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While Qt makes easy work of most I/O tasks, I/O brings its own issue: latency. While a QIODevice is working, your application waits; wait too long and your application performance will suffer as the UI thread stalls, blocking on pending I/O operations. In some cases, such as application launch, this isn t a problem. But in many cases (especially network I/O), it can be. Fortunately, to help with this and other tasks that can be run in parallel, Qt provides a platform-independent thread implementation, so you can move lengthy tasks to run in separate threads within your application. The Qt class QThread is at the heart of Qt s thread support, and provides the usual semantics for creating, managing, and terminating a single thread. To create a thread, you simply subclass QThread and override its run method. At run time, you only need to create an instance of your thread class and invoke start. In turn, Qt spawns a platform thread and uses it to execute your run method. Once the run method exits, the QThread cleans up and releases the thread it used. A thread may have (although it doesn t have to) an event loop that you can start by calling exec in your thread s run method. This makes it possible to connect signals and slots between your thread and other threads, such as the main thread on which the user interface of your application runs.

/** * Handles the user logout * @param cycle */ public void logout(IRequestCycle cycle) { LoggedInUser user = getUserInformation(); user.setUserSummary(null); setUserInformation(user); } // Login objects public abstract void setLogin(String s); public abstract String getLogin(); public abstract void setPassword(String s); public abstract String getPassword(); // get and store the user information public abstract LoggedInUser getUserInformation(); public abstract void setUserInformation(LoggedInUser u); // the page service public abstract UserService getUserService(); }

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The SQL queries you write must be sent somehow to the database engine for execution. As you learned in 2, you ll use PHP PDO to access the PostgreSQL server. Before writing the business tier code, you need to analyze and understand the possibilities for implementation. The important questions to answer before writing any code include the following: What strategy should you adopt for opening and closing database connections, when you need to execute an SQL query Which methods of PHP PDO should you use for executing database functions and returning the results How should you handle possible errors and integrate the error-handling solution with the error-handling code you wrote in 2 Let s have a look at each of these questions one by one, and then we ll start writing some code.

There are two main possible approaches you can take for this. The first is illustrated by the following sequence of actions, which needs to be executed each time the database needs to be accessed. 1. Open a connection to the database exactly before you need to execute a command on the database. 2. Execute the SQL query (or the database function) using the open connection, and get back the results. At this stage, you also need to handle any possible errors. 3. Close the database connection immediately after executing the command. This method has the advantage that you don t keep database connections for a long time (which is good because database connections consume server resources) and is also encouraged for servers that don t allow many simultaneous database connections. The disadvantage is the overhead implied by opening and closing the database connection all the time, which can be partially reduced by using persistent connections.

With the ConferenceBorder in place we can now begin fleshing out the pages of the TechConf application. The first page that is shown after the user selects a particular conference from the TechConf home page is the conference Summary page. The details page shows information such as: A description of the conference The dates the conference is accepting abstract submissions from potential speakers The conference tracks A list of featured speakers News headlines from the list of conference news items Blog headings from the speaker blogs Figure 7-19 shows a preview of the HTML template for the Summary page. To use the ConferenceBorder component as the template for the Summary page, we simply declare the component in the html element of the page template as shown next:

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