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Let s look at each field in shopping_cart: cart_id stores a unique ID that you ll generate for each shopping cart. This is not an integer field like other ID columns you ve created so far. It is a char field and will be filled with an MD5 hash of a unique ID, which will be a 32-character string. product_id references the ID of an existing product. quantity stores the product s shopping cart quantity. buy_now helps you implement the Save for Later functionality. The buy_now field is a boolean type with the default value of true. When the customer proceeds to check out, only the products that have this value set to true are added to the order, whereas the Save for Later products remain in the shopping cart. This feature is useful because it allows the visitor to keep more products in the shopping cart than he or she can afford (or wants to buy) at the moment and allows the visitor to order only a selection of the products in the shopping cart. added_on will be populated with the current date when a new product is added to the cart and is useful when deleting old shopping carts from the database.

This code starts Qt Mobility s Position API to emit position information on a regular basis, invoking our positionUpdated slot when new position data becomes available. Listing 5 11 shows the method that handles that data, code that splits out the latitude and longitude and stores it in a QPair the way we stored position data in the previous chapter s example.

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Even if you re using a formatting tool either at build time or with your favorite IDE, there are still style checks beyond the realm of formatting. Checkstyle is a tool that enables code to be checked against a convention. Checkstyle supports the Sun convention by default, although it can check for more than just simple formatting. For example, it can check for illegal regular expressions in the code, inline conditionals, double-checked locking, and other idioms or patterns that might be considered unsafe or problematic. You can download Checkstyle from http://checkstyle.sourceforge.net. At the root of the Checkstyle distribution you ll find the checkstyle-all-4.0.jar file. Place this file in a directory named checkstyle under the lib directory of the TechConf project directory. The file containing the XML configuration representing the Sun convention is named sun_checks.xml, and it s located under the docs directory of the distribution directory. Copy this file to the lib/checkstyle directory also. Checkstyle writes its output to the standard out by default or to a file in plain text or XML format. The Checkstyle distribution also provides several Extensible Stylesheet Language (XSL) stylesheets that can be used to convert the XML reports to HTML format for easier viewing. You can find these stylesheets in the Checkstyle distribution under the contrib directory. Copy the checkstyle-noframes-sorted.xsl file to the lib/checkstyle directory. To use Checkstyle from within Ant, you first need to load the checkstyle task. As with the Javadoc task we will incorporate the checkstyle task in a macrodef contained in the macros.xml file. First we need to make the checkstyle task available to the macros.xml file by defining a taskdef for it: <path id="checkstyle.class.path"> <fileset dir="lib/checkstyle"> <include name="*.jar"/> </fileset> </path>

fields. This make sense because a particular product can exist only once in a particular shopping cart, so a (cart_id, product_id) pair shouldn t appear more than once in the table.

In this section, you ll create the usual functions that query the database for the shopping cart operation. Before going further with the code, let s review the functions you ll add to the hatshop database: shopping_cart_add_product adds a product to the shopping cart. shopping_cart_update modifies shopping cart products quantities. shopping_cart_remove_product deletes a record from the visitor s shopping cart. shopping_cart_get_products gets the list of products in the specified shopping cart and is called when you want to show the user his shopping cart. shopping_cart_get_saved_products gets the list of products saved in the shopping cart to buy later and is called when the user requests to view the shopping cart details page. shopping_cart_get_total_amount returns the total costs of the products in the specified product cart.

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