Java data Access Object pattern

Data Access object patterns or DAO patterns are used to decouple low-level data access APIs or operations from advanced business services. The following are participants in the data Access object pattern.

• data Access Object Interface -this interface defines the standard operations to be performed on model objects.

• data Access Object Concrete class -This class implements the above interface. This class is responsible for getting data from a data source, which can be a database/xml or any other storage mechanism.

• model object or Value object -This object is a simple pojo that contains methods for storing data retrieved using the DAO class get/set .

Implementing an instance

In this will create an object as a Model or Value object Student . StudentDaois the data Access object interface. StudentDaoImplis the concrete class that implements the interface of the data Access object. Daopatterndemo This is a demo class that will use the StudentDao presentation using the data Access object pattern.

The structure of the data Access object pattern sample is as shown in-

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Java data Access Object pattern