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 particularly for COM-based ADO builders retooling for ADO.NET, it is a developer's publication, choked with sensible suggestion on find out how to make code run speedier, but be more straightforward to jot down and understand.
Veteran writer William Vaughn courses you thru the information entry maze with working examples and various discussions of what works and what does not. Derived from years of expertise operating with info entry builders, Vaughn's Best Practices are a suite of thoughts confirmed to enormously lessen overhead, difficulties, and confusion—for the developer, the procedure, and the whole staff. whereas a few are very simple to enforce, others require huge wisdom and forethought to enable.
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Extra resources for ADO.NET and ADO Examples and Best Practices for VB Programmers
But the trainer in me said to lay some solid foundations before digging right into the coding techniques. So, this chapter has a few theoretical sections that describe ADO and where it fits in the bigger scheme of things. If you want to skip down to the techie stuff, go ahead. I start talking about cool coding stuff in the Chapter 3. However, if you need a few more words on ADO, stick around. 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.
You made the SA mad yesterday when you accused him of playing with the connections count. 6. The server you're trying to connect to does not speak named pipes-only sockets. You forgot that the target server is MSDE. 7. The Data Source Name you specified in the ConnectionString does not exist. You forgot to install it on every single system in the universe where your application runs. You're afraid to tell the users they have to run another setup step. 8. You chose the wrong provider for the database.
However, with ADO there are far fewer object-based properties, a lot fewer objects, and only four collections. Both DAO and RDO were choked (literally) with collections that consumed memory, and more importantly, CPU resources. They were also a constant source of memory leak problems, flS objects were created and destroyed out of turn. The latest ADO object model has only five base objects-Connection, Command, Recordset, Record, and Stream. These can all be created independently. This means you don't have to create a Connection object or a Command object to create a Recordset-as a matter of fact, it often makes sense not to do so.
ADO.NET and ADO Examples and Best Practices for VB Programmers by William R. Vaughn