how to generate barcode in c# CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream in Visual C#.NET

Paint QR in Visual C#.NET CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream

276 CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
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Here is an example that removes the schema from the column and then reattaches it:
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ALTER TABLE Test.Person ALTER COLUMN FavoriteBookTypedXml XML NULL; GO
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ALTER TABLE Test.Person ALTER COLUMN FavoriteBookTypedXml XML(DOCUMENT BooksSchemaCollection) NULL;
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Working with XML Stored in an XML Variable or Column
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When you have data stored using an XML data type, you want to both query and modify it. This is performed using a few methods provided by the XML data type.
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THE EXIST METHOD
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The exist method returns a bit value and is used to verify if an XPath expression is found within an XML instance. The following example shows a simple query against the Demographics column that uses the exist method to find all surveys with a value for TotalPurchaseYTD greater than 5,000. It also uses the xs:decimal XPath function to convert the element to a decimal value. (Note that this conversion is not necessary when using typed XML because SQL Server derives from the XML schema that the element is in fact a decimal.)
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WITH XMLNAMESPACES(DEFAULT 'http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/IndividualSurvey') SELECT COUNT(*) FROM Sales.Individual WHERE Demographics.exist( '/IndividualSurvey/TotalPurchaseYTD[xs:decimal(.) > 5000]') = 1;
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THE VALUE METHOD
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The value method is used to perform an XQuery against the XML instance to fetch a single scalar value from it. In this example, the XPath aggregate function count is used to calculate the number of IndividualSurvey elements in the XML column Demographics, and then the SQL aggregate function SUM is used to summarize the counts returned by the value method:
WITH XMLNAMESPACES(DEFAULT 'http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/IndividualSurvey') SELECT SUM(Demographics.value('count(/IndividualSurvey)', 'INT')) AS NumberOfIndividualSurveys FROM Sales.Individual;
Here is the result:
NumberOfIndividualSurveys -------------------------18484
Lesson 1: Working with XML
Note that the second argument of the value method indicates which SQL data type the value retrieved from the XML document should be converted to in the result.
THE NODES METHOD
The nodes method is used to shred the XML into a tabular form. In the following example, each Order element found is returned as a separate row in the query result. In addition to using the nodes method, the code also uses the value method to retrieve specific values from the XML document into the resulting columns. Note that this method can be used with an INSERT. . .SELECT or an UPDATE statement to pass multiple values to SQL Server in a single parameter:
DECLARE @Orders XML; SET @Orders = N' <Orders> <Order Product="Bike" Quantity="1"/> <Order Product="Bike" Quantity="2"/> <Order Product="Car" Quantity="4"/> </Orders>';
SELECT tab.col.value('@Product', 'NVARCHAR(50)') AS Product ,tab.col.value('@Quantity', 'INT') AS Quantity ,tab.col.value('count(../Order)', 'INT') AS TotalNumberOfOrders FROM @Orders.nodes('/Orders/Order[xs:integer(@Quantity) > 1]') AS tab(col);
Here is the result:
Product Quantity TotalNumberOfOrders -------- ----------- ------------------Bike Car 2 4 3 3
Notice the use of the count function and the parent path (..) used to create the TotalNumberOfOrders column. This can be very useful, but be aware that using parent paths in a value method call on a nodes method result can degrade performance significantly.
THE QUERY METHOD
The query method is used to perform an XQuery against the XML instance to retrieve an XML fragment rather than a scalar value or a tabular result. In the query method, you use the XQuery language s FLWOR expressions to retrieve the parts of the XML document that you need and present it in the way you want. XQuery FLWOR expressions can actually be used in other XML data type methods as well, but it is typically used in the context of the query method. A FLWOR expression consists of the for, let, return, order by, and where keywords, where for is roughly equal to FROM in SQL, let is roughly equal to a common table expression (CTE) declaration, return is roughly equal to SELECT in SQL, and order by and where are equal to their SQL namesakes.
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
The following example uses a FLWOR expression to return all orders of a quantity of two or more from the XML document, sorted with the greatest quantity being returned first and the actual XML elements being translated to Swedish:
DECLARE @Orders XML; SET @Orders = N' <Orders> <Order Product="Bike" Quantity="1"/> <Order Product="Bike" Quantity="2"/> <Order Product="Car" Quantity="4"/> </Orders>';
SELECT @Orders.query(' <Best llningar> { for $o in /Orders/Order where xs:decimal($o/@Quantity) >= 2 order by xs:decimal($o/@Quantity) descending return <Best llning Produkt="{data($o/@Product)}" Antal="{data($o/@Quantity)}"/> } </Best llningar> ');
Here is the result:
<Best llningar> <Best llning Produkt="Car" Antal="4" /> <Best llning Produkt="Bike" Antal="2" /> </Best llningar>
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