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namespace TestLayer { [TestFixture] public class UserTests { private StringBuilder connectionString; public UserTests() { // Build connection string connectionString = new StringBuilder("Driver={Microsoft Access Driver (*.mdb)}"); connectionString.Append(";DBQ=c:\\xpnet\\database\Northwind.mdb"); } [SetUp] public void Init() { 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("INSERT INTO Users (UserName, Password"); commandText.Append(" VALUES ('bogususer', 'password')"); dataCommand.CommandText = commandText.ToString(); 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); } }

Finally, you need to specify what exactly you want to do: =: Set and forget about all permissions that have been set before +: Add to the existing permissions -: Remove from the current permissions With all this information, you can create nice commands like chmod u=rw,g+x,o-r ~/file This may make you understand why most administrators prefer working with chmod in absolute mode The only time relative mode is useful is when you want to apply a permission to a file that is valid for everyone You could use, for example, chmod +x ~/bin/myprogram to make the program you have just written executable As an administrator, you certainly want to check the permissions that are set to your files and directories from time to time You can do so with ls l, which shows all permissions listed in relative mode.

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You have seen how you can use application contexts to influence the rules that are enforced by a VPD policy function. When you wish to use application contexts within the APEX environment, you need to be aware of an important factor: The application context is valid only for the duration that the session is alive. The architecture of the APEX environment is that the connection to the database is achieved through the use of the mod_plsql connection pooling. You therefore have no guarantee that the database session that was used to process your last page request will be the same database session that is used to perform your next page request. APEX (and mod_plsql) ensures that the session and state information are set up correctly for each of your page requests, regardless of whether or not you get the same underlying database session connection. However, reestablishing custom application contexts is not handled for you automatically, so you will need to make provisions to handle those yourself.

This could appear in a line like -rw-r--r-- 1 root root 1674 Aug 31 13:54 passwd The first character in this output line from ls l is used to indicate what kind of file it is you re looking at You could find, for example, d to indicate that it s a directory Digits 2, 3, and 4 are used to specify the permissions of the owner of the file Digits 5, 6, and 7 specify the permissions of the group owner, while digits 8, 9, and 10 indicate the permissions for others This means that the owner has read and write, while the group owner has read as well as others The permission executable is not applied to anyone on this file In the output of ls l, just nine characters are reserved to specify the permissions applied to the file.

The easiest way to do this is to have a custom PL/SQL page process, or application process that sets the value of the context on each page request. For example, in the Buglist application, you can change the report page so that it runs an anonymous PL/SQL block as a before header process, as shown in Figure 5-23, which simply executes the vpd_context_procedure and sets the parameter to Open. This way, the application context will be set to Open each time the page is executed.

This means that there is no space reserved for the special permissions If special permissions are applied, you can see that at the position of the execute permission, as shown in Table 4-7 Table 4-7 Various ls l Output.

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