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Okay, let s write some code! You ll start by writing the DatabaseHandler class, which will be a support class that contains generic functionality needed in the other business tier methods. Then you ll create a business tier class named Catalog, which uses the DatabaseHandler class to provide the functionality required by the presentation tier. The Catalog class will contain methods such as GetDepartments (which will be used to generate the list of departments), GetCategories, and so on. The only method we ll need to add to the Catalog class in this chapter is GetDepartments. Although in this chapter we won t need all this functionality, we ll write the complete code of the DatabaseHandler class. DatabaseHandler will have the following methods: Prepare is a wrapper for the PDO::prepare method, which is used to create a prepared statement. Execute executes an SQL command that doesn t return records from the database, such as INSERT, DELETE, or UPDATE statements. GetOne returns a single value from the database. We can use this method to call database functions that return a single value, such as one that returns the subtotal of a shopping cart. * GetRow is used to execute queries that return a single row of data. GetAll is used to execute queries that return more rows of data, such as when requesting the list of departments.

Gender +genderId +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() 0..* +toString()

Actions list, and then click Change General Settings in the General Settings section of the Customize page.

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Assuming your company already has customers, you probably wish that they bought more What stops them If the customers don t want any more of a certain product, there s not a lot that e-commerce can do, but chances are there are other reasons, too: Getting to the shop/placing an order by mail is a hassle Some of the things you sell can be bought from more convenient places You re mostly open while your customers are at work It s harder to implement an efficient product recommendations system in a physical s t o re A quality e-commerce site (because there are so many buggy, insecure, or hard-to-use web sites out there) can fix those problems People with Internet access will find placing an order online far easier than any other method meaning that when the temptation to buy strikes, it s much easier for them to give in.

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Of course, the convenience of being online also means that people are more likely to choose you over other local suppliers Because your site is online 24 hours a day, rather than the usual 9 to 5, your customers can shop with you outside of their working hours Having an online store brings a double blessing to you if your customers work in offices because they can indulge in retail therapy directly from their desks Skillful e-commerce design can encourage your customers to buy things they wouldn t usually think of You can easily update your site to suggest items of particular seasonal interest, to announce interesting new products, or to recommend products similar to what that specific customer has already bought.

To modify a column s name, description, and other properties, click the column in the Columns list on the Customize page of the list (open the list and then click Modify Settings and Columns in the Actions list). Enter changes for the column on the Change Column page that opens.

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Many of the large e-commerce sites encourage customers to buy useful accessories along with the main product or to buy a more expensive alternative to the one they re considering Others give special offers to regular shoppers or suggest impulse purchases during checkout You ll learn how to use some of these methods in later chapters; by the end of the book, you ll have a good idea of how to add more features for yourself Finally, it s much easier to learn about your customers via e-commerce than in face-toface shops, or even mail order Even if you just gather email addresses, you can use these to.

LogicalAssignment +logicalAssignmentId +workerId +logicalWorkplaceId +activeDate +inactiveDate +getId() +getLogicalWorkplace() +getLogicalWorkplace() +getRow() +help() +isActive() +isHistory() +setRow() +test() 0..* 1..1 LogicalWorkplace +logicalWorkplaceId +parentId +idContext +workplaceTypeId +code +name +activeDate +inactiveDate +createIdContext() +getId() +getCodeContext() +getNameContext() +getRow() +help() +setRow() +test() +toString()

send out updates and news. More sophisticated sites can automatically analyze a customer s buying habits to make suggestions on other products the customer might like to buy. Another related benefit of e-commerce is that there s no real cost in having people browse without buying. In fact, getting people to visit the site as often as possible can be valuable. You should consider building features into the site that are designed purely to make people visit regularly; for example, you might include community features such as forums or free content related to the products you re selling.

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