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Before starting to write the code for the shopping cart, let s take a closer look at what you re going to do. First, note that you won t have any user personalization features at this stage of the site. It doesn t matter who buys your products at this point, you just want to know what products were sold and when. When you add user customization features in the later chapters, your task will be fairly simple: when the visitor authenticates, the visitor s temporary (anonymous) shopping cart will be associated with the visitor s account. Because you work with temporary shopping carts, even after implementing the customer account system, the visitor isn t required to supply additional information (log in) earlier than necessary. Probably the best way to store shopping cart information is to generate a unique cart ID for each shopping cart and save it on the visitor s computer as a cookie. When the visitor clicks the Add to Cart button, the server first verifies whether the cookie exists on the client computer. If it does, the specified product is added to the existing cart. Otherwise, the server generates another cart ID, saves it to the client s cookie, and then adds the product to the newly generated shopping cart. In the previous chapter, you created the componentized templates by starting with the presentation layer components. However, this strategy doesn t work here because now you need to do a bit more design work beforehand, so we ll take the more common approach and start with the database tier.

Figure 6-7. The Spreadsheet component toolbar provides spreadsheet functionality in a browser window.

get_code_descr()

You will store all the information from the shopping carts in a single table named shopping_cart. Follow the next exercise to create the shopping_cart table.

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Once you ve decided to use a database architecture where every assigned code value is stored as an ID value, you ll need some way to retrieve the code and description values so they can be displayed in the presentation layer, whether it is for data entry or reporting. And that s the purpose of this method. If you need the code and description values for a specific ID value, you simply call PROCEDURE get_code_descr(ain_id, aov_code, aov_descr), passing it the corresponding ID value. The method returns the code and description values as OUT parameter values. If the ID you specify does not exist, the underlying singleton SQL SELECT statement raises a NO_DATA_FOUND exception, which you must handle in your calling program unit. Here s an example of the method from code table package WORKER_TYPE_TS: PROCEDURE get_code_descr( ain_worker_type_id aov_code aov_description

Two buttons aren t standard in Excel: the Export To Excel button and the Commands and Options button. The Export To Excel button, familiar to SharePoint users, creates the Excel worksheet in a user-specified folder so users can manipulate a copy of the data as much as they wish without changing the original data in the web page. The Commands and Options button opens the Commands and Options dialog box, which includes additional user tools (see Figure 6-8). Make sure your users know about this dialog box, because it s filled with power: the power to change the format of a worksheet, work with formulas in the worksheet, find worksheet data, and change worksheet and workbook options.

WORKER_TYPE_T.worker_type_id%TYPE, out WORKER_TYPE_T.code%TYPE, out WORKER_TYPE_T.description%TYPE ) is

1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the shopping_cart table in your hatshop database: -- Create shopping_cart table CREATE TABLE shopping_cart ( cart_id CHAR(32) NOT NULL, product_id INTEGER NOT NULL, quantity INTEGER NOT NULL, buy_now BOOLEAN NOT NULL DEFAULT true, added_on TIMESTAMP NOT NULL, CONSTRAINT pk_cart_id_product_id PRIMARY KEY (cart_id, product_id), CONSTRAINT fk_product_id FOREIGN KEY (product_id) REFERENCES product (product_id) ON UPDATE RESTRICT ON DELETE RESTRICT );

begin select code, description into aov_code, aov_description from WORKER_TYPE_T where worker_type_id = ain_worker_type_id; end get_code_descr; Once again, after this method is written and in use, one and only one SQL statement need ever be written to retrieve a code and description for a specified code ID value. Similar functions can be written to get just the code value or description value, and they would be appropriately named get_code() and get_descr().

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