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What is DAO?  RSS feed

 
Gurumurthy Ramamurthy
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Hi,
I have gone through this forum about the diff. bet. DAO and Entity Beans. Is it something like a framework so that it gives us the API/methods for doing all kinds of data access?
Then, another qn. came to my mind is that what is the diff. bet. JDBC and DAO?
Your answers pls...
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Pradeep bhatt
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http://java.sun.com/blueprints/patterns/DAO.html

JDBC is a API provided by SUN to access relational database. DAO is defined by the developer. Suppose I want to access Employee info which may be stored in some flat files,RELATIONAL database or some OODMS. I define an interface with methods that will allow me retrieve, update or delete functionlities. My business logic will talk to the interface only.
I could then implement the interface for say, Oracle Database and have SQL code inside the implemented methods.
In case I need to access employee info stored in some other datastore I will be creating another implementation class without touching the business logic.
[ August 14, 2003: Message edited by: Pradeep Bhat ]
 
It is sorta covered in the JavaRanch Style Guide.
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