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Most ORM tools attempt to abstract the physical database into business objects. With that abstraction, we typically lose the ability to perform SQL queries, which is a large part of the attraction to relational databases. This is what separates LINQ to SQL from many of its contemporaries. Not only do we get the convenience of business objects that are mapped to the database, we get a fullblown query language, similar to the already familiar SQL, thrown in to boot.

AcceptChanges method that we call after obtaining the DataRow object We call this method to make the DataRow object accept the current value for each DataColumn object within it as the original version Without that, there would be no original version of the DataColumn objects values, and merely attempting to access the field s original version causes an exception to be thrown In this way, the DataRow object is ready to begin tracking DataColumn object value changes We need this to be able to obtain different DataRowVersion versions of the DataRow object s DataColumn values Once we call the AcceptChanges method the first time, we set a field using the SetField operator We then display the original version and current version of the Name DataColumn value to the console At this point, the original version should be "Anthony Adams", and the current version should be "George Oscar Bluth".

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To traverse backward through an element s attributes, reference the PreviousAttribute property on an attribute. Listing 7-77 is an example. Listing 7-77. Accessing the Previous Attribute with the PreviousAttribute Property // I will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(firstParticipant.FirstAttribute.NextAttribute.PreviousAttribute); Notice I chain the FirstAttribute and NextAttribute properties to get a reference to the second attribute from which to go backward. This should take me back to the first attribute. Here are the results:

This allows you to see the different versions you can obtain from a DataRow object Then, just to make it interesting, we call the AcceptChanges method a second time and again display the original and current version of the DataColumn object s value This time, the original and current version values should both be "George Oscar Bluth", because we have told the DataRow object to accept the changes as the current version Let s examine the results: Original value = Anthony Adams : Current value = George Oscar Bluth Original value = George Oscar Bluth : Current value = George Oscar Bluth That works like a charm Remember, though, without calling the AcceptChanges method the first time, we could have changed the value of the DataColumn object all day long and there would not have been an original version.

Since XUL components are part of the Mozilla GRE, there is no need to explode the JSF page structure into the appropriate markup on the server before sending the markup to the client. This in turn will reduce the network payload since rendering is taken care of by the client and not by the actual server implementation. Another great feature of XUL is its extensibility, providing a declarative way to create new components and extend existing XUL components. To enable this feature, XUL uses XBL. You attach these behavioral XBL components to markup using CSS selectors. And, of course, XUL provides out-of-the-box rich client interactivity without forcing the component author to implement this in an alternative solution such as JavaScript. We will show how you can combine the Ajax asynchronous communication channel XMLHttpRequest with the highly interactive components provided by XUL to design reusable and extremely interactive components based on the JSF standard.

We mentioned that one of the additional benefits of using the Field<T> operator is that it handles the situation when fields are null Let s take a look at the example in Listing 10-14 where a student s name has a null value, but we are not using the Field<T> operator:.

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