Friday, March 13, 2009

What are the difference between DAO (Data Access Object ) and DAC

Question :What are the difference between DAO (Data Access Object ) and DAC
(Data Access Component)? (DesignPatterns)

Answer :The advantage of using data access objects is that any business object
(which contains application or operation specific details)
does not require direct knowledge of the final destination for the
information it manipulates. As a result, if it is
necessary to change where or how that data is stored that modification can
be made without needing to change the main application.
Data Access Objects can be used in Java to insulate an application from
the underlying Java persistence technology, which could
be JDBC, JDO, EJB, Hibernate, or any one of a range of technologies. Using
Data Access Objects means the underlying technology
can be upgraded or swapped without changing other parts of the
application.

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