Sunday, May 13, 2007

DAO study notes

Data Access Objects can be used in Java to insulate an application from the underlying Java persistence technology, which could be JDBC, JDO, EJB CMP, TopLink, Hibernate, iBATIS. Using Data Access Objects means the underlying technology can be upgraded or swapped without changing other parts of the application.

--http://www.oracle.com/technology/sample_code/tech/java/j2ee/designpattern/dataaccesstier/dao/readme.html
j4: The DAO completely hides the data source implementation details
from its clients.
j4: Because the interface exposed by the DAO to clients does not
change when the underlying data source implementation changes, this
pattern allows the DAO to adapt to different storage schemes without
affecting its clients
--http://java.sun.com/blueprints/patterns/ViewHelper.html
if (dao == null) dao = CatalogDAOFactory.getDAO();
return dao.getProducts(categoryId,...)
--http://daoexamples.sourceforge.net/index.html
comprehensive but simple sample code



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