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The cause of the difference in the execution order is the introduction of the TOP clause (in SQL Server 7.0), which is not part of the ANSI/ISO SQL standard. The standard-compliant behavior of the UNION clause allows only one ORDER BY clause, which must be placed in the last SELECT statement of the query and must sort the entire query result. This means the TOP clause in any but the final SELECT statement of a UNION query returns the top X items before they are sorted. This may sound like a minor point, but it is important to be aware of. For example, compare the result of two queries, both of which are intended to return the two most expensive red products and the two most expensive black products. The first query, shown here, produces an incorrect result:

TruckGround=1,

this.customersTableAdapter.Fill(this.northwindDataSet.Customers);

Express=2,

USE AdventureWorks;

OverseasDeluxe=3,

OvernightFast=4,

DataColumn Location = new DataColumn("Location");

SELECT TOP(2) ProductID, Name, Color, ListPrice FROM Production.Product WHERE Color = 'Black' UNION SELECT TOP(2) ProductID, Name, Color, ListPrice FROM Production.Product WHERE Color = 'Red' ORDER BY ListPrice DESC;

2

The first line of code in this class inherits from the SoapHeader class. The class also contains an enumeration variable named ShipMethods. This variable includes any potential values to which our SOAP header variable could be set. The next step is to reference the VendorHeader class as a public member variable within the Web service class file:

Here is the (incorrect) result of this first query:

Location.Expression = "City + ', ' + Country";

'VB Public ShipMethod As VendorHeader //C# public VendorHeader ShipMethod;

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ProductID Name Color ListPrice ----------- ------------------------- ----- ---------706 707 317 318 HL Road Frame - Red, 58 Sport-100 Helmet, Red LL Crankarm ML Crankarm Red Red 1431,50 34,99

The WebMethod declaration for the newly created GetPurchaseTotal Web method will contain the SoapHeader attribute. This is where you associate the new Web method with the custom SOAP header class created earlier. The code representing this decla ration is as follows:

northwindDataSet.Customers.Columns.Add(Location);

'VB <WebMethod(Description:="Retrieve Summed Purchase information for " + _ "a specific vendor within a certain time range. Also the Shipment Method " + _ "will be considered as an optional parameter passed through the SOAP header"), _ SoapHeader("ShipMethod", Direction:=SoapHeaderDirection.InOut)> Public Function GetPurchasingTotal(ByVal VendorID As Integer, ByVal StartDate As DateTime, _ ByVal EndDate As DateTime) As String //C# [WebMethod(Description = "Retrieve Summed Purchase information for " + "a specific vendor within a certain time range. Also the Shipment Method " + "will be considered as an optional parameter passed through the SOAP header"), SoapHeader("ShipMethod", Direction=SoapHeaderDirection.InOut)] public string GetPurchaseTotal(int vendorID, DateTime startDate,

Black 0,00 Black 0,00

DateTime endDate)

} private void AddColumnButton_Click(object sender, EventArgs e) { DataGridViewTextBoxColumn LocationColumn = new DataGridViewTextBoxColumn(); LocationColumn.Name = "LocationColumn"; LocationColumn.HeaderText = "Location"; LocationColumn.DataPropertyName = "Location"; customersDataGridView.Columns.Add(LocationColumn); }

The SoapHeader attribute is used to specify the contents of the optional SOAP Header element. The first parameter, ShipMethod, is the member name for the header. This parameter should be set to the same name as the variable defined in the class. The second item specified in the SoapHeader is the named parameter, Direction. The Direction property is used to specify whether the SOAP header is intended for the Web service, the Web service client, or both. The property accepts one of the following four values:

The second query, shown here, generates the intended result:

Used to specify that the header applies only to the Web service. This value is the default for this property. Used to specify that the header applies only to the Web service client.

USE AdventureWorks;

Used to specify that the SOAP header applies to both the Web service and the Web service client. Used to specify that the SOAP header is sent to the client when the Web service throws an exception.

11. Double-click the Delete Column Button to create the DeleteColumnButton_Click event handler. Add the following code to the DeleteColumnButton_Click event handler:

The code inside the GetPurchasingTotal Web method can access the shipment method through the ShipMethod variable that was declared in the class file. The code to refer ence this public variable and set a default for the shipment method if one is not passed in by the client would appear as follows:

WITH a AS ( SELECT TOP(2) ProductID, Name, Color, ListPrice FROM Production.Product WHERE Color = 'Black' ORDER BY ListPrice DESC ), b AS ( SELECT TOP(2) ProductID, Name, Color, ListPrice FROM Production.Product WHERE Color = 'Red' ORDER BY ListPrice DESC ) SELECT * FROM a UNION ALL SELECT * FROM b;

'VB If ShipMethod Is Nothing Then ShipMethod = New VendorHeader() ShipMethod.ShipMethod = VendorHeader.ShipMethods.CargoTransport End If //C# if (ShipMethod == null) { ShipMethod = new VendorHeader(); ShipMethod.ShipMethod = VendorHeader.ShipMethods.CargoTransport; }

CustomersDataGridView.Columns.Remove("LocationColumn")

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