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Logical State The logical state of the database is a representation of the business environment In the banking transfer example, the logical state of the data store can be viewed in terms of Jane Doe s aggregated account balance; that is, the sum of her checking and savings accounts If the balance of Jane s checking account is $1,000 and the balance of her savings account is $1,000, the logical state of the data store can be said to be $2,000 To maintain the logical state of the data store, this state must be consistent before and after the execution of the transaction If a failure occurred after the deduction of her checking account and before the corresponding increase to her savings account, the transaction processing system must ensure that it returns the state of the data store to be consistent with its state before the failure occurred.

When a key event fires, you can test to see if a modifier key (like Ctrl, Alt, or Shift) is being held down. Here s the code you need: private void txt_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { // You can use Modifiers to check for Alt, Control, and Shift. if ((e.Modifiers & Keys.Shift) == Keys.Shift) { lbl.Text += "\n" + "Shift was held down."; } // There is also an easier approach through the Alt, Control, // and Shift properties. if (e.Alt) { lbl.Text += "\n" + "Alt was held down."; } } To test the state of the Caps Lock, Scroll Lock, and Num Lock keys, you can use the static Control.IsKeyLocked method, which is new in .NET 2.0. Here s an example:

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The consistency of the logical state is managed by both the transaction processing system and the rules and actions of the underlying application Clearly, if a poorly coded transaction leaves the data store in an inconsistent logical state after the transaction has been committed to disk, it is the responsibility of the application code, not the transaction processing system Physical State The physical state of the database refers to how database servers keep a copy of the data store in memory and a copy of the data store on disk As we discussed in the previous chapter, the database server operates on data stored in local memory When reading data, the server requests the needed data page from a buffer pool in memory If the data page exists in memory, it uses that in-memory data.

Figure 15-4. Creating a data source In the next window, you will be required to select a data connection to use for the data source. Choose the data connection that you ve created in the previous chapter (as shown in Figure 15-5).

if (Control.IsKeyLocked(Keys.CapsLock)) { // Caps lock is enabled. } The Control.IsKeyLocked method accepts a member from the Keys enumeration. However, you can t test for any key other than Caps Lock, Scroll Lock, and Num Lock. Otherwise, a NotSupportedException will be thrown.

Tip You don t need to wait for an event to fire you can use the Control.IsKeyLocked property at any time. If you want to check the state of a modifier key like Shift, Ctrl, or Alt outside of an event handler, just check the Control.ModifierKeys property in the same way that you would check the KeyEventArgs.Modifiers property. This is particularly useful when dealing with controls that don t provide a KeyDown event.

If not, it requests that the operating system read the page from secondary storage (disk storage) into memory, and then reads the data from the in-memory buffer pool Similarly, when the database server needs to write data, it first accesses the in-memory data page and modifies that copy of the data, and then it relies on the operating system to flush the pages in the buffer pool to disk..

The Data Source Configuration Wizard can also save the connection string automatically in the app.config file of your project. This gives users the flexibility of changing their connection strings later from the app.config file. Select the Yes, save the connection as option, and give the connection string entry a name. In the sample screenshot shown in Figure 15-6, I use the name MyOracleConnection.

Unfortunately, the Control.IsKeyLocked method won t help you determine if the Insert key is pressed. If you want to make this determination (which is common if you re building a text input control like a text box), you need to make an unmanaged call to the GetKeyState() function. Here s how you define it: [DllImport("User32.dll")] private static extern short GetKeyState(System.Windows.Forms.Keys key); And here s how you can check for the current state of the Insert key: if (GetKeyState(Keys.Insert) == 1) { // Overwrite mode is on. } else { // Insert mode is on. }

Note Flushing data means that the database server has told the operating system to actually write the

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