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Figure 13.1 In pessimistic locking, when a user wants to update the data the underlying records are locked and no other user can perform any operation on the data. It is typically implemented using SELECT ... FOR UPDATE semantics.

0.458747 0.547651

Figure 3-2

Summary

<UserControl x:Class="SilverlightSite.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft. com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <Button Content="Hello World!" x:Name="theButton" Click="theButton_Click"></Button> </Grid></UserControl>

Figure 13.4 XML Comments added to custom JavaScript objects are used by the IntelliSense tool in Visual Studio Orcas.

Notice that listing 8.15 presents a single query. We won t have to write it as we add new types of boats. Had we performed an ordering on the query, our results would not have been grouped by subclass as in the previous example. Our code is simpler, more flexible, and more powerful, just as object-oriented programming intended it to be.

The Dallas branch office is a PPTP-based branch office that uses a Windows Server 2003 router to create an on-demand, site-to-site VPN connection with the VPN server in New York as needed. When the connection is made and is idle for five minutes, the connection is terminated.

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In general, this is a pretty simple application of lessons you ve already learned. It s also an interesting application of the internet to Core Location. The only thing particularly innovative comes in the Core Location delegate B, where you create a GeoNames URL using the format documented at the GeoNames site. Then you watch the start tags C, content D, and end tags E, and use those to derive altitude the same way that you pulled out XML information when you were reading RSS feeds. As we mentioned in chapter 17, the result should be an altitude that s much more reliable than what the iPhone can currently provide, unless you re in a tall building, in an airplane, or hang gliding. To date, all of our examples of web parsing have involved simple GET connections, where you can encode arguments as part of a URL. That won t always be the case on the web, and before we leave web pages behind, we re going to return to some basics of URL requests and look at how to POST information to a web page when it becomes necessary.

When you call this method, the waitObject argument identifies the kernel object that you want the thread pool to wait for . Since this parameter is of the abstract base class WaitHandle, you can specify any class derived from this base class . Specifically, you can pass a reference to a Semaphore, Mutex, AutoResetEvent, or ManualResetEvent object . The second parameter, callback, identifies the method that you want the thread pool thread to call . The callback method that you write must match the System.Threading. WaitOrTimerCallback delegate, which is defined as follows:

The persistence manager may be exposed by several different interfaces. In the case of Hibernate, these are Session, Query, Criteria, and Transaction. Under the covers, the implementations of these interfaces are coupled tightly together. In Java Persistence, the main interface you interact with is the EntityManager; it has the same role as the Hibernate Session. Other Java Persistence interfaces are Query and EntityTransaction (you can probably guess what their counterpart in native Hibernate is). We ll now show you how to load and store objects with Hibernate and Java Persistence. Sometimes both have exactly the same semantics and API, and even the method names are the same. It s therefore much more important to keep your eyes open for little differences. To make this part of the book easier to understand, we decided to use a different strategy than usual and explain Hibernate first and then Java Persistence. Let s start with Hibernate, assuming that you write an application that relies on the native API.

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