visual basic barcode Retrieving all element names and values from XML in C#

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Listing 17 Retrieving all element names and values from XML
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DECLARE @x xml = N' <Companies xmlns:info = "urn:corp:info" xmlns:address = "urn:corp:address"> <info:Company> <info:Ticker>MSFT</info:Ticker> <info:Name>Microsoft Corporation</info:Name> <address:Address>One Microsoft Way, Redmond, WA</address:Address> </info:Company>
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Advanced query topics
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<info:Company> <info:Ticker>IBM</info:Ticker> <info:Name>International Business Machines</info:Name> <address:Address>1 New Orchard Road, Armonk, NY</address:Address> </info:Company> </Companies>'; SELECT CASE NodeUri WHEN N'' THEN N'' ELSE N'{' + NodeUri + N'}' END + NodeName AS [Name], NodeUri, NodeName, NodeValue FROM ( SELECT node.value(N'fn:namespace-uri(.[1])', N'nvarchar(1000)') AS NodeUri, node.value(N'fn:local-name(.[1])', N'nvarchar(1000)') AS NodeName, node.query(N'./text()') AS NodeValue FROM @x.nodes(N'//*') T(node) ) sub;
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Retrieving all element names and nodes from an XML document
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This sample query takes advantage of the XQuery wildcard character to match every node in the XML data, regardless of location or XML namespace. We also use the XQuery fn:namespace-uri and fn:local-name functions to retrieve the XML namespace URI and local name for every element found.
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XML automatically expands XML namespace prefixes (internally) to their matching namespace URIs whenever it encounters them in your XML data. To represent this, we ve included a column that shows the fully expanded element names in the results. This column looks like this: {urn:corp:info}Company.
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How do I load XML documents from the filesystem
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The OPENROWSET function has a BULK option that allows you to load data into SQL Server directly from the filesystem. Using this option, you can load a single file from
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SQL Server XML frequently asked questions
the filesystem directly into a variable or column in a table. For our example, we will assume an XML file named state-list.xml exists in the root directory of your C: drive. This file looks something like listing 18.
Listing 18 Sample state-list.xml file
< xml version="1.0" > <capitals> <state name="Alabama" abbreviation="AL" capital="Montgomery" flag="AL.gif" date="December 14, 1819" fact="Rosa Parks refused to give up her seat on a Montgomery bus in 1955. The Montgomery Bus Boycott kicked off the Civil Rights era a few days later." address="600 Dexter Ave" zip="36130" long="-86.301963" lat="32.377189" /> <state name="Alaska" abbreviation="AK" capital="Juneau" flag="AK.gif" date="January 3, 1959" fact="In 1867 United States Secretary of State William H. Seward offered Russia $7,200,000, or two cents per acre, for Alaska." address="120 4th Street" zip="99801" long="-134.410699" lat="58.301072" /> ... </capitals>
You can use the OPENROWSET function with BULK option to load this XML file from the filesystem into an xml variable, as shown in listing 19. Partial results are shown in figure 10.
Listing 19 Loading XML data from the filesystem
DECLARE @xml XML; -- Use OPENROWSET to read an XML file from the filesystem SELECT @xml = BulkColumn FROM OPENROWSET(BULK 'c:\state-list.xml', SINGLE_BLOB) TempXML -- View the result SELECT @xml;
Summary
XML file loaded from filesystem into SQL Server
A few things you need to keep in mind with this method: The SQL Server service must have access to the drive, directory, and file you are trying to load. The source file name must be a string literal. You can t replace it with a variable name. If you want to use a variable name, you ll have to use this method with dynamic SQL. We used the SINGLE_BLOB option in this example it is the preferred method, because SINGLE_BLOB supports all Windows encoding conversions. You can also use SINGLE_CLOB for character files or SINGLE_NCLOB for national character (Unicode) files.
Summary
This concludes my answers to some of the most frequently asked questions about SQL Server XML. SQL Server provides powerful XML functionality, especially with the introduction of the xml data type in SQL Server 2005. Now that SQL Server supports XQuery via the xml data type methods, improved FOR XML capabilities, and additional improved support for XML via SQL CLR and other functions, you can easily query, manipulate, modify, and process XML server-side.
About the author
Michael Coles is a SQL Server MVP and consultant based in New York City. Michael has written several articles and books on a wide variety of SQL Server topics, including Pro SQL Server 2008 XML and the Pro T-SQL 2008 Programmer s Guide. He can be reached at http:/ /www.sergeantsql.com.
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