c# barcode reader from image Defining the View in Visual C#.NET

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Defining the View
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Assuming the requested record ID is valid and a record matching it is found in the database, the controller renders the corresponding view, which, by convention, should be stored at $APP_ DIR/application/modules/catalog/views/scripts/item/displayphtml Here s what it looks like:
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<h2>View Item</h2> <h3> FOR SALE: < php echo $this->escape($this->item['Title']); > < php echo $this->escape($this->item['Year']); > < php echo $this->escape($this->item['Square_Model_Grade'] ['GradeName']); > </h3> <div id="container"> <div id="record"> <table> <tr> <td class="key">Title:</td> <td class="value"> < php echo $this->escape($this->item['Title']); > </td> </tr> <tr> <td class="key">Type:</td> <td class="value">
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Working with Models
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< php echo $this->escape( $this->item['Square_Model_Type']['TypeName']); > </td> </tr> <tr> <td class="key">Year:</td> <td class="value"> < php echo $this->escape($this->item['Year']); > </td> </tr> <tr> <td class="key">Country:</td> <td class="value"> < php echo $this->escape( $this->item['Square_Model_Country']['CountryName']); > </td> </tr> <tr> <td class="key">Denomination:</td> <td class="value"> < php echo $this->escape( sprintf('%012f', $this->item['Denomination'])); > </td> </tr> <tr> <td class="key">Grade:</td> <td class="value"> < php echo $this->escape( $this->item['Square_Model_Grade']['GradeName']); > </td> </tr> <tr> <td class="key">Sale price:</td> <td class="value"> $< php echo $this->escape($this->item['SalePriceMin']); > $< php echo $this->escape($this->item['SalePriceMax']); > </td> </tr> <tr> <td class="key">Description:</td> <td class="value"> < php echo $this->escape($this->item['Description']); > </td> </tr> </table> </div> </div>
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(continued)
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Zend Framework: A Beginner s Guide
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Figure 4-6
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The result of successfully retrieving a database record
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Nothing too complicated here This view script simply reformats the record retrieved by the model in the previous step, and displays it in a usable and readable format Notice the use of the escape() method to automatically escape the output of the view before displaying it to the user To see this in action, try accessing the URL http://squarelocalhost/catalog/item/1 in your browser If everything is working correctly, the controller will retrieve the record with ID #1 from the database (you ll remember that we manually added this record when initializing the database), assign it to the view, and render it The output should look something like Figure 4-6 As a test, you can also try accessing the same URL again, but with an invalid or missing record ID You should see either a Page not found or an Invalid input error, as shown in Figure 4-7
Figure 4-7
The result of an unsuccessful retrieval attempt
4:
Working with Models
Ask the Expert
Q: A:
Why do I need to escape output before displaying it As a general rule, you shouldn t trust any data that comes from an external source This is because it s always possible for attackers to embed malicious content into this data and, if you use it without first cleaning it, you might be putting your application s users at risk A common example of this type of exploit is the cross-site scripting attack, wherein an attacker is able to gain access to sensitive user data by piggybacking malicious JavaScript code or HTML form code into your Web pages With this in mind, it s always essential to pass output through a sanitization routine before displaying it to the user
Summary
While previous chapters have focused on views and controllers, this one focused on models: what they are, how they work, and what role they play in an MVC application Although the Zend Framework doesn t come with a dedicated model component, it s nevertheless quite easy to create your own or to integrate third-party models, such as those generated by the Doctrine ORM package, into a Zend Framework application This chapter demonstrated the process, showing you how to create Doctrine models and configure them to work in the context of a Zend Framework application It also introduced you to the Zend_Filter_Input component, a useful tool for ad-hoc input filtering and validation, and the Bootstrap class, which provides a framework for initializing application resources at run time The SQUARE example application is now significantly smarter as well It has a database for persistent storage, and a controller than can interact with it to retrieve and display database records More importantly, it finally has a set of robust, extensible models This will not only simplify data access and manipulation, but it will also provide a basis for the more advanced functionality discussed in later chapters of this book To learn more about the topics discussed in this chapter, consider visiting the following links:
The official Doctrine Web site and manual, at http://wwwdoctrine-projectorg/ and http://wwwdoctrine-projectorg/documentation/manual/1_1/en An introduction to Doctrine models, at http://wwwdoctrine-projectorg/documentation/ manual/1_1/en/introduction-to-models Information on how to express database relationships using Doctrine models, at http://wwwdoctrine-projectorg/documentation/manual/1_1/en/defining-models Sample queries using Doctrine, at http://wwwdoctrine-projectorg/documentation/manual/1_0/en/working-with-models
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