layout	title	folder	permalink	categories	tags
pattern	Data Access Object	dao	/patterns/dao/	Persistence Tier	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