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Oracle, like any powerful software, has always carried the unfortunate stigma of being complex, unproductive, and generally difficult to use among .NET developers. Although the Oracle database is clearly a superior product, the tightly knit nature of the Microsoft SQL Server database and the .NET Framework easily made SQL Server the database of choice among developers who were given a choice between the two. ODT.NET is Oracle s answer to this problem. One of the benefits of ODT.NET is that it bridges Oracle s powerful technology with the ease of use that you would expect from Microsoft. Gone are the days when you had to do everything in a tiny command line window. As you ve seen in the previous chapter, ODT.NET is effectively an enterprise database manager tool built right into the Visual Studio IDE, with additional code generation features similar to those available for the SQL Server database. When used together with ODP.NET, you will be able to create .NET applications more productively without even leaving the Visual Studio environment. In this chapter, you will learn a few more features of ODT.NET. You will see how you can achieve better productivity by performing the following tasks within the Visual Studio IDE: Visually designing an Oracle database query Generating strongly typed DataSet objects from Oracle tables Generating UI and data access code for .NET Winforms projects quickly Generating UI and data access code for ASP.NET projects quickly Generating user defined type (UDT) classes from UDT objects and using them directly in your projects

As any of you who work with database servers on a regular basis already know, things that you don t want to happen sometimes do happen. Power outages, disk crashes, that pesky developer who codes a faulty recursive loop all of these occurrences should be seen as potential problems that can negatively affect the integrity of your data stores. We can view these potential problems in two main categories: Hardware failure: When a disk crashes, a processor fails, or RAM is corrupted, and so forth. Software failure or conflicts: An inconspicuous coding problem that causes memory or disk space to run out, or the failure of a specific software component running on the server, such as an HTTP request terminating unexpectedly halfway through execution. In either of these cases, there is the potential that statements running inside a transaction could cause the database to be left in an inconsistent state. The transaction processing system inside the database is responsible for writing data to disk in a way that, in the event of a failure, the database can restore, or recover, its data to a state that is consistent with the state of the database before the transaction began.

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Now, if the user gives focus to this control and presses F1, a pop-up message appears, as shown in Figure 22-6. It remains until the user clicks or presses a key.

You ve seen in the previous chapter that you could run an Oracle query from within the Visual Studio IDE. ODT.NET takes this one step further by allowing you to visually design an SQL query via drag and drop. Visual design is useful in cases where you have large tables with many columns. Sifting through these columns to look for their foreign keys and relationships with other tables without a visual designer can be a messy and troublesome affair. With ODT.NET, you can do that work without leaving the comfort of the Visual Studio IDE. To start designing a query, right-click a connection that you created in the previous chapter. In the pop-up menu, select the New Query menu item, as shown in Figure 15-1.

Figure 22-6. What s This Help There are some quirks with this approach: The Help text is displayed by the mouse cursor, not the actual control. This can be confusing to the user. The Help text can t be formatted in any way (for example, you can t bold command names). It forces the user to understand the rather complicated model of changing focus to the correct control and then pressing F1. In fact, if you re satisfied with simple pop-ups, you can achieve a more satisfying result by implementing it yourself. Just handle the Control.HelpRequested event to respond to the F1 key. The only limitation is that you re stuck hard-coding Help strings unless you store the strings in resources and write your own localization code.

As we stated earlier, different database servers implement transaction processing logic in different ways. Regardless of the implementation of the transaction processing system, however, a database server must conform to a set of rules, called the ACID test for transaction compliancy, in order to be considered a fully transaction-safe system.

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