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Hopefully, after reading the arguments presented in 6, you are convinced of the importance of using a PL/SQL API for the database access layer in your JDBC applications (For a non-Oracle database, you would use the corresponding procedural language layer here for example, for SQL Server, you would use a TransactSQL layer API) It is vital for your application to not lump all of these schemas into one, otherwise you violate both the principle of least privilege and defense in depth For example, consider the case where you have just one user for the data (the tables), the data access layer (the procedures and packages that manipulate the data in the tables), and the end user database account.

If your application security is compromised and a malicious end user is able to connect to the database using this all-in-one database account, he can potentially delete data from the tables, drop schema objects, and take all kinds of similar destructive actions Contrast this with the case where you have a design in which the end user account does not own the data or the data access layer, but just has execute privileges on the procedural API that the user indirectly executes when logged in as the application user (through the application) In this case, the user can perform none of the aforementioned destructive actions, simply because he has not been granted the privileges to do so Thus, ideally we should have a separate database schema for the end user, data access layer, and data database accounts, as shown in Figure 15-1..

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And we also create a new content page based on this master page called ContentPage.aspx with the following code:

Data access layer (PL/SQL)

As illustrated in Figure 15-1, the data schema owns the tables and the data within these tables. The data access layer contains PL/SQL code to manipulate data. The PL/SQL packages in this schema have privileges to insert, delete, update, and select data as required on appropriate tables they need to work on. The end user accounts are given privileges only to execute the PL/SQL packages they need to execute to get their job done. In the next section, we ll look at an application example that illustrates the concepts we ve covered so far.

Figure 15-2 shows our example application architecture. Application users clerk1 and manager1 map to the database schemas db_clerk1 and db_manager1, respectively. The schema db_data_access_layer consists of PL/SQL code with privileges to manipulate data stored in a third schema called db_app_data. The schema db_clerk1 has the role clerk_role, which can execute the package clerk_pkg. The user db_manager1 has the role manager_role, which can execute the packages clerk_pkg and manager_pkg.

<%@ Page Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="ContentPage.aspx.cs" Inherits="ContentPage" Title="Sample Page" %> <asp:Content ID="Content1" ContentPlaceHolderID= "ContentPlaceHolder1" runat="server"> </asp:Content>

db_manager1 manager_role can execute clerk_pkg and manager _pkg clerk_role can only execute clerk_pkg

Figure 15-2. Our example application architecture Our rather simplistic HR application consists of two PL/SQL packages that allow a user to perform various actions on the emp and dept tables. The package manager_pkg allows a user to add a department, hire an employee, raise a salary, and so on. The package clerk_pkg allows a user to list the employee and department details.

If you run the ContentPage.aspx page and look at the output, as expected you will see the same general output that is generated by the ScriptManager control from the master page consisting of the three main script blocks (among others) pointing to the WebResource.axd and ScriptResource.axd as shown here:

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