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namespace TestLayer { [TestFixture] public class UserTests { public UserTests() { } [SetUp] public void Init() { } [TearDown] public void Destroy() { } [Test] public void TestGetUser() { UserData userData = new UserData(); Assert.IsNotNull(userData.GetUser("bogususer", "password"), "GetUser returned a null value, gasp!"); } } } If you build the solution now, you will get several errors because your web application does not have a concept of a UserData class. To address that issue, you will need to define a minimal UserData class so you can successfully build but not pass the test. Listing 13-2 shows the minimal UserData.cs file that needs to be added to the DataLayer project. You will need to add a reference to the BusinessLayer project on the DataLayer project, if you have not done so already. Listing 13-2. Minimal UserData.cs File #region Using directives using System; using System.Collections.Generic; using System.Text; using BusinessLayer; #endregion

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The policy function needs to accept two VARCHAR parameters: one for the schema owner and the other for the object name. The function also needs to return a VARCHAR string, which is the string to be used in the new predicate. The function prototype should look like this: function policy_function_name(owner in varchar2, object_name in varchar2) return varchar2 If you again connect as the APEXDEMO user in SQL*Plus (since you are protecting the data in that schema), you can create a simple function that returns the string you need, as shown in Listing 5-4. Listing 5-4. Creating the Policy Function apexdemo@DBTEST> create or replace function vpd_buglist( 2 p_schema in varchar2 default null, 3 p_object in varchar2 default null) 4 return varchar2 as 5 begin 6 return '( 7 upper(assigned_to) = nvl(v(''APP_USER''), USER) 8 or 9 exists (select 1 from user_repository 10 where upper(username) = nvl(v(''APP_USER''), USER) 11 and admin = ''Y''))'; 11 end; 12 / Function created. This function simply returns a string, but notice that you must change the string slightly from the string you used in the original report query: instead of using :APP_USER to determine the username, you use nvl(v('APP_USER', USER). This is because :APP_USER will return only the username when the user has connected to the database via the APEX application. For the policy function to correctly determine the username when the user is connected via SQL*Plus (or some other application where the user connects as a database user), you need to use the USER function. The nvl(v('APP_USER'), USER) determines if the v('APP_USER') is a non-null value; that is, the user is connected via an APEX application. If so, you will use the value returned by v('APP_USER'). If not, you will use the value returned by USER.

With Open Enterprise Server, Novell offers a very versatile server platform running many services on either the NetWare or Linux operating systems. Amongst the most important of these services are the file services and the directory service eDirectory. In the next chapter, you ll read about how to install Open Enterprise Server.

Now that you have defined your policy function, you need to apply it to the buglist table, by using the DBMS_RLS package. You use DBMS_RLS to link the policy you just defined to a particular schema object. First, grant the execute permission on DBMS_RLS to the APEXDEMO user: sys@DBTEST> grant execute on dbms_rls to apexdemo; Grant succeeded. Next, connect again as the APEXDEMO user and add the policy against the buglist table, as shown in Listing 5-5. Listing 5-5. Applying the Policy Using DBMS_RLS apexdemo@DBTEST> begin 2 dbms_rls.add_policy( 3 object_schema => 'apexdemo', 4 object_name => 'buglist', 5 policy_name => 'Buglist Policy', 6 function_schema => 'apexdemo', 7 policy_function => 'vpd_buglist', 8 statement_types => 'select'); 9 end; 10 / PL/SQL procedure successfully completed. You apply the policy using the DBMS_RLS.ADD_POLICY procedure, which accepts a number of different parameters that allow you to define the schema and object name to which you wish to apply the policy, as well as the schema and function that you wish to apply. Note that in this example, for simplicity, the policy function is defined in the same schema that contains the objects that you re trying to protect. In practice, this is not recommended, as explained in the VPD Best Practices section later in this chapter. It s better and safer to define your policy functions in schemas separate from your data.

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