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paradigm, as mapped statements are not unlike methods. Parameter map names, if used at all, are based on statement names because they have limited reusability. However, result maps are reusable and are therefore named after the type that they map. Choosing which type to map was the focus of the final topic of the chapter. Should you use JavaBeans, maps, or XML in your domain model The answer is clear. You should use JavaBeans for your business object model. Maps and XML suffer from similar disadvantages, including poor performance and lack of type safety, and both can be a maintenance nightmare in the future.
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This chapter covers
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Choosing tools Setting up your project Wiring components together
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iBATIS is not an island unto itself it is meant to be part of a whole. iBATIS can be used in conjunction with any application that accesses a SQL database. Given that there are a lot of different applications that may access a SQL database, we ll focus on one popular type. Web applications are well known and usually access a SQL database somewhere behind the scenes. To put iBATIS into a useful context, we will walk through the creation of a shopping cart application. We tried to come up with something original, so we decided to make it a game store rather than a pet store. Let s move ahead with putting this application together.
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14.1 Design concept
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It s always good to begin writing an application with some sense of direction. A good overview of what we want an application to accomplish is important. Another term for this is requirements. Shopping carts are an easy concept to delineate requirements for because they have been done many times. Tiresome as it may be, we will do the same thing for this round. (Hey, at least it s not a pet store!) We are going to keep the design of this shopping cart simple and focus our efforts on the design of four major parts: the account, the catalog, the cart, and the order. We ll forgo any management portions to the application, as those add significant time and complexity to the requirements while adding little to the bottom line of this book. With the group of application components defined, let s now provide some details on each of their requirements.
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14.1.1 Account
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The account will house information relevant to a user. An account will contain personal address information and preferences. The user should be able to create and edit an account. The account will also handle security for customer logins.
14.1.2 Catalog
The catalog will house a significant number of the pieces we need to code. The category, product, and item will be utilized here. The category, product, and item will be only one level deep and will contain products. A product will then contain items. Items are variations of the product. For example, a category named Action would contain a game/product like Doom. The game/product would then contain items like PC, PlayStation, XBox, and similar variations.
Choosing technologies
14.1.3 Cart
The cart will be used to maintain a user's product selections. The cart should tally up the current items that are in the cart in preparation for the order.
14.1.4 Order
The order portion of the application will be used for checkout. Once the customer has made all of their item selections and wants to purchase the items, they will select checkout from the cart. The cart will take them through a process of confirmation, payment, billing, shipping, and final confirmation. Once the order is completed, it will be viewable by the user in their order history.
14.2 Choosing technologies
Now that we have derived some perspective on our requirements, we need to make some decisions about what technologies we will use to meet the required functionality. Since this is a web application, we will look at options for different layers. The standard web application can be broken into a few pieces:
The presentation layer, the portion of the application that is web specific The service layer, where most of our business rules will exist The persistence layer, where we will deal with elements specific to database access
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