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Updategrams have been designed to update SQL Server; DiffGrams are mostly a stateful way to persist the contents of a DataSet object (ADONET DiffGrams are covered in 10) Converting DiffGrams to Updategrams is certainly possible at the schema level, but Updategrams are unquestionably more powerful objects Together with SQLXML 30 and the SQL Server XML extensions, Updategrams let you control concurrency, control the order of updates, perform transactional updates, and specify parameters On the other hand, there is not yet a NET Framework class that works like an Updategram (And SQLXML 30 is still a hybrid, half COM and half managed code) Most of the batch update features you find in Updategrams can be implemented in ADONET using the DataSet object's Update method and the provider-specific data adapter object.

As noted earlier, when you query a SharePoint list, SharePoint automatically redirects the query to the data source. When the query shown in Figure 8-5 runs with redirection enabled (the default setting), it returns the data set in Figure 8-9 to Excel.

Now that the data source has been associated with the main document, you can begin entering text and/or editing your document. You cannot, however, make changes to your data source in Excel. If you need to make changes to the data, you must close the main document in Word before you can open the data source in Excel.

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Nothing comes for free, though, and you must write a lot of code to emulate Updategrams in the NET Framework XML Batch Update In ADONET, as well as in ADO, you can persist the changes made to a set of records stored in memory using a procedure called a batch update This procedure consists of a loop that looks up for changed records in the DataSet object (or the Recordset object in ADO) and issues a command to the back-end database From the programmer's perspective, a batch update is ideal for working in disconnected scenarios and in ADONET although it is not yet perfect, it has been significantly improved and made applicable to real-world usage Thanks to the ADONET XML serialization mechanism (see 9), you can load a DataSet object from XML data, enter the needed changes, and then proceed with the batch update The ADO.

NET DiffGram is one of the possible XML representations for a DataSet object Although, all in all, the Updategram is a more powerful and richer 313.

With redirection disabled, the query can t be redirected to the SharePoint data source for the list. Instead, the query returns data directly from the page, as shown in Figure 8-10.

object for XML-driven updates, an ADO.NET batch update is still an option to consider when you're updating a database starting with XML data. The ADO.NET batch update is a step-by-step procedure implemented through a sequence of individual statements, all running from the client environment. Once again, this is different from Updategrams, in which all data is downloaded to SQL Server and applied as a server-side batch. The closest you can get to this model with ADO.NET is using a datatier component that decouples any middle-tier objects from the database. The middle-tier object applies all the needed changes to the DataSet object and then passes the object on to another component, possibly located on the same machine as SQL Server. The DataSet object is remoted as XML and is rebuilt at the destination. Finally, the changes are applied in batch update mode but through a specialized and scalable datatier component and with a more effective use of the bandwidth.

Figure 8-10. Query results from SharePoint with redirection disabled After you ve edited the query, Excel automatically refreshes the query using the new options and settings.

SQLXML 3.0 comes with a handful of managed classes designed to expose the functionality of SQLXML 3.0 inside the .NET Framework. SQLXML managed classes allow you bring XML data read from SQL Server into .NET Framework applications, process the data, and send any updates back to SQL Server as an ADO.NET DiffGram. The managed classes are exposed by the microsoft.data.sqlxml assembly. SQLXML does not get along perfectly with the .NET Framework data provider for SQL Server. SQLXML needs to address special XML-driven functionalities of SQL Server 2000 that the .NET Framework data provider simply does not support. As a result, the SQL Server .NET Framework provider can handle traditional SQL queries, including FOR XML queries, but it can't execute XML templates (for example, Updategrams) or server-side XPath queries over XML views. For this reason, SQLXML managed classes rely on the SQLXMLOLEDB OLE DB provider for all of the tasks that involve a SQL Server connection. Figure 8-5 illustrates the key role that the SqlXmlCommand class and its ExecuteStream method play in the overall SQLXML 3.0 architecture.

To insert merge fields into your document, click the Insert Merge Fields button on the Mail Merge toolbar. The Insert Merge Field dialog box will appear, as shown in Figure 9-4.

Figure 8-5: SQLXML managed classes go to SQL Server 2000 using the ExecuteStream method of the SqlXmlCommand class and the SQLXMLOLEDB OLE DB provider. The set of SQLXML managed classes consists of two main classes SqlXmlCommand and SqlXmlAdapter plus a few ancillary classes like SqlXmlParameter and SqlXmlException. SqlXmlCommand is the fundamental class used to execute an XMLdriven command against SQL Server. The SqlXmlAdapter class is actually a wrapper for the command that simply exposes the results through a DataSet object. The SqlXmlCommand Class TheSqlXmlCommand class represents any XML command you can send to SQL Server 2000. As mentioned, you should use this class only to issue those XML related commands that the .NET Framework data provider for SQL Server does not natively support. The class reliance on an OLE DB provider makes rather ineffective any kind of abuse from within a .NET Framework application. Do not use SqlXmlCommand to execute a simple FOR XML query, but take it into account when you need to work with Updategrams, server-side XPath queries (assuming that an XPath query makes sense at all in the context of the application), or XML views. SqlXmlCommand Properties The properties available in the SqlXmlCommand class let you configure the query. Unlike most ADO.NET command classes, the SqlXmlCommand class provides a command stream property that applications can use to pass potentially lengthy input data such as Updategrams. Table 8-2 summarizes the properties of the SqlXmlCommand class. 315

If you include web pages of data on your SharePoint site that weren t created using SharePoint web parts, you can build redirection into your pages and tables the same way SharePoint does. There are two steps to redirection: 1. In the opening HTML tag of your web page, include the following Microsoft Office namespace declaration:

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