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In software, a data access object (DAO) is a pattern that provides an abstract interface to some type of database or other persistence mechanism. By mapping application calls to the persistence layer, the DAO provides data operations without exposing database details.
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This kind of model could be implemented by creating a class of data access methods that directly reference a corresponding set of database stored procedures. Another implementation could potentially retrieve or write records to or from a file system. The DAL hides this complexity of the underlying data store from the external world.
DAO were originally called "VT Objects.: DAO 1.0 came up in November 1992 as part of Access 1.0. In version 3.5 it was able to bypass the Jet engine all together and directly access ODBC data sources, including Microsoft SQL Server and other enterprise database systems. DAO 3.6 shipped with Jet 4.0.
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DAO—Data Access Object; DAO—Data Access Objects; DAO—Disk-At-Once; DAP—Directory Access Protocol; DARPA—Defense Advanced Research Projects Agency; DAS—Direct Attached Storage; DAT—Digital Audio Tape; DB—Database; DSKT—Desktop; DBA—Database Administrator; DBCS—Double Byte Character Set; DBMS—Database Management System ...
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