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In typical ASP.NET 2.0 applications, if you do a postback on the web page, the entire page will be rerendered. This causes a blink or a flash in the client or browser. On the server, the postback is detected, which triggers the page life cycle. This ends up raising the specific postback event handler code for the control that caused the postback, and this calls upon the page s event handler. When you use UpdatePanel controls along with a ScriptManager control, you eliminate the need for a full-page refresh. The UpdatePanel control is similar to a ContentPanel control in that it marks out a region on the web page that will automatically be updated when the postback occurs (but without the aforementioned postback behavior on the client). It instead communicates through the XMLHttpRequest channel in true AJAX style. The page on the server still handles the postback as expected and executes, raising event handlers, and so on, but the final rendering of the page means that only the regions specified in the UpdatePanel control s regions are created. Also, unlike the ScriptManager, you can actually have multiple UpdatePanel controls on the same page and even have nested UpdatePanel controls within one another.

However, the same user can access the package clerk_pkg: db_clerk1@ORA10G> desc clerk_pkg FUNCTION LIST_DEPT_DETAILS RETURNS REF CURSOR Argument Name Type ------------------------------ ----------------------P_DEPT_NO NUMBER FUNCTION LIST_EMP_DETAILS RETURNS REF CURSOR Argument Name Type ------------------------------ ----------------------P_EMPNO NUMBER

Now that we have gone through the process of creating all the schema objects required, we will use this sample application for demonstration purposes in the remainder of this chapter. In the next section, we will cover some of the challenges while authenticating an application end user to the database.

To use an UpdatePanel control, you simply drag and drop it onto the design surface of your web form (see Figure 5-5).

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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.

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

However, as you know, the UpdatePanel control cannot function without a ScriptManager control on the page. Additionally, the ScriptManager control must be located before any UpdatePanel controls on your page. In other words, as you read your source code from top to bottom, the ScriptManager reference should appear before the UpdatePanel ones. Using the Tasks Assistant will ensure that it is placed correctly. If your ScriptManager control is not present or is incorrectly placed, you ll get an error when you try to open the page in a browser (see Figure 5-6).

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

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.

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