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In Exercise 5-1, you saw how a function could be written to override a themable function. As useful as this is, generating HTML from within functions can be very tiresome work. PHPTemplate makes the process of creating themable functions much easier and modular by introducing template files. The required file page.tpl.php is one such template file that will be used whenever theme('page') is called. This template must be provided by the theme itself. Other template files are provided by the PHPTemplate engine. These include block.tpl.php, box.tpl.php, comment.tpl.php, and node.tpl.php (see Figure 5-5 earlier in the chapter). These files override the block, box, comment, and node themable functions, respectively. If any of these four files appear in your theme folder alongside page.tpl.php, they will override the version in themes/engines/phptemplate. The template files are completely reusable; you could trade and mix the five standard tpl.php files between themes and expect, at a minimum, that they will be called at the appropriate time. Furthermore, since they are include files and not functions, you can write all the

Criteria crit = session.createCriteria(User.class); crit.addOrder( Order.asc("name") ); crit.setFirstResult(40); crit.setMaxResults(20); List results = crit.list();

HTML code without needing to worry about escaping quotation marks or concatenating strings a fact that greatly improves the readability of template files over PHP functions that do the same thing.

Starting from the fortieth object, we retrieve the next 20 objects. Note that there is no standard way to express pagination in SQL but Hibernate knows the tricks to make this work efficiently on your particular database. You can use the method-chaining coding style (methods return the receiving object instead of void) with both the Query and Criteria interfaces, rewriting the two previous examples as follows:

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Figure 1 6. Credit Card Reader (pPos) logic board (top view). The two black squares are the ICs that do most of the accessory s heavy lifting. The silver connector at the top attaches the board to the iPhone and the orange connector at the lower right goes to the card reader subassembly.

List results = session.createQuery("from User u order by u.name asc") .setFirstResult(0) .setMaxResults(10) .list(); List results = session.createCriteria(User.class) .addOrder( Order.asc("name") ) .setFirstResult(40) .setMaxResults(20) .list();

If you are a web designer and you ve been given the task of creating a Drupal theme, you need not be scared of the fact that the templates mix PHP and HTML code Even if you ve never programmed PHP before, the amount of skill and knowledge needed to work with the themes is small enough that you will be able to learn it quickly Here are some examples of what you might see and explanations of what they do The first is a simple print construct: < php print $picture > This construct prints the contents of a variable (sends the contents to the browser for display on the screen) In this case, the variable $picture is being printed The < php and > tags identify the parts that are to be interpreted as PHP and keep the PHP separate from the rest of the template.

Chaining method calls is less verbose and is supported by many Hibernate APIs. Listing and iterating results The list() method executes the query and returns the results as a list:

Here is a conditional print construct: < php print ($sticky) "sticky" : ""; > This is a more elaborate version of the first example, which uses the and : to make a decision In this case, it can be read if $sticky is set, print the text sticky; otherwise, print nothing ("") The following uses if to make a decision: < php if ($picture): > <br class='clear' /> < php endif; > In this example, the first line asks is $picture true If so, the text <br class='clear' /> will be printed Note that the opening if statement must be closed by a corresponding endif statement Finally, this code creates a list: <ul id="primary"> < php foreach ($primary_links as $link): > <li>< php print $link ></li> < php endforeach; > </ul> This example shows how to build an unordered list <ul> with a variable number of list items <li>.

The key point to take away from this discussion of the PoS accessory is how simple the actual accessory really is. Think of it this way: the iPhone is a computer, to which you wish to attach something to do something. With an external accessory, you make this connection happen. You attach a card reader to do point of sale processing. You attach a thermocouple (temperature sensor) to monitor heating and cooling. You attach a knob and a button to play a game your game controller. NOTE: The distinction between what an accessory may be used for and the portion of the accessory that acts as merely an interface will not always be this clear. In some cases, the processor shown in the PoS terminal may act as both an interface and the accessory itself, only if the processor has been tasked to perform some special processing that cannot be done by the iPhone hardware alone.

List result = session.createQuery("from User").list();

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