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This lesson begins by providing a general definition for a Web service. After walking through the steps for creating a Web service project in Visual Studio, this lesson explores the basics of what constitutes a Web service application. This includes one or more public methods that are exposed with the WebMethod attribute. The methods are wrapped inside a class file that is distinguished with a WebService declaration. First, however, this lesson just focuses on creating the Web service project and config uring the Web service with the WebService attribute.

In this exercise, you create two stored procedures to compare the processing efficiency of a set-oriented routine and a cursor-based routine.

After this lesson, you will be able to:

CustomersTable.Rows.Add(CustRow)

Answer what a Web service is and why it is important to know how to create one. Create a Web service project using the project template provided in Visual Studio. Identify the code necessary to configure a Web service using the WebService attribute.

1. 2.

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A Web service is a piece of software that is used to expose data and functionality in a distributed environment. The data exposed can be as simple as a list of product cate gories or as complex as a multileveled dataset containing a complete customer pur chase history. The functionality exposed can also range in complexity, and generally complex tasks are broken down into a series of exposed public Web methods. Web services are XML based, and distributed applications access them over the Inter net using a communications protocol such as Simple Object Access Protocol (SOAP). SOAP provides a standard and simple way to present messages in an XML format. SOAP also allows developers to describe what the service does and make it available to other applications. Because the data returned by a Web service is in the form of a stan dardized XML message, applications residing on different platforms can access the same Web services. This capability makes Web services quite useful when multiple cli ents located over vast geographical areas need access to the same kind of information.

DataRow CustRow = CustomersTable.NewRow();

Open a new query window and change the context to the AdventureWorks database. In the existing query window, type, highlight, and execute the following code to create a cursor-based stored procedure to modify all the employee hire dates:

When selecting a distributed application method, first consider Web services because Web services are highly interoperable and accessible from almost any platform.

1

CREATE PROCEDURE HumanResources.UpdateAllEmployeeHireDateInefficiently AS BEGIN TRY SET XACT_ABORT ON

You can think of a Web service application in the same way that you think of a regular ASP.NET application. The primary difference between a Web service application and an ASP.NET application is the interface. ASP.NET applications utilize traditional graphical user interface (GUI) elements, such as text boxes and labels. An XML Web service application has none of these elements. Instead, it relies on help pages and dis covery files to interface with its users. The user of a Web service is typically another application, so no traditional user interface is necessary. Web services are especially useful for applications that must expose key pieces of their data or functionality to outside and unknown sources. For instance, a retail company can utilize a complex application to manage sales and inventory. There is likely a need for outside vendors to access inventory levels specific to the products they provide. The retail company could expose a Web service method that allowed specific vendors to access this information in the form of an XML dataset. The retail company would not need to provide an interface specific to each vendor s operating platform. Instead, they would only be responsible for exposing one Web service method that all vendors could utilize.

Object[] CustRecord = {"ALFKI", "Alfreds Futterkiste", "Maria Anders",

To create a Web service project, you need to create a project using the Web service template in Visual Studio 2005. Using the template adds certain files and directories to your project by default. This makes it easier to get started on building your first Web service. Figure 1-1 shows the New Web Site dialog box that is displayed when you cre ate a new ASP.NET Web service project.

DECLARE curemployee CURSOR FOR SELECT EmployeeID FROM HumanResources.Employee OPEN curemployee FETCH FROM curemployee

Figure 1-1

"Sales Representative", "Obere Str. 57", "Berlin",

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