layout	pattern
title	Data Access Object
folder	dao
permalink	/patterns/dao/
pumlid	5SR14OKW30N0LhG0oVrt4o6ZE12Ov4NR_thQNQlc5aN2sd82qtz4naywAixOmyNoK8WYvT6fjdWOR7JnpLiHhuTkam4nTUhiRwZm847-J64zpUZj3m00
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