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Figure 10-3 : The page that lets you test the HelloWorld method for the Simple XML Web service The single parameter, Language, can be entered in the text box above the Invoke button. If you didn t remember that Language was a string, you could refer to the SOAP request detailed on the same page, and you d know that it s expecting a string. If you enter Spanish in the Language text box and click Invoke, a page such as the one shown in Figure 10-4 will appear.

techniques require a unique identifier in the table. In SQL Server 2005, you can use a CTE and the ROW_NUMBER function to generate a fast solution without these shortcomings: WITH Dups AS ( SELECT *, ROW_NUMBER() OVER(PARTITION BY OrderID ORDER BY OrderID) AS rn FROM dbo.OrdersDups ) DELETE FROM Dups WHERE rn > 1;

The query defining the CTE Dups generates row numbers starting with 1 for each partition of rows with the same OrderID, meaning that each set of rows with the same OrderID value will be assigned row numbers starting with 1 independently. Each row number here represents the duplicate number. The ROW_NUMBER function requires you to specify an ORDER BY clause, even when you don't really care how row numbers are assigned within each partition. You can specify the same column you use in the PARTITION BY clause (OrderID) also in the ORDER BY clause. Such an ORDER BY clause will have no effect on the assignment of row numbers within each partition. More importantly, while the row numbering is nondeterministic, there will be exactly one row within each partition with rn equal to 1. Finally, the outer query simply deletes rows that have a duplicate number greater than 1 through the CTE, leaving only one row for each OrderID value. This solution runs for only 1 second on my system; it doesn't require a unique identifier in the table; and it allows you to identify duplicates based on any attribute or attributes that you like.

Figure 10-4 : The results returned by a call to the HelloWorld method with Spanish In Figure 10-4, notice that the URL in the Address bar is nothing more than a path to the .asmx file, along with the parameter, passed exactly as it would be to an ASP.NET Web Forms page. Notice in Figure 10-2 the warning that the XML Web service is using http:// tempuri.org as its namespace. This is the default namespace Visual Studio .NET uses for XML Web services. This namespace is fine for testing XML Web services, but a real XML Web service should point to a different namespace. To change the namespace used by the XML Web service, you need to add a line such as this immediately before the class declaration: <WebService(Namespace:="http://ProgrammingASP.NET/webservices/")> The URL doesn t have to be anything specific, nor does it actually need to exist. Using WebMethod Attribute Properties The WebMethod attribute accepts six properties to control how the XML Web service operates. These properties are described in Table 10-1. Table 10-1 : Properties of the WebMethod Attribute Property BufferResponse Description Enables buffering of responses from the XML Web service. The default value is true, and this is almost always the best setting. If set to false, the response from the XML Web service will be sent to the requesting client in 16-KB blocks. The syntax for setting this parameter is shown here: [Visual Basic.NET] <WebMethod(BufferResponse:=False)> [C#]

The Windows Azure technology platform enables you to deploy role instances to data centers in different geographic locations.

T-SQL supports a proprietary syntax for DELETE and UPDATE based on joins. Here I'll cover DELETEs based on joins, and later, in the UPDATE section, I'll cover UPDATEs based on joins.

This syntax is not standard and should be avoided unless there's a compelling benefit over the standard syntax, as I will describe in this section.

Table 10-1 : Properties of the WebMethod Attribute Property CacheDuration Description [WebMethod(BufferResponse=false)] Enables caching of the results for an XML Web service method ASPNET will cache the results for each unique parameter set The value of this property specifies how long, in seconds, ASPNET will cache the results The default value is 0, meaning that nothing is cached This property often should be set, especially if the number of unique sets of parameters is limited and the underlying response will likely not change frequently The syntax for setting this property is shown here: [Visual BasicNET] <WebMethod(CacheDuration:=60)> [C#] [WebMethod(CacheDuration=60)] Supplies a description for an XML Web service method that will appear on the Service help page The syntax for setting this property is shown here: [Visual BasicNET] <WebMethod(Description:="Text")> [C#] [WebMethod(Description="Text")] Enables session state for an XML Web service method.

I'll first describe the syntax, and then show examples where it provides functionality not available with standard syntax. You write a DELETE based on a join in a similar manner to writing a SELECT based on a join. You substitute the SELECT clause with a DELETE FROM <target_table>, where <target_table> is the table from which you want to delete rows. Note that you should specify the table alias if one was provided. The typical use of this feature is to make it easier to delete rows that meet an EXISTS or NOT EXISTS condition, to avoid having to specify a subquery for the matching condition twice. Some people also