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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.

Figure 6-8. You use the Commands and Options dialog box to format and modify the data displayed in the Spreadsheet component. The Spreadsheet component doesn t support all the features and functionality of Excel. Table 6-1 describes worksheet properties and features that the component doesn t support.

get_code_id_descr()

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.

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If an application is written for a high volume of data entry, the GUI in question will present a field for the entry of a code value and a second field to display the specified code s description value. The users may also have an icon they can click to see a pop-up list of code values from which to select. The typical end-user action in this design is for the end user to specify all or part of a code value, and then to tab into the next modifiable field, at which point, the presentation layer validates the user s code value entry. That s what this method is for: validation. In order to validate a code value, simply pass the code value to PROCEDURE get_code_id_descr(aiov_code, aon_id, aov_description, aid_on). This procedure first tries to find an exact code value match for the specified point in time. If it does not find a match, the

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.

Comments Conditional formatting Graphics Group and outline symbols Indented text Links to other worksheets, workbooks, and web queries Outlined ranges Precedent and dependent arrows Print settings, including rows to repeat, columns to repeat, and print area Rotated text Shared workbook information Validation rules and error alerts

procedure tries to find a single LIKE match. If it does not find a single LIKE match, it may return a NO_DATA_FOUND or TOO_MANY_ROWS exception, which the presentation layer will need to handle. Both exceptions mean that the user has specified an invalid code value. Here s an example from code table package WORKER_TYPE_TS: PROCEDURE get_code_id_descr( aiov_code aon_worker_type_id aov_description aid_on v_code

WORKER_TYPE_T.code%TYPE, WORKER_TYPE_T.worker_type_id%TYPE, WORKER_TYPE_T.description%TYPE, WORKER_TYPE_T.active_date%TYPE ) is WORKER_TYPE_T.code%TYPE;

shopping_cart_save_product_for_later saves a product to a shopping cart for later purchase. shopping_cart_move_product_to_cart moves a product from the Save for Later list back to the main shopping cart. Now let s create each method one at a time in the following exercise.

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