By William R. Vaughn
ADO.NET and ADO Examples and most sensible Practices for VB Programmers, moment Edition brings the preferred first version modern with clean insights and tips about COM-based ADOand provides a voluminous part at the new ADO.NET expertise. Written in particular for COM-based ADO builders retooling for ADO.NET, it is a developer's e-book, jam-packed with functional suggestion on the best way to make code run quicker, but be more uncomplicated to write down and understand.
Veteran writer William Vaughn publications you thru the information entry maze with working examples and diverse discussions of what works and what does not. Derived from years of expertise operating with information entry builders, Vaughn's Best Practices are a suite of suggestions confirmed to tremendously decrease overhead, difficulties, and confusion—for the developer, the approach, and the complete crew. whereas a few are very simple to enforce, others require huge wisdom and forethought to enable.
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Additional resources for ADO.NET and ADO Examples and Best Practices for VB Programmers
ADO and OLE DB When I start talking about getting at data from ADO, you might want to know a little more about what's going on behind the scenes. Well, as you know (or should know) ADO is a Component Object Model (COM) interface to OLE DB providers, and OLE DB expects to be accessed by consumers such as ADO. So, formally, an OLE DB Consumer is any piece of system or application code that consumes an OLE DB interface. This includes OLE DB components themselves. Figure 2-1 illustrates how ADO interfaces with OLE DB.
If you're working in one of these more conservative companies, keep reading. Many of you will be using ADO from Visual Basic Script running on liS or the local browser (less likely). In this case, you won't be using the Visual Basic IDE to create your applications, which means that you have to code the ADO object instantiations yourself as in: Dim en ' This will be our ADO connection object. Connection") If you use Visual InterDev (VI) to develop your ASP or HTM pages, VI will try to help you populate objects it recognizes using statement completion-but it's not nearly as comprehensive and complete as the support in the Visual Basic IDE.
This is the database that the connection will use when executing queries. If you don't set an initial catalog, you'll be connected to whichever database the SA assigned as the default database. Let's not go there again. While you can set a DefaultDatabase in either the ConnectionString or via the DefaultDatabase property, your login/role might not have permission to use this database. Again, these permissions are established and managed by the SA. 33 Chapter4 • Manage transactions on the connection, including nested transactions if the provider supports them, with the IsolationLevel, BeginTrans, Commit'fums, and RollbackTrans methods, and with the Attributes property.
ADO.NET and ADO Examples and Best Practices for VB Programmers by William R. Vaughn