Much of ADO’s power and flexibility is due to the fact that you can use it to connect to a varierty of different data providers and still expose the same programming model, regardless of the specific features of any given provider.
However, because each provider is unique, how your application interacts with ADO will vary slightly between different providers. The differences you need to be aware of fall into several different categories:
Provider-specific details in each of these three areas are listed for each of the current Microsoft providers - for ODBC, for the Microsoft Jet Database Engine, and for the Microsoft Index Server - in Microsoft ODBC Provider for OLE DB, Microsoft Jet Database Engine Provider for OLE DB, and Microsoft Index Server Provider for OLE DB, respectively.
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