Managing XML Data in Visual Studio .NET

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Managing XML Data
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The input parameters enable you to accept external values that you can then use as arguments in the queries declared inside the XML view. The queries inside an XML view can be of two types: XPATH queries, which are executed over an annotated XSD schema, or Transact-SQL queries that use the FOR XML expression. You can write any number of queries inside the XML view, and different queries can fill in different sections of the resulting XML structure. The following sample XML view combines all these features:
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<BonusCandidates xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:header> <sql:param name="DeptID">1</sql:param> </sql:header> <NineAndTenYears> <sql:query> SELECT EmployeeID, StartDate, DATEDIFF(year, StartDate, GETDATE()) AS 'YearsInRole' FROM HumanResources.EmployeeDepartmentHistory AS Employee WHERE (EndDate IS NULL) AND (DATEDIFF(year, StartDate, GETDATE()) > 8) ORDER BY StartDate FOR XML AUTO </sql:query> </NineAndTenYears> <DepartmentOfTheMonth> <sql:xpath-query mapping-schema="EmployeeHiredDate.xsd"> EmployeesByDepartment/Department[@ID=$DeptID] </sql:xpath-query> </DepartmentOfTheMonth> </BonusCandidates>
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The result of executing this XML view is the following:
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<BonusCandidates xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <NineAndTenYears> <Employee EmployeeID="1" StartDate="1996-07-31T00:00:00" YearsInRole="10"/> <Employee EmployeeID="2" StartDate="1997-02-26T00:00:00" YearsInRole="9"/> <Employee EmployeeID="3" StartDate="1997-12-12T00:00:00" YearsInRole="9"/> </NineAndTenYears> <DepartmentOfTheMonth> <Department ID="2" Name="Tool Design"> <Employee ID="4" LoginID="adventure-works\rob0"> <Title>Senior Tool Designer</Title> <HireDate>1998-01-05T00:00:00</HireDate> </Employee> <Employee ID="5" LoginID="adventure-works\thierry0"> <Title>Tool Designer</Title> <HireDate>1998-01-11T00:00:00</HireDate> </Employee> <Employee ID="263" LoginID="adventure-works\ovidiu0"> <Title>Senior Tool Designer</Title> <HireDate>2001-01-05T00:00:00</HireDate> </Employee>
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Lesson 3: Retrieving XML Data by Using SQL Server Middle-Tier Technologies
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<Employee ID="265" LoginID="adventure-works\janice0"> <Title>Tool Designer</Title> <HireDate>2001-01-23T00:00:00</HireDate> </Employee> </Department> </DepartmentOfTheMonth> </BonusCandidates>
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XML view files accept the keywords that Table 8-5 describes.
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Table 8-5
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Keywords for XML View Files
Keyword sql:header sql:param
Description Declares a header section used to declare input parameters. Declares an input parameter. The name attribute indicates the parameter s identification name. The content value represents the default value in case the parameter is not sent when the view is executed. Declares a section in which a Transact-SQL query can be written. This query statement is sent as-is to the database server, so you have access to all query features supported by SQL Server 2005, including the different FOR XML modes explained previously. Declares a section in which an XPATH expression can be written. The mapping-schema attribute points to an annotated XSD schema to be used as source. Note in the previous example that the DeptID attribute is prefixed with the dollar sign ($) when used inside the query.
sql:query
sql:xpath-query
Some important restrictions that exist when using XML views include these:
SQLXML 4.0 does not support all XPATH functions and syntaxes. For example, SQLXML 4.0 does not support the root query (/). Every XPATH query must begin at the top-level element in the schema. In SQLXML 4.0, document order is not always maintained, so XPATH numeric predicates and axes that use document order are not implemented. XPATH axes represent a step in an XPATH expression that defines the set of nodes that the expression should return. And XPATH predicates represent a conditional filter applied to the collection of nodes defined by the axes in an XPATH expression.
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Managing XML Data
Only matching nodes will be returned by the XPATH expression. For example, the XPATH expression Customer[1] indicates that only the first Customer element found should be retrieved. This expression is illegal in SQLXML 4.0.
SQLXML 4.0 does not support cross-product XPATH queries. For example, SQLXML does not support the following query, which selects all Customers with any Order for which the OrderDate equals the ShipDate of any Order: Customers[Order/@OrderDate=Order/@ShipDate]. Some XPATH expressions that might contain characters with special meanings in XML (for example, <, >, &, , ) must be written as escape sequences in the XPATH expressions (for example, < for less than, > for greater than, & for ampersand, &apos for apostrophe, and " for quotation mark).
Quick Check
What is the result of executing an XML view The result of executing an XML view is an XML fragment.
Quick Check Answer
Querying Annotated XML Schemas and XML Views from .NET
SQLXML provides a managed API to execute queries against annotated XML schemas and XML views. Following the same object model as the ADO.NET classes, the API provides Command, DataAdapter, and Parameter classes that specialize in querying annotated XSD schemas. The SQLXML API is defined inside the Microsoft.Data.SqlXml dynamic-link library (DLL).
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