Want know about CachedRowSet ?

hi everybody,
I wnat to know about CachedRowSet and exaple related to it.
and also want to know why do we use the DTO,DAO and VO in project.
Can anyone tell me about it, where i could get the details about these.

I wnat to know about CachedRowSet and exaple related to it.Simply read it's API documentation ... http://java.sun.com/j2se/1.5.0/docs/api/javax/sql/rowset/CachedRowSet.html
and also want to know why do we use the DTO,DAO and VO in project.Separation of the Data, Business and Presentation tiers.

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