layout	pattern
title	Data Access Object
folder	dao
permalink	/patterns/dao/
categories	Persistence Tier
tags	Java Difficulty-Beginner

Intent

Object provides an abstract interface to some type of database or other persistence mechanism.

Applicability

Use the Data Access Object in any of the following situations

• when you want to consolidate how the data layer is accessed
• when you want to avoid writing multiple data retrieval/persistence layers

Credits

• J2EE Design Patterns