qr code generator c# Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream in C#.NET

Make QR Code in C#.NET Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream

Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
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Lesson 1: Working with XML
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XML is a hierarchical text markup language, easily readable by human beings, that is typically used for data exchange within and between systems. Because XML itself is such a big topic, it can t be covered within the scope of this book. A basic understanding of XML is a prerequisite for this lesson.
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Unless otherwise stated, all examples shown in this lesson use the AdventureWorks sample database for SQL Server 2008.
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For reference, a simple example of an XML document containing two customers (denoted by the <Customer> tag), each with a few orders (denoted by the <Order> tag), is shown here:
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< xml version="1.0" > <Customers> <Customer Id="1" AccountNumber="AW00000001" Type="S"> <Orders> <Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00:00:00" /> <Order Id="44501" OrderDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00" /> <Order Id="45283" OrderDate="2002-02-01T00:00:00" ShipDate="2002-02-08T00:00:00" /> <Order Id="46042" OrderDate="2002-05-01T00:00:00" ShipDate="2002-05-08T00:00:00" /> </Orders> </Customer> <Customer Id="2" AccountNumber="AW00000002" Type="S"> <Orders> <Order Id="46976" OrderDate="2002-08-01T00:00:00" ShipDate="2002-08-08T00:00:00" /> <Order Id="47997" OrderDate="2002-11-01T00:00:00" ShipDate="2002-11-08T00:00:00" /> <Order Id="49054" OrderDate="2003-02-01T00:00:00" ShipDate="2003-02-08T00:00:00" /> <Order Id="50216" OrderDate="2003-05-01T00:00:00" ShipDate="2003-05-08T00:00:00" /> <Order Id="51728" OrderDate="2003-08-01T00:00:00" ShipDate="2003-08-08T00:00:00" /> <Order Id="57044" OrderDate="2003-11-01T00:00:00" ShipDate="2003-11-08T00:00:00" /> <Order Id="63198" OrderDate="2004-02-01T00:00:00" ShipDate="2004-02-08T00:00:00" /> <Order Id="69488" OrderDate="2004-05-01T00:00:00" ShipDate="2004-05-08T00:00:00" /> </Orders> </Customer> </Customers>
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As mentioned, the previous code sample is an XML document. In this lesson, XML fragments also are discussed. XML fragments are similar to XML documents; the difference is that they are not in themselves a document. Sound strange The thought is just that an XML fragment is supposed to be part of an XML document, that is, it has been taken out of the context of the document. This means that an XML fragment lacks the XML declaration (< xml. . .>) and does not have to have a root element (such as <Customers> in the previous example). Here is an example of an XML fragment:
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Lesson 1: Working with XML CHAPTER 7 257
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<Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00:00:00" /> <Order Id="44501" OrderDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00" /> <Order Id="45283" OrderDate="2002-02-01T00:00:00" ShipDate="2002-02-08T00:00:00" />
Whether or not to use XML within a relational database system is often debated. As with most features, when and where to use it depends on the problem that you are trying to solve. XML can be used for several actions related to a database. The major uses are listed here:
Retrieving relational data as XML
Instead of retrieving a tabular result set from the database, you retrieve an XML document.
Instead of passing scalar values to the database by issuing multiple data manipulation language (DML) statements or running a stored procedure multiple times, an XML document or fragment can be passed directly to the database.
Passing data as XML to the database Storing and querying an actual XML document or fragment in the database This is one of the more controversial topics. Why would you store XML directly in a table There are several reasons, which are covered later in this lesson.
After this lesson, you will be able to:
Use FOR XML to retrieve relational data as XML from SQL Server. Use the XML data type and its methods to work with XML inside SQL Server.
Estimated lesson time: 60 minutes
Retrieving Tabular Data as XML
To start with, why would you want to retrieve an XML document or fragment from the database instead of a tabular result set One reason might simply be that the person for whom you are retrieving this data wants it as XML. Another reason might simply be that the data you are fetching lends itself better to being described using XML than using a table. This is true for hierarchical data, like the first example in this chapter with customers and their respective orders. If you think about it, it is probably very common for an application to fetch a hierarchy of data like this. If you can t use XML as the data for the format, you have two other options in SQL Server. The first option is to execute two separate SELECT statements and combine the customers with their respective orders in the client application. Note that you need to include the CustomerID in both queries to allow for combining the results in the client:
SELECT c.CustomerID ,c.AccountNumber ,c.CustomerType FROM Sales.Customer AS c WHERE c.CustomerID IN (1, 2);
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