Oledb -

Today, OLE DB survives primarily in:

The proliferation of data sources in the client-server era of the mid-1990s presented a formidable challenge: each data store (relational database, email server, file system, directory service) exposed a proprietary API. Open Database Connectivity (ODBC) solved part of the problem by standardizing SQL-based relational access but explicitly excluded non-relational, non-SQL, or hierarchical data sources. Today, OLE DB survives primarily in: The proliferation

OLE DB, Universal Data Access, COM, Rowset, Data Provider, Query Processing, Legacy Systems. Direct OLE DB C++ consumers (e

Direct OLE DB C++ consumers (e.g., ATL OLE DB Consumer templates) achieved near-native performance. However, going through ADO added a thin but measurable layer. By contrast, ODBC remained faster for purely relational, bulk operations because of its simpler calling convention and lack of COM reference counting per column access. OLE DB is built entirely on COM, requiring

OLE DB is built entirely on COM, requiring interface querying ( QueryInterface ), reference counting ( AddRef / Release ), and apartment threading models (STA/MTA). This design choice enabled language independence but introduced steep learning curves for C++ developers and made direct use from languages like Java or VB impractical without wrappers.