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XML, the Extensible Markup Language, has become ubiquitous. There s no getting away from it regardless of how hard you try. Quite a few Integrated Library Systems (ILS) are heavily invested in utilizing XML. Many applications configuration files are still formatted with it. If you really want to see just how far XML has been able to penetrate the market, search Google with the phrase systems using xml. We think you ll be surprised not just at how many systems use it but also at the variety of applications. Hibernate Search doesn t handle XML in the way you d normally expect. That is, it wasn t designed to take XML documents, parse them into individual entities, and index them. It was, however, designed to parse individual entity properties containing XML and index the extracted content.

7. Run the program with Ctrl+F5. Click the ADO.NET Exception-1 button, and you see the message box in Figure 13-2. Click Quit.

This doesn t mean that we re saying entities cannot be built from XML documents; they can. All we re saying is that doing so is outside the scope of this discussion, and you ll have to build the entities before calling on Hibernate Search.

8. Modify the Button1_Click event handler with the bold code in Listing 13-2. (We ve indented unchanged code as required, but haven t highlighted it.)

This process is what we re going to talk about in this section. We ll discuss both the serial Simple API for XML (SAX) and then move on to the Document Object Model (DOM).

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You then loop through the rows in the data view: ' display data from data view Dim drv As DataRowView For Each drv In dv Dim i As Integer For i = 0 To dv.Table.Columns.Count - 1 Console.Write((drv(i) + ControlChars.Tab)) Next i Console.WriteLine() Next drv Just as a data row represents a single row in a data table, a data row view (perhaps it would have been better to call it a data view row) represents a single row in a data view. You retrieve the filtered and the sorted column data for each data row view and output it to the console. As this simple example suggests, data views offer a powerful and flexible means of dynamically changing what data one works within a data table.

SAX was the first widely adopted API for XML in Java and is a de facto standard. A SAX XML parser functions as a stream parser and is event-driven. The SAX events include

Listing 13-2. Modifications to Button1_Click()

but are not limited to the following: XML text nodes XML element nodes XML processing instructions XML comments Events are fired when each of these XML facets starts and again when they end. For example, suppose we have an XML element <content> </content>. An element start event is fired when the <content> element is read, and an element end event is fired when the </content> element is read. Any XML attributes present on an element are provided as part of the data passed to element events. In order to respond to these events, you define callback methods that will be called by the parser when these events occur. These callback methods are usually defined in a subclass of the DocumentHandler interface, but we recommend that you extend the DefaultHandler class in your code. The DefaultHandler class furnishes default implementations of each of the DocumentHandler interface s methods analogously to a Java adapter class. Utilizing this will save you quite a lot of work. Several SAX parsers are available, and a partial list of them is given in table 13.2. Let s look at an example of parsing XML with a SAX parser. For our examples we ll use the Xerces-J parser. The entity we ll use in this example is a CD entity and is shown in listing 13.14.

' Create connection Dim conn As SqlConnection = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ )

In the following sections, you ll work through a practical example showing a number of ways to update data in data tables programmatically. Note that here you ll just modify the data in the dataset but not update the data in the database. You ll see in the Propagating Changes to a Data Source section how to persist the original data source changes made to a dataset.

Lightweight nonvalidating parser; free Optionally validates; proprietary Optionally validates; open source Optionally validates; open source

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