Cutting Edge: Writing Custom OLE DB Providers Using ATL

摘要

OLE DB is the technology that converts the Universal Data Access (UDA) philosophy into concrete programming calls. The idea behind it is surprisingly simple. The data source is wrapped by a module that exposes a standard set of COM interfaces. The interaction between a client module (called an OLE DB consumer) and the data source holder (called an OLE DB provider) always takes place through COM. Therefore, as you might guess, OLE DB consumers and providers are really COM objects. To work with them, all you need are some robust COM skills. Refer to Don Box's House of COM column in the July 1999 issue of MSJ for insightful observations about the way OLE DB was first conceived and implemented.