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database. (Depending on whom you ask, the data store may or may not be considered an integral part of the three-tiered architecture.) These are the main steps you ll take toward having your own dynamically generated departments list. Note that you start with the database and make your way to the presentation tier: 1. Create the department table in the database. This table will store data regarding the store s departments. Before adding this table, you ll learn the basic concepts of working with relational databases. 2. Write a PostgreSQL function named catalog_get_departments_list, which returns the IDs and names of the departments from the department table. PHP scripts will call this function to generate the departments list for your visitor. PostgreSQL functions are logically located in the data tier of your application. At this step, you ll learn how to speak to your relational database using SQL. 3. Create the DatabaseHandler class, which will be your helper class that performs common database interaction operations. DatabaseHandler is a wrapper class for some PDO functions and includes consistent error-handling techniques that deal with database-related errors. 4. Create the business tier components of the departments list (the Catalog class and its GetDepartments method). You ll see how to communicate with the database, through the DatabaseHandler helper class, to retrieve the necessary data. 5. Implement the departments_list Smarty template and its Smarty plugin function, which build on the lower layers to generate a good-looking list of departments for your visitor. The Smarty plugin function file will also contain a helper class named DepartmentsList. So, let s start by creating the department table.

8. 9.

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I mentioned previously that you can declare a Tapestry component implicitly in the HTML template by using the syntax @Type , where type is the specific component type. The page file provides a level of indirection that gives you flexibility to keep changes to the HTML templates to a minimum. But if most of the bindings in your page files are as simple as the ones shown in the example, then you might get a proliferation of page files that can clutter your project. Listing 7-7 shows a version of the HTML template for the Home.html page using implicit components. Listing 7-7. HTML Template Using Implicit Components <html> <body> <h1>Tapestry Time</h1> The current time is <span jwcid="@Insert" value="ognl:time" >high noon</span>! </body> </html> With these additions you could now remove the Home.page file. However, you ll need a way to tell the Tapestry template parser and consequently the OGNL expression evaluation where to find the getTime method. Tapestry uses a global configuration file for your application, which should be named with the same name as the servlet mapping name and end with the .application extension. In the case of the tapestry-time application, the configuration file is tapestry-time.application and should be located WEB-INF directory. The application XML file format is also defined in the Tapestry_4_0.dtd. This file is used to declare global locations for classes, components, and third-party component libraries. Listing 7-8 shows a minimal application XML file for the tapestry-time application with a meta element defining the package (com.integrallis.time) for the property org.apache.tapestry.page-class-packages, which tells Tapestry where to look for the Java code for a page component.

The vast majority of web applications, e-commerce web sites being no exception, live around the data they manage. Analyzing and understanding the data you need to store and process is an essential step in successfully completing your project. The typical data storage solution for this kind of application is a relational database. However, this is not a requirement you have the freedom to create your own data access layer and have whatever kind of data structures you want to support your application.

10. Click the Run button. After a short pause while the IDE rebuilds your application for MeeGo, you ll see the application running on the device. The device s developer account and password work well if you re only going to do a quick test with a device, but for regular work, you re much better off creating a secure shell (SSH) key pair and installing the key on the device. To do this: 1. 2. 3. 4. 5. Return to the Tools menu s Maemo Emulator options. Create a new configuration and ensure that the Key authentication type is selected. Click Generate SSH key and save the public and private keys somewhere. (You ll want to guard the private key, of course). Choose Deploy Public Key and choose the public key file you just created. Change the configuration to use the one you just created.

Note In some particular cases, it may be preferable to store your data in plain text files or XML files

Listing 7-8. Tapestry Application Configuration File <!DOCTYPE application PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> <application name="Tapestry Demo"> <!-- =================================================================== --> <!-- Global location for page Java implementations --> <!-- =================================================================== --> <meta key="org.apache.tapestry.page-class-packages" value="com.integrallis.time" /> </application> Figure 7-8 shows a graphical depiction of the application element.

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