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Transaction management is an essential technique in enterprise application development to ensure data integrity and consistency. Without transaction management, your data and resources may be corrupted and left in an inconsistent state. Transaction management is particularly important for recovering from unexpected errors in a concurrent and distributed environment . In simple words, a transaction is a series of actions that are treated as a single unit of work. These actions should either complete entirely or take no effect at all. If all the actions go well, the transaction should be committed permanently. In contrast, if any of them goes wrong, the transaction should be rolled back to the initial state as if nothing had happened. The concept of transactions can be described with four key properties: atomicity, consistency, isolation, and durability (ACID). Atomicity: A transaction is an atomic operation that consists of a series of actions. The atomicity of a transaction ensures that the actions either complete entirely or take no effect at all. Consistency: Once all actions of a transaction have completed, the transaction is committed. Then your data and resources will be in a consistent state that conforms to business rules. Isolation: Because there may be many transactions processing with the same data set at the same time, each transaction should be isolated from others to prevent data corruption. Durability: Once a transaction has completed, its result should be durable to survive any system failure (imagine if the power to your machine was cut right in the middle of a transaction s commit). Usually, the result of a transaction is written to persistent storage.

You may ask yourself why you need to worry about this if you re going to drag and drop the bullet graph control and set its width and height explicitly In that scenario, you would be correct However, imagine if a designer places the bullet graph control in a list box that is dynamically stretched The width and height values would not be updated, and the math calculations would either error or cause incorrect values Therefore, retrieving the ActualWidth and ActualHeight dimensions after the Silverlight rendering process has determined the place of the control is quite important..

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To understand the importance of transaction management, let s begin with an example about purchasing books from an online bookshop. First, you have to create a new schema for this application in your database. If you are choosing Apache Derby as your database engine, you can connect to it with the JDBC properties shown in Table 16-1. For the examples in this book, we re using Derby 10.4.2.0.

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Open up the BulletGraph.xaml file. In the UserControl element, add SizeChanged event. This will create a UserControl_SizeChanged event handler in the codebehind. You should now have an event handler as shown in Listing B-6. Listing B-6. The UserControl_SizeChanged Event that Hosts the Main Layout Content public BulletGraph() { InitializeComponent(); } private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e) { } Now that you know you will place your dynamic layout code in the SizeChanged event handler, it s time to add the quantitative scale dynamically. This will be done in two steps. First, create a series of private members that will hold the values that are calculated from the layout. Then, create a method called AddTickMarks() that will be responsible for the math and adding the quantitative scale components. If you look back at any of the sample bullet graphs, you can see the quantitative scale consists of a rectangular tick mark and a label. The implementation is actually quite simple. You will programmatically create a StackPanel control using a vertical orientation. Inside the StackPanel control, a tick mark represented by a rectangle will be added. Directly below the tick mark, a TextBlock will be added that will serve as a label for the tick mark. Figure B-28 illustrates this implementation.

With the preceding configuration, the database will be created for you because of the parameter on the JDBC URL: create=true. For your bookshop application, you need a place to store the data. You ll create a simple database to manage books and accounts. The entity relational (ER) diagram for the tables looks like Figure 16-1.

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