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Lesson Summary
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XML can be generated using a SELECT statement in four different modes: FOR XML RAW, FOR XML AUTO, FOR XML PATH, and FOR XML EXPLICIT. FOR XML PATH is typically the preferred mode used to generate XML. The XML data type can be either typed (validated by an XML schema collection) or untyped. In an untyped XML data type, all values are always interpreted as strings. You can use the value, query, exist, nodes, and modify methods to query and alter instances of the XML data type.
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Pr actice
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Using XML
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In this practice, you use both a FOR XML PATH mode query to return an XML result set from SQL Server and a combination of the nodes and value methods to insert rows into a table based on an XML parameter passed to a stored procedure.
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Lesson 1: Working with XML CHAPTER 7 279
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e xercise 1
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Use FOR XML PATH
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In this exercise, you query the Production.Product, Sales.SalesOrderHeader, and Sales.SalesOrderDetail tables to create an XML document.
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1. 2.
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Open Microsoft SQL Server Management Studio (SSMS) and connect to the appropriate instance of SQL Server 2008. In a new query window, execute a SQL query against the AdventureWorks database that produces the following XML document for ProductID = 707:
<Product Id="707"> <Info Name="Sport-100 Helmet, Red" ListPrice="34.9900" /> <Order Id="43665" Date="2001-07-01T00:00:00" CustomerId="146" /> <Order Id="43668" Date="2001-07-01T00:00:00" CustomerId="514" /> <Order Id="43673" Date="2001-07-01T00:00:00" CustomerId="618" /> <Order Id="43677" Date="2001-07-01T00:00:00" CustomerId="679" /> ... </Product>
Here are the correct statements but don t look at them before you have tried to create the query yourself. Type, highlight, and execute the following:
USE AdventureWorks; GO
SELECT p.ProductID AS "@Id" ,p.Name AS "Info/@Name" ,p.ListPrice AS "Info/@ListPrice" ,( SELECT DISTINCT soh.SalesOrderID AS "@Id" ,soh.OrderDate AS "@Date" ,soh.CustomerID AS "@CustomerId" FROM Sales.SalesOrderHeader AS soh INNER JOIN Sales.SalesOrderDetail AS sod ON sod.SalesOrderID = soh.SalesOrderID WHERE sod.ProductID = p.ProductID FOR XML PATH('Order'), TYPE ) FROM Production.Product AS p WHERE p.ProductID = 707 FOR XML PATH('Product');
e xercise 2
Use the nodes and value Methods
In this exercise, you create a stored procedure that accepts an XML data type as its parameter. The stored procedure shreds the XML document into tabular form using the nodes and value methods and then inserts the results into a table.
280 CHAPTER 7 Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
1. 2.
If necessary, open SSMS and connect to the appropriate instance of SQL Server 2008. In the query window, type, highlight, and execute the following SQL statements to create a new table and schema in the AdventureWorks database:
USE AdventureWorks; GO
CREATE SCHEMA TestXml; GO
CREATE TABLE TestXml.Messages ( MessageId INT IDENTITY PRIMARY KEY ,FromUser NVARCHAR(50) NOT NULL ,Message NVARCHAR(max) NOT NULL ,CreatedDateTime DATETIME2 NOT NULL DEFAULT SYSDATETIME() );
In the existing query window, type, highlight, and execute the following SQL statements to create the stored procedure that populates the TestXml.Messages table from an XML document:
CREATE PROCEDURE TestXml.spMessageInsertMultiple @Messages XML AS BEGIN SET NOCOUNT ON;
INSERT TestXml.Messages (FromUser, Message) SELECT tab.col.value('@FromUser', 'NVARCHAR(50)') ,tab.col.value('text()[1]', 'NVARCHAR(max)') FROM @Messages.nodes('/Messages/Message') AS tab(col); END
Finally, in the existing query window, type, highlight, and execute the following SQL statements to run the stored procedure (adding two messages to the table) and then query the table to see the results:
EXEC TestXml.spMessageInsertMultiple @Messages = N' <Messages> <Message FromUser="Jeff Low">Hi, how are you </Message> <Message FromUser="Jane Dow">Not bad, and yourself </Message> </Messages>';
SELECT * FROM TestXml.Messages;
Lesson 1: Working with XML
The result returned by the query should look like this:
MessageId --------1 2 FromUser -------Jeff Low Jane Dow Message -------------------Hi, how are you Not bad, and yourself CreatedDateTime ---------------------2008-11-05 12:40:56.14 2008-11-05 12:40:56.14
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
Lesson 2: Using SQLcLR and Filestream
Let s begin this lesson by discussing what SQLCLR is. SQLCLR refers to the use of CLR execution within the SQL Server Database Engine. CLR is also often referred to as the .NET Framework, just .NET, or by the name of the programming language that might be used, such as Visual Basic .NET or C#. The use of CLR within SQL Server is an important aspect of making SQL Server more extensible, allowing developers to do more than what is possible with just the T-SQL language and its system functions. In this lesson, we start by exploring the basics of using CLR within SQL Server, and then cover why you might want to build certain database objects using CLR. Next, we look at how stored procedures, triggers, functions, types, and aggregates can be created using CLR. At the end of this lesson, we look at how you can use Filestream objects to store binary large objects (BLOBs) in SQL Server 2008.
After this lesson, you will be able to:
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