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Vendors have produced many solutions to this goal, the two most notable early solutions being Microsoft's Open Database Connectivity (ODBC) and Borland's Integrated Database Application Programming Interface (IDAPI), more commonly known as the Borland Database Engine (BDE).

Microsoft started to replace ODBC with OLE DB in the mid-1990s with the success of the Component Object Model (COM).

The idea is to use a single API that applications can use to interact with many different sources of data.

The use of such an API would release developers from dependence on a single database engine and allow them to adapt to the world's changing demands.

It is impossible to reliably list all available OLE DB providers, because the list is so large and changes constantly.

In addition to independent third parties, you should consider most database vendors, because the majority now supply their own OLE DB providers.

You should treat it as your first port of call when you need MDAC information.

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Active X Data Objects (ADO) is a layer on top of OLE DB and is referred to as an interface.

They are ADO's equivalent to the db Express drivers and the BDE SQL Links.

When you install MDAC, you automatically install the OLE DB providers shown in Table 15.1: MDAC includes many providers that I'll discuss, but many more are available from Microsoft and from the third-party market.

First, it is highly likely that your users will already have MDAC installed on their machines.

Second, whatever version your users have, or you upgrade them to, it is also virtually certain that someone—you, your users, or other application software—will upgrade their existing MDAC to the current release of MDAC.