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The data modification must reference exactly one table. Columns in the view must reference columns in a table directly. The column cannot be derived from an aggregate. The column cannot be computed as the result of a UNION/UNION ALL, CROSSJOIN, EXCEPT, or INTERSECT. The column being modified cannot be affected by the DISTINCT, GROUP BY, or HAVING clause. The TOP operator is not used.

' VB Private Sub GetOleDbInfoButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GetOleDbInfoButton.Click MsgBox(ConnectionToOleDb.ServerVersion.ToString, "Server Version")

In the early days of the SOAP specification, Remote Procedure Call (RPC) was the only formatting alternative. This style requires that the Body element fol low a very specific schema and must contain a set of parameters. More than likely the only reason you would need to utilize the RPC style was if you knew you were interfacing to a client that required the RPC style. This is the default style used when creating Web services with Visual Studio. It was introduced as a way to allow for unstructured documents, and it allows for greater flexibility in the way it handles parameters.

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The .NET Framework 2.0 provides an attribute mechanism to alter the formatting of your SOAP messages. This mechanism allows you to specifically control the way the SOAP message will be handled without modifying the message directly. The Sys tem.Web.Services.Protocols namespace includes the SoapDocumentMethodAttribute (see Table 1-3) and SoapRpcMethodAttribute (see Table 1-4) classes, which represent the SoapDocumentMethod and SoapRpcMethod. These methods are used to format SOAP messages; as you can guess, the SoapDocumentMethod is used to format messages using the Document style, and SoapRpcMethod is used to format messages using the RPC style.

If a view does not meet the requirements to be updatable, you can create an INSTEAD OF trigger on the view. The INSTEAD OF trigger executes for the DML operation you are performing instead of sending the DML through the view.

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Because the definition of a view can contain a WHERE clause, it s possible to make a modification through the view that is not visible when you retrieve data from the view. The WITH CHECK OPTION clause requires that the only data manipulation that can occur through the view must also be retrievable when you select from the view.

Sara Morgan I recently did contract work for a company that consumed Web services to access remote data in real time. The data was remote because it was provided by the company s headquarters, which was located in another state within the United States. The local office had no real development staff and relied on con tractors to make changes to some of the local applications they had developed internally. For some reason, the company headquarters decided to use an RPC-encoded style to implement their Web services. This resulted in a tight coupling between the Web service and the client. Every time a developer at the corporate office would make a change to one of the Web method interfaces, the change would cause the local company s application to break. The change could have been a simple one in which a parameter previously defined as a double was changed to be an integer. For RPC-encoded messages, the type is encoded within the mes sage and so a change to the parameter type breaks the contract between the Web service and the client. Every time this problem occurred, which for a period of time was about once a month, the local office would have to call me in to look at the problem. The fix usually just involved getting a new copy of the WSDL from the corporate office, but the fact that the tight coupling caused such problems when changes occurred demonstrated how fragile such a situation can be. This situation dem onstrates that there is no real benefit to using an RPC-encoded style when changes to the interface are possible.

As stated earlier, the SOAP specification allows for two formatting options: Style and Use. The Use attribute relates to Web method parameters and return values. By spec ifying encoding values, you effectively are telling SOAP to attach certain attributes to an XML element so that it can be identified correctly. In this case, it can be set with one of the following two encoding values:

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