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When you interact with a data source through ADO.NET, you use SQL to retrieve, modify, and update information. In some cases, ADO.NET will hide some of the details for you or even generate required SQL statements automatically. However, to design an efficient database application with a minimal amount of frustration, you need to understand the basic concepts of SQL. SQL (Structured Query Language) is a standard data access language used to interact with relational databases. Different databases differ in their support of SQL or add other features, but the core commands used to select, add, and modify data are common. In a database product such as SQL Server, it s possible to use SQL to create fairly sophisticated SQL scripts for stored procedures and triggers (although they have little of the power of a full object-oriented

You can also define your own exception objects to represent custom error conditions. All you need to do is create an instance of the appropriate exception class and then use the throw statement. The next example introduces a modified DivideNumbers() method. It explicitly checks whether the specified divisor is 0 and then manually creates and throws an instance of the DivideByZeroException class to indicate the problem, rather than attempt the operation. Depending on the code, this pattern can save time by eliminating some unnecessary steps, or it can prevent a task from being initiated if it can t be completed successfully.

s Note You could use a Tempfile object, which automates the unlinking behavior, but you can t specify a

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protected void Page_Load(Object sender, EventArgs e) { try { DivideNumbers(5, 0); } catch (DivideByZeroException err) { // Report error here. } } private decimal DivideNumbers(decimal number, decimal divisor) { if (divisor == 0) { DivideByZeroException err = new DivideByZeroException(); throw err; } else { return number/divisor; } } Alternatively, you can create a .NET exception object and specify a custom error message by using a different constructor: private decimal DivideNumbers(decimal number, decimal divisor) { if (divisor == 0) { DivideByZeroException err = new DivideByZeroException( "You supplied 0 for the divisor parameter. You must be stopped."); throw err; } else { return number/divisor; } } In this case, any ordinary exception handler will still catch the DivideByZeroException. The only difference is that the error object has a modified Message property that contains the custom string. Figure 8-5 shows the resulting exception.

Figure 8-5. Standard exception, custom message Throwing an exception is most useful in component-based programming. In componentbased programming, your ASP .NET page is creating objects and calling methods from a class defined in a separately compiled assembly. In this case, the class in the component needs to be able to notify the calling code (the web application) of any errors. The component should handle recoverable errors quietly and not pass them up to the calling code. On the other hand, if an unrecoverable error occurs, it should always be indicated with an exception and never through another mechanism (such as a return code). For more information about component-based programming, refer to 23. If you can find an exception in the class library that accurately reflects the problem that has occurred, you should throw it. If you need to return additional or specialized information, you can create your own custom exception class. Custom exception classes should always inherit from System.ApplicationException, which itself derives from the base Exception class. This allows .NET to distinguish between two broad classes of exceptions those you create and those that are native to the .NET Framework. When you create an exception class, you can add properties to record additional information. For example, here is a special class that records information about the failed attempt to divide by zero: public class CustomDivideByZeroException : ApplicationException { // Add a variable to specify the "other" number. // This might help diagnose the problem. public decimal DividingNumber; }

Shale is the next generation of the wildly popular (though now essentially legacy) Struts application framework. Essentially Shale is a set of services built on top of JSF. Shale adds Spring and Apache Commons Validator integration, annotation support for configuring managed beans, converters, renderers, Ajax extensions, Tapestry-like views via Clay, and also Web Flow. Shale s Web Flow is modeled after Spring s Web Flow, which allows you to configure wizard-like dialogs. You can define states, transitions, and subdialogs to quickly and easily create thick, client-like wizards.

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