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As you start down the road to role-based management, begin with a list of the roles that can be played by database users in your system. For this section, we will return to our toy store sample schema. After a few minutes of thinking about the different types of users that will have access to the database server, we come up with the following list: Database Administrators Database Users The Database Administrators group (role) is fairly self-explanatory. For our Database Users role, we can further break down the list to the following: Super Users: Users who have access to all databases and can do all simple table-related tasks, as well as have full rights on a database named tmp. Regular Users: Users who have access to specified databases and may do simple tablerelated tasks. Designers: Users who have all database-related access and privileges on some databases (schema). We want to ensure that users belonging to each role (and sub-role) have only the privileges that they need to do their activities, and no more. Also, we re assuming here that Super Users have some general database knowledge and know how to use MySQL, so we ve given them a database (tmp) to use for their own measures. Thus, we put together a matrix to show which global and database level privileges member users should be granted as defaults, as shown in Table 15-8. This kind of table serves as an important written policy to guide database administrators for large projects. This document should be maintained as changes to the account management system are implemented. Table 15-8. Role-Privilege Matrix for the Toy Store Database Server

Kills a thread using the ThreadAbortException. As a rule of thumb, it s better to use message passing to make sure a thread ends politely in response to a cancellation request. If the thread is currently waiting (using synchronization code), blocked, or sleeping, this method puts it back on track. Waits until the thread terminates (or a specified timeout elapses). If the thread calls this method when handling the ThreadAbortException, the exception will not be thrown again and the thread will be allowed to continue living. Returns a thread to life after it has been paused with the Suspend() method. Starts a thread executing for the first time. You cannot use Start() to restart a thread after it ends. Pauses a thread for an indefinite amount of time (until Resume() is called). This method is risky, because the code may be anywhere when you pause it, and it may even be holding onto a lock. It's often better to create your own thread communication mechanisms, so that your threaded code can pause itself (using the Thread.Sleep() method) on request . Pauses the current thread for a specified number of milliseconds. This method is static.

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NONE SELECT, INSERT, UPDATE, DELETE on all schema; ALL on schema called tmp SELECT, INSERT, UPDATE, DELETE on select schema ALL on select schema

Interrupt() Join() ResetAbort()

using System.Configuration;

Resume() Start() Suspend()

Now, we have a working strategy for setting defaults for our system s users based on their roles. You would use a list like the one in Table 15-8 as a reference when making account management changes. Instead of remembering the exact privileges a specific user account should be granted, you need to know only which role a new user will play. Finally, you might streamline the process of account management further, by encapsulating the account management into stored procedures or shell scripts that add appropriate permissions based on these well-defined roles.

using using using using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; Microsoft.Practices.EnterpriseLibrary.Common.Configuration.Unity; Microsoft.Practices.EnterpriseLibrary.Data.Sql; Microsoft.Practices.ObjectBuilder2;

Sleep()

In this chapter, we ve covered a number of topics related to user account management. Here, is a simple list of strategies we consider to be best practices: Grant as few privileges as is absolutely necessary for users to accomplish their daily activities. Avoid using WITH GRANT OPTION. Avoid issuing any global privileges to anyone but the topmost database administrator.6 Keep privileges as simple as possible. If you don t need table or column-level privileges, don t use them. This only slows down the access control system and overcomplicates your setup. Think in terms of role-based management. This will allow you to more effectively manage large groups of users by grouping them by like activities. Use scripts to consolidate role-based management into a secure, well-organized environment.

In the next example, you ll see how to build a threading system for performing an arbitrary number of simultaneous prime-number searches.

namespace Microsoft.Practices.EnterpriseLibrary.Data.Configuration.Unity { public class OracleNETDatabasePolicyCreator : IContainerPolicyCreator { void IContainerPolicyCreator.CreatePolicies( IPolicyList policyList, string instanceName, ConfigurationElement configurationObject, IConfigurationSource configurationSource)

Because the Thread class supports only methods with no parameters and no return value, it s common to put the code you want to execute in a separate class. You can then add properties to that class for the input and output information. A common design in .NET applications is to create a Worker class that encapsulates the code for performing your specific task and the thread object. That way, you don t need to track both the worker and the thread objects separately. Before you create your thread wrapper, it makes good sense to factor out all the threading essentials into a base class. That way you can use the same pattern to create multiple asynchronous tasks without recoding it each time. This approach also gives you the benefit of defining a standard interface. We ll examine the ThreadWrapper base class piece by piece. First of all, the ThreadWrapper is declared abstract so that it can t be instantiated on its own. Instead, you need to create a derived class. public abstract class ThreadWrapper { ... }

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