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' Create connection conn = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() cmd.CommandText = _ "select top 1 " _ & " customerid, " _ & " companyname " _ & "from " _ & " customers " cmd.Connection = conn Try ' Clear list box ListBox1.Items.Clear() ' Open connection - ConnStateChange event will be fired conn.Open() ' Create data reader Dim rdr As SqlDataReader = cmd.ExecuteReader() ' Display rows in list box While rdr.Read() ListBox1.Items.Add(rdr.GetString(0) & "-" & rdr.GetString(1)) End While Catch e1 As SqlException MessageBox.Show(e1.Message) Finally ' Close connection - ConnStateChange event will be fired conn.Close() End Try

Figure 1-3. The dvd.xml document shown as a tree structure Displaying the document in this way reinforces the relationship between the elements, as in a family tree. The <library> element is the parent of the <DVD> element and the grandparent of the <title>, <format>, and <genre> elements. The <DVD> elements are siblings and have the <library> element as a parent or ancestor. The <title>, <format>, and <genre> elements are descendants of the <library> element. DOM parsing allows access to these elements, their values, and all other parts of an XML document through either a programming language or a scripting language such as JavaScript.

Listing 15-2. ConnStateChange()

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A SAX-based parser presents an XML document as a string of events. You must write handlers for each event so that something suitable occurs when the event triggers the handler. This type of parsing works well with languages that have good event-handling properties. For instance, SAX parsing is used extensively with Java. It s less suitable for the scripting languages often employed on the web, so I don t cover it in detail here.

' Event handler for the StateChange Event Private Sub ConnStateChange( _ ByVal sender As Object, _ ByVal e As StateChangeEventArgs _ ) _ Handles conn.StateChange ListBox1.Items.Add("------------------------------") ListBox1.Items.Add("Entering StateChange Event Handler") ListBox1.Items.Add("Sender = " + sender.ToString()) ListBox1.Items.Add("Original State = " + e.OriginalState.ToString()) ListBox1.Items.Add("Current State = " + e.CurrentState.ToString()) ListBox1.Items.Add("Exiting StateChange Event Handler") ListBox1.Items.Add("------------------------------") End Sub

8. Build and run the solution with Ctrl+F5. Click the Connection StateChange Event button. You see the results in Figure 15-2.

Figure 3-43. SQL installing the LunchCounter database using the MX executor Regardless of which way you decide to deploy the LunchCounter module, you can check the installation by bringing up SQL Server Management Studio. If it is already up, simply click the server connection and press the F5 key to refresh the display. You should now see LunchCounter displayed as one of the databases under the Databases list. Expand LunchCounter, then click on Tables. (Figure 3-44 shows a partial view of the LunchCounter database Tables list.) Scroll down the list until you get to where the LunchCounter tables should appear. You should see four tables listed: LunchCounter.Breads LunchCounter.Condiments LunchCounter.SandwichOrders LunchCounter.Stuffs

Both processing models offer advantages. DOM-based parsing provides full read-write access to an XML document, and you can traverse the document tree to access nodes within the document. It can also validate a document against a DTD or XML schema to determine that the document is valid. However, DOM-based parsing must read the full XML document into memory, so DOM parsing can be slow and memory-intensive when working with large XML documents. It s difficult to determine exactly what constitutes a large XML document, because processing time depends on computing power, memory, time available, and whether it s working in a singleuser environment or a multiuser environment such as a web server. As a rule, most systems cope with documents up to tens of megabytes in size, but you need to take care with files above this size. The SAX-based model, on the other hand, is sequential in operation. Once a node has been processed, it is discarded and cannot be processed again. The whole document isn t loaded into memory at once, so you can avoid problems associated with processing large XML documents. This method of processing puts the onus on you to store any information from the XML document that might be required later. SAX is ideal, for example, as an intermediate routing product in a communications system. An incoming XML document is likely to consist of a small routing header and a larger document for delivery to the end point. Using SAX, a routing device can read the routing information and ignore the document, as the document is irrelevant to its delivery. A DOMbased parser, however, must parse the complete document to be able to deliver it to its ultimate destination.

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