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NOTE
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Viewing XML results in SSMS
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If you are using SSMS to execute this sample Transact-SQL code, configure the results pane to show the results in grid view. The XML data will be displayed as a link. When you click this link, the complete XML result will open in an independent window.
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<OldestEmployeeByDepartment> <DepartmentID>1</DepartmentID> <EmployeeID>3</EmployeeID> <StartDate>1997-12-12T00:00:00</StartDate> <DepartmentName>Engineering</DepartmentName> <YearsToDate>9</YearsToDate> </OldestEmployeeByDepartment>
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Lesson 2: Retrieving XML Data by Using SQL Server Server-Side Technologies
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<OldestEmployeeByDepartment> <DepartmentID>1</DepartmentID> <EmployeeID>9</EmployeeID> <StartDate>1998-02-06T00:00:00</StartDate> <DepartmentName>Engineering</DepartmentName> <YearsToDate>8</YearsToDate> </OldestEmployeeByDepartment>
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Using XML RAW
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FOR XML RAW provides limited formatting capabilities, but it is the easiest way to retrieve basic XML structures out of relational representation in SQL Server 2005.
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Here are some important observations to note about XML RAW formatting:
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No root node is provided, so the XML structure is not a well-formed XML document. It represents an XML fragment. All the columns must be formatted in the same way. It is impossible to set some columns as XML attributes and other columns as XML elements. XML RAW generates a one-level hierarchy. Notice that all elements are at the same level. To construct complex nested XML structures, SQL Server supports nested FOR XML queries (explained later in this lesson).
Using FOR XML RAW
MORE INFO
For more information about the settings available to FOR XML RAW, read the topic Using RAW Mode in SQL Server 2005 Books Online. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx.
Using FOR XML AUTO
FOR XML AUTO creates nested XML structures. For each table you specify in the SELECT query, FOR XML AUTO creates a new level in the XML structure. The order for nesting the XML data is based on the column order as you declared it in the SELECT clause. As in XML RAW, the default formatting is attribute-centric. To change the formatting from attribute-centric to element-centric (and create a new element for each column, instead of attributes), specify the ELEMENTS keyword after the XML AUTO clause. With XML AUTO, the XML tags take their names from the table and column names you declare in the SELECT clause.
8
Managing XML Data
Exam Tip If you declared a table by using a four-part name in the FROM clause of the SELECT query, the XML elements will be named with a three-part name when queried from the local computer and with a four-part name when queried from a remote server. In the following code, MyServerName represents the name of a SQL Server instance:
SELECT TOP 2 [Name] FROM MyServerName.AdventureWorks.HumanResources.Department FOR XML AUTO
It returns the following when executed from the local server:
<AdventureWorks.HumanResources.Department Name="Document Control" /> <AdventureWorks.HumanResources.Department Name="Engineering" />
And it returns the following code when executed from a remote server:
<MyServerName.AdventureWorks.HumanResources.Department Name="Document Control" /> <MyServerName.AdventureWorks.HumanResources.Department Name="Engineering" />
To implement a more predictable outcome, use two-part names, or use table aliases in the query.
The following code example uses the same query as the previous example, but instead of XML RAW, it is formatted as XML AUTO:
SELECT Department.[DepartmentID] ,History.[EmployeeID] ,History.[StartDate] ,Department.[Name] AS DepartmentName ,DATEDIFF(year, History.[StartDate], GetDate()) AS YearsToDate FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History WHERE Department.DepartmentID = History.DepartmentID AND History.EndDate IS NULL ORDER BY Department.[DepartmentID], History.[StartDate] FOR XML AUTO, ELEMENTS
A partial result of executing this query is as follows:
<HumanResources.Department> <DepartmentID>1</DepartmentID> <DepartmentName>Engineering</DepartmentName> <History> <EmployeeID>3</EmployeeID> <StartDate>1997-12-12T00:00:00</StartDate> <YearsToDate>9</YearsToDate> </History> <History> <EmployeeID>9</EmployeeID> <StartDate>1998-02-06T00:00:00</StartDate> <YearsToDate>8</YearsToDate> </History> </HumanResources.Department>
Lesson 2: Retrieving XML Data by Using SQL Server Server-Side Technologies
Important observations to note about XML AUTO formatting include the following:
No root node is provided, so the XML structure is not a well-formed XML document. It represents an XML fragment. All the columns must be formatted in the same way. It is impossible to set some columns as XML attributes and other columns as XML elements. XML AUTO generates a new hierarchy level for each table in the SELECT query, constructed in the following order:
The first level in the XML structure is mapped to the table that owns the first column declared on the SELECT query. The second level in the XML structure is mapped to the table that owns the next column declared on the SELECT query, and so on to the other levels. Notice in the previous example that Department.[DepartmentID] is the first column declared. It means that Department elements will be the first level in the XML structure and EmployeeDepartmentHistory will be nested inside the Department elements. If columns are mixed in with the SELECT query, XML AUTO will reorder the XML nodes so that all nodes belonging to the same level are grouped under the same parent node. Notice in the previous example that the Department.[Name] column is declared fourth in the SELECT query, but it appears before History.[EmployeeID] in the XML structure.
FOR XML AUTO does not provide a renaming mechanism the way XML RAW does. XML AUTO uses the table and column names and aliases if present. (See the History nodes in the previous example.) The formatting is applied by row; to construct complex nested XML structures, SQL Server supports nested FOR XML queries (explained later in this lesson).
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