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Next, you configure the @employeeid parameter, mapping it to a data column named employeeid. Unlike @city, which by default takes values from the current version of the data table, you want to make sure that @employeeid gets values from the version before any changes. Although it doesn t matter here, since you don t change any employee IDs, it s a good habit to specify the original version for primary keys, so if they do change, the correct rows are accessed in the database table. Note also that you save the reference returned by the Add method so you can set its SourceVersion property. Since you don t need to do anything else with @city, you don t have to save a reference to it. ' EmployeeID Dim parm As SqlParameter = cmd.Parameters.Add _ ("@employeeid", SqlDbType.Int, 4, "employeeid") parm.SourceVersion = DataRowVersion.Original Finally, you set the data adapter s UpdateCommand property with the command to update the Employees table so it will be the SQL the data adapter executes when you call its Update method. You then call Update on the data adapter to propagate the change to the database. Here you have only one change, but since the SQL is parameterized, the data adapter will look for all changed rows in the employees data table and submit updates for all of them to the database. ' Update database da.UpdateCommand = cmd da.Update(ds, "employees") Figure 13-7 shows the change to the city, and if you check with Database Explorer or SSMSE, you ll see the update has been propagated to the database. The city for employee Steven Buchanan is now Wilmington, not London.

As with everything else in the world, there are good and bad issues with both SAX and DOM parsing. This section looks at some of these and may aid you in making your decision of which methodology to use when your time comes. Believe us your time will come! There s no way to avoid it short of passing it off to someone else. Here are the most prevalent pros and cons:

First you created the data reader and tried to access an invalid column:

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Event-based parsing via SAX provides simple, lower-level access to an XML document. Documents much larger than available system memory can be parsed, and callback handlers allow construction of specific data structures. DOM parsing is inefficient. You start by building a memory-resident tree of parse nodes, only to map it onto new data structures and then discard the original tree. SAX parsing is serial (read that as unidirectional). Previously parsed elements cannot be reread without starting the parsing operation again.

' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Access nonexistent column Dim str As String = rdr.GetValue(20).ToString()

The data adapter uses the InsertCommand property for inserting rows into a table. Upon calling the Update method, all rows added to the data table will be searched for and propagated to the database.

DOM parsing is parallel (read that as random access). Once an element is memory resident, it can be accessed again and again in any order you choose. This includes multithreaded applications accessing the element in parallel to increase performance. DOM-based parsing can put a strain on system resources, especially if the document is large.

An exception is thrown because you tried to get the value of column 20, which doesn t exist. You added a new Catch clause to handle this kind of ADO.NET error:

A while back Elliot Rusty Harold, who is well known in XML circles, tested several DOM parsers to see what their memory requirements were, and the results were surprising. The test consisted of loading the XML specification, second edition, into a DOM Document object. This document in file size was 197KB. The simple program he wrote to do this yielded the results given in table 13.3.

Let s propagate a new row to the database, in another variation on ModifyDataTable.vb in Listing 13-4. 1. Add a new Visual Basic Console Application project named PersistAdds to your 13 solution. Rename Module1.vb to PersistAdds.vb. 2. Replace the code in PersistAdds.vb with the code in Listing 13-6.

Memory requirements 1489K 1230K 2500K Table 13.3 DOM model memory requirements for several DOM parsers

Catch ex As System.InvalidOperationException Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Message: " & ex.Message str &= ControlChars.NewLine & ControlChars.NewLine str &= "Stack Trace: " & ex.StackTrace MessageBox.Show(str, "Specific Exception")

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