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Our modal web view controller code references an HTML page whose content should be displayed in the info panel. This is a standard HTML/CSS document, which displays some text and an image. That file is included in the source code archive for this book (along with the image file it references, booktitle.png). You can copy both files from the source code archive into your project, or just make a new empty bookInfo.html file in your Xcode project using the New File Assistant (pick Empty File from the Other section) and giving it something like the following content:





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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta name="viewport" content="width=540" /> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Beginning iPad Development for iPhone Developers: Mastering the iPad SDK</title> <style type="text/css">





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Figure 8 6. The DataMapper pattern: A UserMapper acts as the mediator between the RDBMS and User class A big decision must be made whether to implement the DAL manually, which allows a greater degree of control over the code, or whether to integrate a third-party library, which will generate the mapping layer automatically. Although the latter will undoubtedly be quicker to implement, assimilating a library into a project remains a non-trivial task that requires significant developer resource. There are enough Object Relational Mapping (ORM) libraries available at no cost that using an existing solution should be the default position. However, guidance for manually implementing the DAL is provided to give background on the internal workings of an ORM. Then, the current most popular thirdparty ORM libraries are briefly compared and contrasted.

Click OK in the Advanced Edit dialog box to return to the Create New Condition dialog box. For this example, we want the policy to fail if there are more than ten databases. Change the Operator to <= and type 10 in the Value field. Figure 222 shows the completed condition.

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<!-body { background: #000 url(booktitle.png) fixed bottom no-repeat; margin: 0px; font-family: Arial, Helvetica, sans-serif; font-size: 20px; color: #FC3; } a:link { color: #FFF; } a:visited { color: #FFF; } a:hover { color: #FFF; } a:active { color: #FFF; } .intro { padding: 30px; -align: center; } --> </style></head> <body><div class="intro">Leverage your iPhone development skills to build apps for the iPad. Learn how to utilize all of the new iPad SDK features from <b>Dudel</b> in your own apps, plus so much more! This book includes the full source code for <b>Dudel</b>. </p> </body> </html>

Before undertaking the monumental task of manually implementing a mapping layer, consider whether the resources required are worth the gains in control. Reinvention of the wheel should be avoided if possible, especially when there are so many compelling ORM libraries available. The DAL fits into the category of application infrastructure any effort expended building infrastructure is effort diverted from adding true value to a project. Caveats aside, it is still beneficial to understand what goes into a mapping layer because there is a lot of noise generated by third-party components that must remain domain agnostic so that it remains all things to all people, which is not an easy task. Listing 8 2 shows the interface of the UserMapper class that will be used by the ViewModel to interact with the underlying data storage mechanism. The implementation will follow: method-by-method. For now, notice that there are four methods for finding Users, two of which return a unique User when given their ID and EmailAddress fields, respectively, two of which return lists of Users. The FindByName method accepts a partial name and, because User Names are not unique, multiple User instances may be returned. The FindAll method, on the other hand, returns every user in the database without discrimination.

Now let s deal with DudelViewController, where we ll tie up the loose ends needed to display this web view. Start with the DudelViewController.h file, adding this line:

Figure 2-22. The condition for the Check Number of Databases policy in the Create New Condition dialog box 8. 9. Click OK to return to the Create Policy dialog box. Enter any remaining information you would like for the policy, such as a brief description and category.

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20 Jun 2017 ... Learn how to read QR code images in Java using google's zxing library.

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