Naturally, developers still have the choice of writing applications which directly access OLE DB and ODBC. Developers of Windows applications are encouraged to use ADO or ADO.NET for data access, the benefit being that users of the application program are not constrained in their choice of database architecture except that it should be supported by MDAC. The Microsoft SQL Server Network Library, a proprietary access method specific to Microsoft SQL Server, is also included in the MDAC.
These component layers are all made available to 1Ģ. NET managed providers and ODBC drivers), and the database itself. MDAC architecture may be viewed as three layers: a programming interface layer, consisting of ADO and ADO.NET, a database access layer developed by database vendors such as Oracle and Microsoft (OLE DB. Architecture The latest version of MDAC (2.8) consists of several interacting components, all of which are Windows specific except for ODBC (which is available on several platforms). The current version is 2.8 service pack 1, but the product has had many different versions and many of its components have been deprecated and replaced by newer Microsoft technologies. Throughout its history MDAC has been the subject of several security flaws, which lead to attacks such as an escalated privileges attack, although the vulnerabilities were generally fixed in later versions and fairly promptly. Eventually, later versions were integrated with Microsoft Windows and in MDAC 2.8 SP1 they ceased offering MDAC as a redistributable package. The first version of MDAC was released in August 1996, and according to statements from Microsoft was more of a concept than a stand-alone program and had no widespread distribution method, though later Microsoft released upgrades to MDAC as web-based redistributable packages. Some components have also become obsolete, such as the former Data Access Objects API and Remote Data Objects. There have been several deprecated components as well, such as the Microsoft Jet Database Engine, MSDASQL, and Remote Data Services (RDS). It is made up of various components: ActiveX Data Objects (ADO), OLE DB, and Open Database Connectivity (ODBC).
Microsoft Data Access Components Introduction Microsoft Data Access Components, commonly abbreviated MDAC is a group of Microsoft technologies that interact together as a framework that allows programmers a uniform and comprehensive way of developing applications for accessing almost any data store.
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