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In a three-tier architecture typically used by web applications, an end user has to necessarily authenticate herself to the application before carrying out any action. The application in turn has to log into the database on behalf of the end user. For an application to authenticate to the database on behalf of the end user, we will cover the following alternatives: The application supplies the end user s password to the database. In this case, the end user supplies the database password of her corresponding database user to the application, and the application uses this password to authenticate to the database on behalf of the end user. In our example application, the end user clerk1 would log in as db_clerk1, supplying the database password for the schema db_clerk1. The application uses proxy authentication. In this case, the application can log into the database using its own account on behalf of the end user without supplying the end user s database password. This feature of the Oracle database is called proxy authentication. Though this feature may seem not very secure at first glance, you ll soon see that this is a perfectly secure way of connecting to the database. We ll look at these two alternatives in the sections that follow.

In your pivot table, the Region and City fields are in the Row Labels area. You want to use a different font size for the Region subtotals, and you d like to select and format all the subtotals at the same time, instead of formatting each one separately. This example is based on the Regions.xlsx workbook.

event EventHandler OnMyEvent; Event Sub OnMyEvent() java.reflect.Method OnMyEvent; TMyEvent = procedure() of object; OnMyEvent: TMyEvent;

Note Two other alternatives for an application to authenticate to the database are authenticating against

Figure 7-20. A named output pin associated with a PC signal Don t name output pins that call through a dynamically initialized interface reference. Instead, draw the pins inside a gray interface box, as shown in Figure 7-21.

a centralized LDAP directory and authenticating using certificates. Coverage of these techniques is beyond the scope of this book.

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If the subtotals are at the bottom of the group, in either the Row Labels area or the Column Labels area, you can select them all, and then format them together. To select them, you may have to activate the Enable Selection option. 1. Select a cell in the pivot table, and on the Ribbon, click the Options tab. 2. In the Actions group, click Select, and then check to see if Enable Selection is activated (see Figure 4-7).

Figure 7-21. Output pins calling through an interface reference The interface box is labeled formatter:IFormatter. The first word is the name of the variable exposed by ReportPrinter; the second word is the type of the variable. The names of the signals emerging from the output pins must be the names of the methods called through the given interface. Figure 7-22 shows the ReportPrinter object connected to an object implementing the IFormatter interface.

I discuss this alternative mainly to explain why the proxy authentication feature was invented in the first place. In this approach, the application presents to the database the actual end user s password. This works fine for client/server applications that need to support a small number of dedicated connections for a relatively small user-community. In the context of a three-tier web application, however, this approach has the following drawbacks: Most application servers today have built-in authentication mechanisms, such as the use of a central directory service for storing user credentials, which obviate the need for applications to know or use the database password of the end user account. It is not uncommon for the same user to access different applications running on the application server. If each application has a different database account for the user, the user would have to sign on separately whenever he wants to switch to a new application. The single sign-on feature available in most application servers today is designed to solve this problem. Using single sign-on, the user authenticates once to the application server and is able to access multiple applications hosted on the application server without logging into each one of them separately. Figure 15-3 illustrates this concept.

Figure 7-22. Connecting signals from output pins calling through an interface reference When useful, you can show that the pins exposed by ReportFormatter belong to the IFormatter interface by adding a gray interface box to ReportFormatter, as shown in Figure 7-23.

Figure 15-3. A user accesses multiple applications but authenticates (or signs on) only once to the application server using the single sign-on feature. Security is undermined if the application stores the end user s password. For example, if the application code has the password, then it is trivial to extract the passwords in many cases (e.g., using the strings utility found in most UNIX operating system variants). Every time there is a change in a user s password in the database, all applications that access the username and password have to be modified as well, leading to maintenance problems.

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