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Generally, the architecture refers to splitting each piece of the application s functionality into separate components based on what they do and grouping each kind of component into a single logical tier. Almost every module that you ll create for your site will have components in these three tiers from the application server: The presentation tier The business tier The data tier The presentation tier contains the user interface elements of the site and includes all the logic that manages the interaction between the visitor and the client s business. This tier makes the whole site feel alive, and the way you design it has a crucial importance for the site s success. Because your application is a web site, its presentation tier is composed of dynamic web pages. The business tier (also called the middle tier) receives requests from the presentation tier and returns a result to the presentation tier depending on the business logic it contains. Almost any event that happens in the presentation tier usually results in the business tier

In practice, data is rarely deleted from a relational database when compared to how much is input, updated, and queried. Regardless, you should know how to delete data. With DELETE however, you need to do things backwards.

7 takes what you learned in the first six chapters and puts it to use. In this chapter, we demonstrate two commonly needed business solutions: tracking issues related to a project and displaying sales performance data. Even if you don t have a specific need for these scenarios, these chapters will show you how to take a business problem and combine the functionality of SharePoint and Excel to develop a comprehensive solution.

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being called (except events that can be handled locally by the presentation tier, such as simple input data validation, and so on) For example, if the visitor is doing a product search, the presentation tier calls the business tier and says, Please send me back the products that match this search criterion Almost always, the business tier needs to call the data tier for information to be able to respond to the presentation tier s request The data tier (sometimes referred to as the database tier) is responsible for managing the application s data and sending it to the business tier when requested For the HatShop e-commerce site, you ll need to store data about products (including their categories and their departments), users, shopping carts, and so on.

So you don t think Hugh Darwen is a genius Well I do, but for the sake of our tutorial, let s say we want to delete his entries from the database. Since we created an integrity constraint on the publication table (a foreign key), we need to delete Darwen s publications before we delete him from the author table. Listing 1-20 is the DML to delete Darwen s entries from the publication table. Listing 1-20. DML to Delete Darwen s Publications, publication_300.del 1 2 DELETE FROM publication WHERE id = 300; The syntax for the DELETE statement used in Listing 1-20 is as follows: DELETE FROM <table_name> WHERE <column_name_N> = <column_value_N>...; where <table_name> is the name of the table to DELETE FROM, and <column_name> is one or more columns for which you specify some criteria. Did you happen to notice that I didn t include a COMMIT statement We will wait until you re finished with your part first.

Almost every client request finally results in the data tier being interrogated for information (except when previously retrieved data has been cached at the business tier or presentation tier levels), so it s important to have a fast database system In s 3 and 4, you ll learn how to design the database for optimum performance These tiers are purely logical there is no constraint on the physical location of each tier In theory, you are free to place all of the application, and implicitly all of its tiers, on a single server machine, or you can place each tier on a separate machine if the application permits this 17 explains how to integrate functionality from other web sites using XML Web Services XML Web Services permit easy integration of functionality across multiple servers.

Now that I ve deleted the publications, it s time for you to delete the author. 1. Write the DML script without a COMMIT statement. 2. Save the DML script with the same filename as your table name, suffix it with _300, and then add a .del extension. 3. Execute your script in SQL*Plus. Darwen should no longer be in the database. Listing 1-21 shows how I got rid of him.

Excel s Web Query is a powerful query tool that allows you to query any accessible table on an intranet or the Internet, including tables and lists in SharePoint. This chapter shows you how to develop useful web queries of SharePoint data. If you re managing a number of internal or external Windows SharePoint Services sites, you ll find this chapter especially useful. In this chapter, you ll see how you can use Web Query to track users on up to 255 sites in one workbook. If you re responsible for removing contractors or employees who have left the company, this is an invaluable tool.

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