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This mode is far more powerful than both the RAW and AUTO modes because it allows you to add both attributes and subelements to the output, as well as including other types of XML constructs. The PATH mode is also far simpler to use and easier to read than a query that uses EXPLICIT mode.

sqlString += "AND ShipMethodID = @ShipMethodID ";

If XmlReader has been positioned on an attribute, you can use ReadInnerXml and ReadOuterXml to return strings based on the attribute content. For example, consider the following XML fragment:

sqlString += "FOR XML AUTO ";

Query data by using SELECT statements. Implement aggregate queries. Combine datasets. Apply built-in scalar functions.

SqlCommand command = new SqlCommand(sqlString, sqlConn);

If the XmlReader is positioned on the length attribute, ReadInnerXml returns the fol lowing string:

SqlParameter param1 = new SqlParameter("@VendorID", vendorID);

Lessons in this chapter:

command.Parameters.Add(param1);

12 19

SqlParameter param2 = new SqlParameter("@StartDate", startDate);

and does not advance the position of the reader. Likewise, given the same fragment and starting position, ReadOuterXml returns the following string:

command.Parameters.Add(param2);

Lesson 3: Implementing Aggregate Queries Lesson 4: Combining Datasets 30 Lesson 5: Applying Built-in Scalar Functions

SqlParameter param3 = new SqlParameter("@EndDate", endDate);

length="12"

command.Parameters.Add(param3);

To complete the lessons in this chapter, you must have:

if (ShipMethod != null)

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You can use the MoveToContent method to skip over nodes that do not contain con tent, such as white space, comments, or processing instructions. The MoveToContent method checks to see if the current node is a content node. If it is, no action is taken. If the current node is not a content node, it moves the position of the reader to the next content-containing node. MoveToContent considers the following node types to be content nodes: CDATA, Element, EndElement, EntityReference, EndEntity, or any nonwhite space text. When MoveToContent is called, the reader will stop at the first of any of these nodes that it encounters. It will skip over any of the following types of nodes: ProcessingInstruction, DocumentType, Comment, Whitespace, or SignificantWhitespace. The following demonstrates how to call MoveToContent:

SqlParameter param4 = new SqlParameter("@ShipMethodID",

A basic understanding of SQL Server data types A basic understanding of relational database concepts A basic understanding of object and schema naming standards, including multi-part names such as Schema.Table

ShipMethod.ShipMethod);

A general understanding of SQL programming concepts, such as batches, scripts, looping, and remarks. Knowledge about how to open and execute queries in SQL Server Management Studio (SSMS). Microsoft SQL Server 2008 Developer, Enterprise, or Enterprise Evaluation, with the AdventureWorks2008, AdventureWorksDW2008, and Northwind sample databases installed. You can download the AdventureWorks2008 and AdventureWorksDW2008 from the Codeplex Web site at http://www.codeplex.com/ MSFTDBProdSamples/ Release/ProjectReleases.aspx ReleaseId=18407. The Northwind database can currently be found at http://www.microsoft.com/downloads/details .aspx FamilyID=06616212-0356-46A0-8DA2-EEBC53A68034&displaylang=en. For Northwind, the .msi file will simply extract the files to your hard drive. Use SSMS to attach the Northwind database.

' VB ' Assumes an XmlReader named myReader myReader.MoveToContent() // C# // Assumes an XmlReader named myReader myReader.MoveToContent();

command.Parameters.Add(param4);

rdr = command.ExecuteXmlReader();

Unless otherwise specified, the samples and practices in this chapter refer to the AdventureWorks2008 database.

rdr.Read();

9

while (rdr.ReadState != System.Xml.ReadState.EndOfFile)

The primary function of a database is to store data and provide access to that data. In the SQL programming language, the SELECT statement provides the data retrieval functionality.

ret += rdr.ReadOuterXml();

Calling the Skip method causes XmlReader to skip all of the child nodes of the current node and proceed to the next node at the same level. For example, consider the fol lowing XML fragment:

After this lesson, you will be able to:

sqlConn.Close(); rdr.Close();

catch (Exception ex)

The most basic SELECT statement must include at least a SELECT clause and a FROM clause. The most basic SELECT statement retrieves all columns and all rows from a table. The following code sample retrieves all rows and columns from the Employee table in the HumanResources schema.

If the reader is positioned on <text1> and the Skip method is called, the reader is advanced to the <text3> node. The following example demonstrates the use of the Skip method:

return ret;

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