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The echo program is not a final program The echo program is a temporary solution for an intermediate goal When building an application with intermediate goals, you are using an iterative development technique The iterations are not visible to your other team members and are completely private However, the iterations will keep you focused on solving a problem, rather than trying to implement a large piece of code that will not be able to fully test for a while Test-driven development, for the most part, is a bottom-up development approach You develop a core piece of functionality, test it, and then write code that uses the tested piece of functionality But sometimes you need to develop in a top-down fashion I typically develop code top-down when I am trying to nail down an overall architecture The problem with developing top-down is that you don t yet have the bottom code.

In this chapter, you saw how to integrate PayPal into an e-commerce site a simple payment solution that many small businesses choose so they don t have to process credit card or payment information themselves. First we listed some of the alternatives to PayPal, before guiding you through the creation of a new PayPal account. We then covered how to integrate PayPal in stages 1 and 2 of development, discussing a shopping cart, a custom checkout mechanism, and how to direct the visitor straight to the payment page. In the next chapter, we ll move on to look at a catalog administration page for BalloonShop.

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n the previous chapters, you worked with catalog information that already existed in the database. You have probably inserted some records yourself, or maybe you downloaded the department, category, and product information from this book s accompanying source code. Obviously, both ways are unacceptable for a real web site, so you need to write some code to allow easy management of your data. That said, the final detail to take care of before launching a web site is to create its administrative interface. Although visitors will never see this part, it s key to delivering a quality web site to your client. In this chapter and the following one, you ll implement a catalog administration page. With this feature, you ll complete the first stage of your web site s development! Because this page can be implemented in many ways, a serious discussion with the client is required to get the specific list of required features. In our case, we ll implement a control panel that allows managing the site s departments, categories, and products. In this chapter, we ll deal with administering departments and categories, leaving the rest for 12. More specifically in this chapter, we will create features that allow for Adding and removing departments Modifying existing departments information (name and description) Viewing the list of categories that belong to a department Adding and removing categories Editing existing categories information (name and description) To secure the sensitive pages of your site, such as the administrative section, you ll also do the following: Implement a login form where the administrator needs to supply a username and password

In other words, you are writing code with no working code So that your code does have some meaning, you develop an echo The echo solves the problem of working code and allows you to focus on getting the individual pieces to fit together Once the pieces are working, and the echo was successful, you can start filling in the implementations Some developers call the echo a mock implementation..

UNIQUE is yet another kind of constraint that can be applied to table columns. This constraint is similar to the PRIMARY KEY constraint because it doesn t allow duplicate data in a column. Still, there are differences. Although there is only one PRIMARY KEY constraint per table, you are allowed to have as many UNIQUE constraints as you like. Columns with the UNIQUE constraint are useful when you already have a primary key, but you still have columns for which you want to have unique values. You can set Name to be unique in the Department table if you want to forbid repeating values, when the DepartmentID column is the primary key. (We won t use the UNIQUE constraint in this book, but we mention it here for completeness.) We decided to allow identical department names because only site administrators will have the privileges to modify or change department data. The facts that you need to remember about UNIQUE constraints are The UNIQUE constraint forbids having identical values on the field. You can have more than one UNIQUE field in a data table. Unlike with primary keys, a UNIQUE constraint can t apply to more than one field.

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