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My.Application.Log.WriteException(theError)
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Of course, if an error occurs while writing to the log, that would be a big problem, so add one more line to the start of the GeneralError routine.
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On Error Resume Next
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As I mentioned earlier, it s a good idea to include a global error handler in your code, in case some error gets past your defenses. To include this code, display all files in the Solution Explorer using the Show All Files button, open the ApplicationEvents.vb file, and add the following code to the MyApplication class.
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Private Sub MyApplication_UnhandledException( _ ByVal sender As Object, ByVal e As Microsoft. _ VisualBasic.ApplicationServices. _ UnhandledExceptionEventArgs) Handles _ Me.UnhandledException ' ----- Record the error, and keep running. e.ExitApplication = False GeneralError("Unhandled Exception", e.Exception) End Sub
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Since we already have the global GeneralError routine to log our errors, we might as well take advantage of it here. That s it for functional and error-free programming. In the next chapter, which covers database interactions, we ll make frequent use of this error-handling code.
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9: Functional Programming
10
ADO.NET
If you have ever read any programming books related to Microsoft development technologies, you have already read a chapter just like this one. It seems that every Windows programming book has an obligatory chapter on database interaction. The reason for this widespread coverage comes as no surprise: Microsoft comes out with a new database technology every two years or so. If you are new to Windows development, you haven t yet been briefed on the following sometimes conflicting, sometimes complementary database interaction tools: ODBC Open DataBase Connectivity ISAM Indexed Sequential Access Method DAO Data Access Objects RDO Remote Data Objects OLE DB Object Linking and Embedding for Databases ADO ActiveX Data Objects When you look at this list, you might think, Wow, that s great. There are so many options to choose from. You would be foolish to think this. This list isn t great; it s terrible. Imagine, just for a moment, that we weren t talking about database interfaces, but about other, more practical issues. What if you had to replace the engine in your car every two years What if the steering column had to be replaced annually What if you had to replace the oil every 3,500 miles or three months, whichever came first Could you imagine life in such a world Whenever Microsoft introduced a new database object technology into the mix, it was quickly followed by a flurry of reprogramming to bring older legacy Visual Basic (and other) applications up to the latest database technology. This wasn t always possible, as time and budget constraints kept organizations on older platforms. For nearly a decade I maintained a quarter-million-line application using DAO, only recently updating it to .NET technologies. Although ADO, a more powerful and flexible technology than DAO, was available for many years during that interim, the cost at the time to move from DAO to ADO was prohibitive.
So far, it seems that ADO.NET, Microsoft s database library for .NET, is different. It s been out for about seven years (as of this writing), and Microsoft hasn t yet teased programmers with a replacement. ADO.NET is quite flexible, and that flexibility will hopefully allow it to stretch itself over new advances in technology for the foreseeable future. If you are familiar with the ADO technology, prepare to forget it. ADO.NET is not the natural successor to ADO. It s a completely new technology that is unrelated to ADO, and although it shares some terminology with ADO and other older tools, ADO.NET does this only to play with your mind.
What Is ADO.NET
ADO.NET is a set of classes, included with the .NET Framework, that represent the primary method by which .NET applications interact with relational databases and other open and proprietary data management systems. But it s not just for interaction; ADO.NET is, in reality, a partial in-memory relational database all by itself. You can create tables and relationships (joins) with ADO.NET objects, add and remove records, query tables based on selection criteria, and do other simple tasks that are typical of standalone relational database systems. All classes included with ADO.NET appear in the System.Data namespace; other subordinate namespaces provide derived classes geared toward specific database platforms. For instance, the System.Data.SqlClient namespace targets SQL Server databases, and System.Data.OracleClient focuses on Oracle RDBMS systems. Other database providers can develop streamlined implementations of the various ADO.NET classes for use with their own systems, and supply them as a separate namespace. ADO.NET implements a disconnected data experience. In traditional database programming, especially in desktop applications, the connection between an application and its database was fixed and long-term. When the program started up, the connection started up. When the program exited many hours later, the connection finally ended. But in a world of massively scalable web sites, keeping a database connected for hours on end is sometimes wasteful and often impossible. ADO.NET encourages you to open data connections just long enough to get the data that fulfills your immediate needs. Once you have the data, you drop the connection until the next time you need to retrieve, insert, or update database content. If you issue the following SQL statement:
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