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Now that you ve seen the new model of server controls, you might wonder why you need additional web controls. But in fact, HTML controls are much more limited than server controls need to be. For example, every HTML control corresponds directly to an HTML tag, meaning you re bound by the limitations and abilities of HTML. Web controls, on the other hand, have no such restriction. They emphasize the future of web design. These are some of the reasons you should switch to web controls: They provide a rich user interface: A web control is programmed as an object but doesn t necessarily correspond to a single element in the final HTML page. For example, you might create a single Calendar or GridView control, which will be rendered as dozens of HTML elements in the final page. When using ASP .NET programs, you don t need to know anything about HTML. The control creates the required HTML tags for you. They provide a consistent object model: HTML is full of quirks and idiosyncrasies. For example, a simple text box can appear as one of three elements, including <textarea>, <input type="text">, and <input type="password">. With web controls, these three elements are consolidated as a single TextBox control. Depending on the properties you set, .NET renders may differ. Similarly, the names of the underlying HTML element that ASP properties don t follow the HTML attribute names. For example, controls that display text, whether it s a caption or a text box that can be edited by the user, expose a Text property.

To generate the list of tags and the number of posts that have that tag, we must write another new function for DatabaseObject_BlogPost, which we call GetTagSummary(). To retrieve the number of posts for each tag, we must use the following SQL statement: SELECT count(*) as count, t.tag FROM blog_posts_tags t INNER JOIN blog_posts p ON p.post_id = t.post_id WHERE p.user_id = [user id] AND p.status = 'L' GROUP BY t.tag The only problem with this query is that it differentiates between uppercase and lowercase versions of the same tag, whereas we don t want it to do so. To deal with this, we add some extra processing to GetTagSummary(). Listing 10-11 shows the full function to go in ./include/DatabaseObject/BlogPost.php. Listing 10-11. Retrieving a Summary of All Tags for a Single User (BlogPost.php) < php class DatabaseObject_BlogPost extends DatabaseObject { // ... other code public static function GetTagSummary($db, $user_id) { $select = $db->select(); $select->from(array('t' => 'blog_posts_tags'), array('count(*) as count', 't.tag')) ->joinInner(array('p' => 'blog_posts'), 'p.post_id = t.post_id',

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They tailor their output automatically: ASP .NET server controls can detect the type of browser and automatically adjust the HTML code they write to take advantage of features such as support for JavaScript. You don t need to know about the client because ASP .NET handles that layer and automatically uses the best possible set of features. This feature is known as adaptive rendering. They provide high-level features: You ll see that web controls allow you to access additional events, properties, and methods that don t correspond directly to typical HTML controls. ASP .NET implements these features by using a combination of tricks. Throughout this book, you ll see examples that use the full set of web controls. To master ASP.NET development, you need to become comfortable with these user-interface ingredients and understand their abilities. HTML server controls, on the other hand, are less important for web development. You ll only use them if you re migrating an existing HTML page to the ASP .NET world, or if you need to have fine-grained control over the HTML code that will be generated and sent to the client.

You could use the return value from this method to determine the number of rows that were updated, and check that to determine if the update was a success if you haven t updated a single row, then something has gone wrong And if, in this instance, you ve updated more than one row, then something has gone more wrong You re also not taking into account any changes that may be made by another user What happens if changes are made by another user to the Player while you re making your changes Whoever updates the Player first will lose those changes, and only the latest changes will be stored in the database This may be what you want to happen, but it also may be incorrect You may not want to allow the second update if the data has changed.

array()) ->where('p.user_id = ', $user_id) ->where('p.status = ', self::STATUS_LIVE) ->group('t.tag'); $result = $db->query($select); $tags = $result->fetchAll(); $summary = array(); foreach ($tags as $tag) { $_tag = strtolower($tag['tag']); if (array_key_exists($_tag, $summary)) $summary[$_tag]['count'] += $tag['count']; else $summary[$_tag] = $tag; } return $summary; } } > Next we write a Smarty plug-in that calls this function, just as we have done previously when listing the monthly blog archive. This works almost identically, except it returns a summary of tags rather than months. Listing 10-12 shows the code for this plug-in, which we can then access in templates using {get_tag_summary}. Listing 10-12. A Smarty Plug-in Used to Retrieve a User s Tag Summary (function.get_tag_ summary.php) < php function smarty_function_get_tag_summary($params, $smarty) { $db = Zend_Registry::get('db'); $user_id = (int) $params['user_id']; $summary = DatabaseObject_BlogPost::GetTagSummary($db, $user_id); if (isset($params['assign']) && strlen($params['assign']) > 0) $smarty->assign($params['assign'], $summary); } >

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