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As you would expect, Qt provides a host of user interface widgets to present things such as lists of items to the user. These widgets, such as QListWidget, provide an itemoriented interface to your application, where you provide items (perhaps from a collection your application maintains) that the user can manipulate (such as to make a selection). This sounds good in theory, but in practice it has limitations. The key limitation is one of scalability as the size of your collection increases, it s more work and more memory to keep essentially two copies (one for your application and one for the widget). Worse, if an item in your collection changes, you need to synchronize the widget s item list with your item list, which includes the need to repaint the widget. Fortunately, there s a better way. Qt provides an implementation of the model-viewcontroller (MVC) pattern now commonplace in user interface development. The widgets QListWidget, QTableWidget, and QTreeWidget have corresponding classes, QListView, QTableView, and QTreeView, which each take a model of the data to present and monitor for changes, sharing data with the model to ensure both a small footprint and rapid updates. crystal reports 2d barcode generator How to Create Barcodes in Crystal Reports using Formulas and ... 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The previous code snippet shows the standard data you need to supply when connecting to a PostgreSQL server and uses five variables: $db_user represents the username. $db_pass represents the user s password. $db_host is the hostname of your PostgreSQL server. $db_name is the name of the database you re connecting to. $persistent is true if we want to create a persistent database connection or false otherwise. To disconnect from the database, you need to make $dbh = null. The following code snippet demonstrates how to create, open, and then close a PostgreSQL database connection and also catch any exceptions that are thrown: try { // Open connection $dbh = new PDO('pgsql:dbname=' . $db_name . 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Jun 22, 2016 · The Native 2D Barcode Generator is an easy to use object that may be embedded into a Crystal Report to create barcode images. public abstract class Summary extends ActiveConferencePage implements IExternalPage { private static final int BLOG_ENTRIES = 2; private static final int FEATURED_PRESENTERS = 3; /** * This method is used when being activated from an external page. * This will load up the conference based on the conference id passed * setting it on the state object. */ public void activateExternalPage(java.lang.Object[] parameters, IRequestCycle cycle) { // get the id of the requested conference Integer conferenceId = (Integer)parameters[0]; // retrieve the conference Summary and stores it to the user information ConferenceSummary summary = retrieveConferenceSummary(conferenceId); // set the summary object on the user object LoggedInUser user = getUserInformation(); user.setConferenceSummary(summary); } private ConferenceSummary retrieveConferenceSummary(Integer id) { // Get the summary for a particular conference ConferenceSummary summary = getConferenceService().getConferenceSummary(id); // Get the featured speakers summary.setFeaturedSpeakers( getConferenceService(). getFeaturedPresenters(id, FEATURED_PRESENTERS) ); // get the news summary.setNews(getConferenceService().getNews(id)); In 2, you implemented the code that intercepts and handles (and eventually reports) errors that happen in the HatShop site. PHP errors are the standard mechanism that you can use to react with an error happening in your PHP code. When a PHP error occurs, the execution stops; you can, however, define an error-handling function that is called just before the execution is terminated. You added such a function in 2, where you obtain as many details as possible about the error and log them for future reference. Having those details, a programmer can fix the code to avoid the same error happening in the future. PHP 5 introduced, along with other OOP features, a new way to handle runtime errors: enter exceptions. Exceptions represent the modern way of managing runtime errors in your code and are much more powerful and flexible than PHP errors. Exceptions are a very important part of the OO (Object Oriented) model, and PHP 5 introduces an exception model resembling that of other OOP languages such as Java and C#. 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