format that should be returned by the execution of the OPENXML statement. The examples in this lesson will be based on the initial query from Lesson 2 in this chapter:
USE AdventureWorks GO DECLARE @X XML SET @X = ( SELECT Department.[DepartmentID] 'Department/@id' ,Department.[Name] 'Department/@name', ( SELECT History.[EmployeeID] 'Employee/@id' ,History.[StartDate] 'Employee/@StartDate' ,DATEDIFF(year, History.[StartDate], GetDate()) 'Employee/@YearsInRole'
8
Managing XML Data
FROM HumanResources.EmployeeDepartmentHistory History WHERE Department.DepartmentID = History.DepartmentID AND History.EndDate IS NULL ORDER BY History.[StartDate] FOR XML PATH(''), TYPE ) 'Department/Employees' FROM HumanResources.Department ORDER BY Department.[DepartmentID] FOR XML PATH (''),ROOT('Departments'), TYPE)
A partial result of executing this query is as follows:
<Departments> ... <Department id="2" name="Tool Design"> <Employees> <Employee id="5" StartDate="1998-01-11T00:00:00" YearsInRole="8" /> <Employee id="4" StartDate="2000-07-01T00:00:00" YearsInRole="6" /> <Employee id="263" StartDate="2001-01-05T00:00:00" YearsInRole="5" /> <Employee id="265" StartDate="2001-01-23T00:00:00" YearsInRole="5" /> </Employees> </Department> ... </Departments>
Implicit Mapping in OPENXML
The OPENXML statement provides an implicit XML mapping infrastructure in which SQL Server tries to automatically map XML elements and attributes into columns. The mapping is based on two items:
A flag value that tells SQL Server to interpret the XML as an attribute-centric structure, as an element-centric structure, or as a combination of the two. Table 8-6 describes the key values to specify in the flags parameter.
Flag Values for Implicit Mapping in OPENXML
Table 8-6
Value 0 1
Description SQL Server 2005 will try to extract the values by using attribute-centric mapping. Each XML attribute will be converted into a column. SQL Server 2005 will try to extract the values by using attribute-centric mapping. Each XML attribute will be converted into a column. If columns are not mapped yet, element-centric mapping is applied. SQL Server 2005 will try to extract the values by using element-centric mapping. Each XML element will be converted into a column.
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