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A search argument (SARG) is a filter expression that is used to limit the number of rows returned by a query and that can use an index seek operation that substantially improves the performance of the query. Typically, a filter expression is not a SARG if the column from the table is used in an expression (such as LEFT(Name, 1) = 'A'). If the filter is not a SARG and no other SARGs exist in the query, this results in an index or table scan, which iterates through the entire index or table. Instead of a scan, you want a seek operation to be performed. A seek implies the use of the index s balanced tree to find the values for which the query searched. The use of a balanced tree significantly decreases the work that SQL Server needs to perform to find a row. The difference between a seek and a scan can be orders of magnitude. For example, in the following query, SQL Server scans the OrderDateIndex index (rather than seeking through it). The execution plan for the following query, which you can view by pressing Ctrl+M in SQL Server Management Studio (SSMS), is shown in Figure 6-1:

Lesson 3 in 1 presented ways to test and consume your Web services. One way is to create a client application that consumes Web methods from your Web ser vice. To do this, you need to add a new ASP.NET project and set a Web reference to the Web service in your solution. You can then add code to the code-behind file for the Web page named default.aspx. After Visual Studio creates the Web reference in your client project, you can add code that instantiates a new object representing the VendorHeader class and then set the value for the ShipMethod property, as shown in the following code:

'VB Dim wsHeader As New MyWebService.VendorHeader wsHeader.ShipMethod = MyWebService.ShipMethods.TruckGround //C# MyWebService wsHeader = new MyWebService.VendorHeader(); wsHeader.ShipMethod = MyWebService.ShipMethods.TruckGround;

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13. Drag a label onto the form and place it next to the GetClickedCell button. 14. Double-click the GetClickedCell button and add the following code to the GetClickedCellButton_Click event handler:

USE AdventureWorks;

Now that you ve referenced the custom SOAP header class and set the property, you can instantiate an object that points to the Web service. Next, you associate the header object you just created with the header for the Web service, as shown in the following code:

'VB Dim ws As New MyWebService.MyWebService ws.VendorHeaderValue = wsHeader //C# MyWebService ws = new MyWebService.MyWebService(); ws.VendorHeaderValue = wsHeader();

CREATE NONCLUSTERED INDEX OrderDateIndex ON Sales.SalesOrderHeader (OrderDate);

' VB Dim CurrentCellInfo As String CurrentCellInfo = CustomersDataGridView.CurrentCell.Value.ToString & Environment.NewLine CurrentCellInfo += "Column: " & CustomersDataGridView.CurrentCell.OwningColumn.DataPropertyName & Environment.NewLine CurrentCellInfo += "Column Index: " & CustomersDataGridView.CurrentCell.ColumnIndex.ToString & Environment.NewLine CurrentCellInfo += "Row Index: " & CustomersDataGridView.CurrentCell.RowIndex.ToString Label1.Text = CurrentCellInfo // C# string CurrentCellInfo;

The final step in passing a custom SOAP header is to invoke the Web method for your Web service. The Web method GetPurchasingTotal accepts values passed in through parameters as well as the shipment method passed through the optional SOAP header. The last bit of code needed to call your Web method and display the results to a form on the default.aspx Web page is as follows:

'VB Dim ret As String ret = ws.GetPurchasingTotal(1, "09/01/03", "09/30/03") lblDisplay.Text = ret //C# string ret;

SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE YEAR(OrderDate) = 2004;

ret = ws.GetPurchasingTotal(1, "09/01/03", "09/30/03");

Environment.NewLine;

If the query instead is rewritten so that the OrderDate column is not used in an expression, an index seek operation can be used instead of a scan. The execution plan for the following query is shown in Figure 6-2.

lblDisplay.Text = ret;

2

customersDataGridView.CurrentCell.OwningColumn.DataPropertyName + Environment.NewLine;

SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE OrderDate >= '20040101' AND OrderDate < '20050101';

In the previous example, we knew that the SOAP header contained a property that allowed us to pass in the optional shipment method. There might be cases where the Web service client does not know specifically what to pass in the SOAP header. For tunately, there is a way to declare a SOAP header as unknown. The SOAP specification allows you to set an attribute named mustUnderstand when passing a request from the client to the Web server. By setting this property to true as shown in the following code (the default is false), you indicate that a Web service should throw an exception if it receives a SOAP header it does not understand:

'VB wsHeader.MustUnderstand = True //C# wsHeader.MustUnderstand = true;

Note that the use of the COLLATE operator in a filter expression also invalidates the use of an index on that column. You learn about this in more detail in Lesson 2, Creating Indexes.

customersDataGridView.CurrentCell.ColumnIndex.ToString() + Environment.NewLine;

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