Lesson 2: Retrieving XML Data by Using SQL Server Server-Side Technologies in VS .NET

Make PDF417 in VS .NET Lesson 2: Retrieving XML Data by Using SQL Server Server-Side Technologies

Lesson 2: Retrieving XML Data by Using SQL Server Server-Side Technologies
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The order by clause orders the output sequence of nodes. In this example, the output XML fragment is ordered according to the number of years that the employee has worked for that department, starting from the employee who has worked there the longest to the most recent employee. The return clause declares the structure of the resulting XML sequence as a constant. Dynamic content is created by enclosing the code in curly braces ({code}). By using the variables $dept and $emp, the code is referencing the current node being processed, also known as the context node. A BigDepartment XML element will be created with two XML attributes: employees and averageYears. The employees attribute will contain the number of employees in that department, and the averageYears attribute will contain the average number of years that all the employees combined have worked for the department. Notice the use of the count and avg XQUERY functions. The BigDepartment element contains a nested XML element called SeniorEmployee, which is created with two XML attributes: firstDay and yearsInRole. The firstDay attribute contains the employee s work start date, and the yearsInRole contains the number of years that the employee has worked in that department. The employee ID is created as the SeniorEmployee element s data. By using the data() function, the value of the id attribute is extracted and inserted in the new resulting structure as the node value for the SeniorEmployee element. The result should be similar to this structure:
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<Departments> <BigDepartment employees="179" averageYears="6.89944134078212"> <SeniorEmployee firstDay="1996-07-31T00:00:00" yearsInRole="10">1</SeniorEmployee> </BigDepartment> <BigDepartment employees="12" averageYears="5.83333333333333"> <SeniorEmployee firstDay="1999-03-14T00:00:00" yearsInRole="7">164</SeniorEmployee> </BigDepartment> <BigDepartment employees="10" averageYears="7"> <SeniorEmployee firstDay="1999-01-19T00:00:00" yearsInRole="7">59</SeniorEmployee> </BigDepartment> <BigDepartment employees="10" averageYears="7"> <SeniorEmployee firstDay="1999-01-05T00:00:00" yearsInRole="7">28</SeniorEmployee> </BigDepartment> <BigDepartment employees="18" averageYears="4.44444444444444"> <SeniorEmployee firstDay="2001-02-04T00:00:00" yearsInRole="5">268</SeniorEmployee> </BigDepartment> </Departments>
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Managing XML Data
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Sql:Variable and Sql:Column
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The XQUERY implementation in SQL Server 2005 has been extended to support the scenarios in which the XML data must interact with data coming from outside the XQUERY expression, as Transact-SQL parameters or even with data coming from the relational environment, such as a column value. By using the sql:variable function, you can include outside values coming from Transact-SQL variables inside an XQUERY and XPATH expression. By using the sql:column function, you can include outside values coming from an existing column in a table inside an XQUERY and XPATH expression.
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Using the value() Method
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You use the value() method to execute an XQUERY or an XPATH expression over the XML structure contained inside a column, parameters, or variables of type XML. The difference is that the value() method must return a scalar value. The resulting value of the value method is then converted to a Transact-SQL type. Developers must be careful to write the XQUERY/XPATH expression correctly for it to return a single value. Examples of scalar values in XPATH could be the result of executing a count() function or a predicate specified in an expression to return a single result. The following example is based on the same query shown in the last code example. It returns the value of the name attribute in a Department element and an id attribute with a value of 5 ( Purchasing ); the result is converted to a Transact-SQL nvarchar(max) data type:
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SELECT @EMPLOYEES.value('(/Department[@id=5]/@name)[1]','nvarchar(max)')
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Even if there is a single Department XML element in the XML structure with id with a value of 5, you must specify the [1] predicate. When SQL Server compiles the XPATH expression, the [1] indicates the cardinality of the result of executing such expression, and the value method validates that there is only one result.
Using the exist() Method
You use the exist() method to execute an XQUERY or an XPATH expression on the XML structure contained inside a column, parameters, or variable of type XML. The result of executing the exist() method is a Boolean value of 1 or 0. A 1 is returned
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