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int rows = dataCommand.ExecuteNonQuery(); // Make sure that the INSERT worked Assert.AreEqual(1, rows, "Unexpected row count returned."); dataConnection.Close(); } catch(Exception e) { Assert.Fail("Error: " + e.Message); } } [TearDown] public void Destroy() { try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = connectionString.ToString(); dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("DELETE FROM Users WHERE username='bogususer'"); dataCommand.CommandText = commandText.ToString(); int rows = dataCommand.ExecuteNonQuery(); // Make sure that the DELETE worked Assert.AreEqual(1, rows, "Unexpected row count returned"); dataConnection.Close(); } catch(Exception e) { Assert.Fail("Error: " + e.Message); } }

4. Select the Lock Account After Detection option and an account will be locked after a user has logged in with the wrong password too many times. You ll see that the default lockout period is just 15 minutes! After that, the intruder can start all over again! Many administrators prefer to set this to a much longer period, like 99 days. This way an administrator will always know if a user has tried to log in too many times with the wrong password. Click OK to save and apply the settings.

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Figure 1-11. Defining the alias to reference the APP_IMAGES substitution string Effectively, this creates a substitution string that references a substitution string itself. At runtime, this will be expanded to reference the same download procedure that was used before. The advantage of using this technique is that if you later decide to store the static files on the file system, rather than storing them within the database, you can simply change the value of your substitution string to reflect the new location, Figure 1-12 shows the substitution string modified to use a reference to the file system instead.

Note You can see it on the user object if intruder detection has locked an account. You can also find this

Figure 1-12. Changing the substitution string value to use the file system This will greatly reduce the number of references you will need to change when moving your application between different APEX environments where the static files are stored in different locations, Figure 1-13 shows how the substitution string would be set in the development environment.

in your server s log files. Since all admins should regularly check these files, it s hard to miss an intruder detection event.

[Test] public void TestGetUser() { UserData userData = new UserData(); Assert.IsNotNull(userData.GetUser("bogususer", "password"), "GetUser returned a null value, gasp!"); } [Test] public void NegativeTestGetUser() { UserData userData = new UserData(); Assert.IsNull(userData.GetUser("", ""), "GetUser did not return a null value, gasp!"); } } } Rebuild the solution and run the test again. This time two tests should run, and both should pass successfully. Let s move on to the Create Login Screen task for the Login user story.

Whereas your previous policy function applied to the entire row regardless of which columns the user was selecting, you can actually configure a policy that is applied only if the user is attempting to access certain columns. As an example, you will set up the policy function so that the jimb user is able to see all of the rows in the table unless he attempts to select the assigned_to field; in that case, he will be able to see only the rows assigned to him. So, as before, you need to create a policy function and then link it to the table using the DBMS_RLS package. First, let s drop the old policy: apexdemo@DBTEST> begin 2 dbms_rls.drop_policy(object_name => 'buglist', 3 policy_name => 'Buglist Policy'); 4 end; 5 / PL/SQL procedure successfully completed. Now re-create the policy function as a much simpler one that just checks that the record is assigned to the user, as shown in Listing 5-14. Listing 5-14. Creating the New 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 if (USER = 'APEXDEMO') and (v('APP_USER') is null) then 7 return ''; 8 else 9 return 'upper(assigned_to) = nvl(v(''APP_USER''), USER)'; 10 end if; 11 end; 12 / Function created. Like the previous policy function, this function checks to see if the user is connected as the Oracle user APEXDEMO. If so, it returns an empty string; otherwise, it returns a string that will compare the assigned_to column with the logged-in user, whether the user is logged in via an APEX application or as an Oracle user. You can now apply the policy function using the DBMS_RLS.add_policy procedure, as shown in Listing 5-15.

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