Managing XML Data in VS .NET

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Managing XML Data
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But with SQL Server 2005, I have another, easier, option. I can store data in the new XML data type and use the modify() method to insert, delete, or update the XML data. And what s great about the modify() method is that it enables me to modify both values inside XML nodes and the XML structure.
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Modifying XML Values and XML Structure
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Depending on how XML data is stored, SQL Server 2005 offers two different technologies for modifying the data:
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If the data is stored in an XML data type, use the modify() method to insert, delete, or update the XML data. The modify() method supports modifying both the values inside XML nodes and the structure of the XML fragment. If the data is stored in a relational structure but processed as XML, by using either the FOR XML statements or an annotated XSD schema, use the SQLXML Updategrams feature, which supports modifying the XML values inside the XML nodes. Because the data is not stored natively as XML, it does not support modifying the XML structure.
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Using the modify() Method in the XML Data Type
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The XQUERY language does not provide data-manipulation keywords. But Microsoft has extended the XQUERY capabilities in SQL Server 2005 by including a set of instructions that you can use to add, update, or delete XML data (XML DML). The modify() method of the XML data type receives a single input parameter that must be a valid XML DML expression and executes it over the XML fragment that it contains. The XML DML language provided by SQL Server 2005 supports the following keywords:
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insert Instructs SQL Server 2005 to insert one or more nodes as children or siblings of a specified node. The insert construction is made of two expressions and an operator. The first expression can return a single node or a set of nodes. The second expression must return a single node. Both expressions can be constructed by using constant values or by providing an XQUERY expression. The operator that joins both expressions can be one of the following:
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into Indicates that the nodes must be inserted as children of the node identified by the second expression. If the node already has child nodes, the XML DML expression could indicate whether the new nodes should be
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Lesson 4: Modifying XML Data
inserted as the first nodes (by specifying as first into) or as the last nodes (by specifying as last into, which is the default).
after Indicates that the nodes must be inserted after the node identified by the second expression so that they become siblings. before Indicates that the nodes must be inserted before the node identified by the second expression so that they become siblings. replace value of Instructs SQL Server 2005 to update the value of a specified node. The replace value of construction comprises two expressions. The first expression must be a single node. The second expression can be constructed by using constant values or by providing an XQUERY expression that returns a set of nodes. delete Instructs SQL Server 2005 to delete one or more nodes from the XML structure. The delete construction is made of a single XQUERY expression that returns a set of nodes to be removed from the XML instance.
You call the modify() method of the XML data type by using the SET expression, either as a stand-alone expression or as part of an UPDATE statement. When modifying a typed XML instance, the final XML format must be a valid instance of that type as declared on an XML schema collection. Otherwise, a validation error is returned. The examples in this lesson are based on the following 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' 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)
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