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Figure 3-1. Adding a reference to the Oracle.DataAccess (ODP.NET) library You will also need to import the Oracle.DataAccess.Client namespace into your form. You can do that using the following code: using Oracle.DataAccess.Client; Drag a button control to the main form in your project, and name it btnConnectNow. In the Click event handler of this button, write the code shown in Listing 3-1. Listing 3-1. Connecting to the Oracle Database Via TNS

Gets the component (in this case, the custom control) that this designer is designing. Gets the design-time verbs (commands that are exposed through a context menu) when you right-click on the control. You can override this method to supply custom commands. Performs the default action for this designer. This is called when the control is double-clicked on the design surface, and you can override this method to customize this behavior. Initializes the designer for the appropriate component. You can override this method to perform your own custom design-time initialization for the control. This initialization takes place immediately after the component is created and its constructor code has executed.

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A set of functions handles the creation of a myriad threads responsible for running the various parts of the server application. These functions are optimized to take advantage of the ability of the underlying operating system resource and process management systems. The process, thread, and resource management subsystem is in charge of creating, monitoring, and destroying threads. Specifically, threads are created by the server to manage the following main areas: A thread is created to handle each new user connection. This is a special thread we ll cover in detail later in the upcoming User Connection Threads and THD Objects section. It is responsible for carrying out both query execution and user authentication, although, as you will see, it passes this responsibility to other classes designed especially to handle those events. A global (instance-wide) thread is responsible for creating and managing each user connection thread. This thread can be considered a sort of user connection manager thread.

DoDefaultAction()

public void btnConnectNow_Click(System.Object sender, System.EventArgs e)

7. This depends on the available hardware; for instance, whether the system supports symmetric multiprocessing.

Initialize()

Fortunately, you ll rarely be forced to create your own from scratch. The .NET Framework provides a basic component designer in the System.ComponentModel.Design. ComponentDesigner class that is provided to all IComponent classes, and a control designer with the System.Windows.Forms.Design.ControlDesigner class that applies to all controls. These classes contain a great deal of functionality and provide many more methods that you can override to plug into different parts of the designer behavior. In addition, there are derived control designers that add support for child control containment and scrolling. Figure 26-1 shows the hierarchy.

{ OracleConnection conn = new OracleConnection(); conn.ConnectionString = "Data Source=NEWDB;User ID=SYSTEM;Password=admin"; try { conn.Open(); conn.Close(); MessageBox.Show("Connection successful!"); } catch (Exception ex) {

A single thread handles all DELAYED INSERT requests separately Another thread handles table flushes when requested by the system or a user connection Replication requires separate threads for handling the synchronization of master and slave servers A thread is created to handle shutdown events Another thread handles signals, or alarms, inside the system Another thread handles maintenance tasks A thread handles incoming connection requests, either TCP/IP or Named Pipes The system is responsible for regulating the use of shared resources through an internal locking system This locking system ensures that resources shared by all threads are properly managed to ensure the atomicity of data Locks on resources that are shared among multiple threads, sometimes called critical sections, are managed using mutex structures MySQL uses the POSIX threads library.

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