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</before> <after> <Customers customerid="1999" .. /> </after> </sync> <sync> .. </sync> </ROOT> The contents of each <sync> block represent an atomic unit of processing for which the Updategram guarantees a transactional behavior either all the changes take effect or none do You can use different pairs of <before> and <after> blocks to group changes that must be executed in a certain order All the keywords in an Updategram are defined in the namespace urn:schemasmicrosoft-com:xml-updategram The namespace must be associated with each Updategram, although with arbitrary prefixes, as in the following example: <ROOT xmlns:u="urn:schemas-microsoft-com:xml-updategram"> <u:sync> <u:before> <Customers customerid="999" .. /> </u:before> <u:after> <Customers customerid="1999" .. /> </u:after> </u:sync> By default, the Updategram maps any first-level element below the <before> and <after> blocks to a table of the same name in the current database Any attribute in that node is implicitly mapped to columns in that table.

For example, in the preceding sample script, the Updategram would work on the Customers table, removing the row with a customerid attribute of 999 and replacing it with a new row with a customerid attribute of 1999 You can specify a mapping schema using the mapping-schema attribute, as shown in the following code The attribute references an XML file (typically an XDR or XSD file) that describes the nature of the mapping in much the same way as described earlier for XML bulk loading (See the section "XML Bulk Loading in Action," on page 379) <u:sync mapping-schema="schemaxml"> Note The schema for XML bulk loading does not recognize the sql:identity annotation to flag identity auto-increment columns, which means that XML bulk loading is unable to handle tables with this feature On the other hand, Updategrams handle identity columns nicely.

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The default formatting is None. Some HTML formatting, such as merged cells, creates problems for data analysis in Excel. If you want to use the query results in pivot tables or charts, choose the None option. Choose Rich text formatting only or Full HTML formatting if you don t need to analyze the data and want to retain the formatting from the web site. These formatting options are generic options for use with web pages. When you query a list from a SharePoint site, don t bother to change formatting. Your query doesn t actually retrieve the text from the web site. SharePoint list pages include a custom HTML tag that redirects the query to the list s data source, so you re retrieving XML data in plain text, directly from SharePoint s database.

You simply annotate the column in the schema and set the sql:identity attribute to Ignore if you need to rely on the SQL Server generated values or to useValue if a user-provided value should be used instead NULL values also require special handling In practice, you declare an alternative text-based representation for NULL values and use 311.

After you run the query for the first time, you ll want to apply some formatting. However, the default settings discard formatting applied to the cells included in the query results when the query is refreshed. Column formatting for example, column widths is retained. To keep the formatting you ve applied to cells so you don t need to reapply formatting every time the query refreshes, enable the Preserve cell formatting checkbox in the Data formatting and layout section of the External Data Range Properties dialog box.

that throughout the Updategram. The nullvalue attribute indicates the alternative text, as shown here: <u:sync u:nullvalue="IsNULL" > <u:before> <Employees EmployeeID="1" Title="IsNULL" /> </u:before> ... Submitting Commands Through Updategrams Updategrams can be executed in various ways. You can send the Updategram text to SQL Server over HTTP. Alternatively, you can write the XML contents out to a file and then point the browser (or any other HTTP-enabled software) to that URL so that the contents are executed. Or you can use an Updategram with ADO. The following Visual Basic 6.0 code shows how to proceed. Notice that you must copy the Updategram to a stream and receive the response over another stream object. Dim cmd As New ADODB.Command Dim conn As New ADODB.Connection Dim strIn As New ADODB.Stream Dim strOut As New ADODB.Stream conn.Provider = "SQLOLEDB" conn.Open "SERVER=localhost;DATABASE=northwind;UID=sa;" conn.Properties("SQLXML Version") = "SQLXML.3.0" Set cmd.ActiveConnection = conn cmd.Dialect = "{5d531cb2-e6ed-11d2-b252-00c04f681b71}" strIn.Open strIn.WriteText SQLxml strIn.Position = 0 Set cmd.CommandStream = strIn strOut.Open cmd.Properties("Output Stream").Value = strOut cmd.Properties("Output Encoding").Value = "UTF-8" cmd.Execute , , adExecuteStream Notice also that you need to set the command dialect to a particular globally unique identifier (GUID) DBGUID_MSSQLXML and set a few properties on the command and the connection objects. Concurrency Issues Updategrams are batches that work by looping on source data and executing a sequence of commands. What happens if, due to the system concurrency, rows that you are going to modify have been changed since the time you last read them 312

In the Select Table dialog box, shown in Figure 9-3, select the sheet that contains the data you wish to merge with your document. Before you click OK, make sure the box beside the option First row of data contains column headers is checked.

Updategrams have been designed to provide three levels of protection against this kind of conflict, as follows: Blind updates You specify only the primary key of the record in the <before> block In this case, the change is persisted without first checking whether the current status of the record is consistent with the expected one Partial conflict detection The <before> block contains the primary key as well as any other field you plan to update When the Updategram executes, the change is applied only if the specified fields haven't been changed in the meantime Total conflict detection All the columns in the row are checked, and the change fails if any of them has been modified You can obtain this form of protection either by listing all the fields in the <before> block or by using the table timestamp column, if one exists.

With the default settings, Excel automatically interprets dates in the query results and presents them in short form. If you have non-date text entries such as 11-12, and you don t want Excel to convert them to November 12, check the Disable date recognition checkbox.

A timestamp column will be updated whenever a user writes something to the row Updategrams and DiffGrams If you're familiar with ADONET, you'll no doubt notice a close similarity, both conceptual and physical, between Updategrams and DiffGrams Although ADONET DiffGrams are a newer format and perhaps the format of the future currently, SQL Server 2000 natively supports only Updategrams In the section "SQLXML Managed Classes," on page 386, we'll take a quick tour of the managed classes in SQLXML 30 You'll notice that some of these classes apparently enable you to send DiffGrams to SQL Server Although this is possible, the actual implementation is not particularly effective The source DiffGram is in fact internally transformed into an Updategram and then processed by SQL Server Apart from the patent similarity in their schemas, Updategrams and DiffGrams have slightly different goals.

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