28 lines
777 B
Markdown
28 lines
777 B
Markdown
---
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layout: pattern
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title: Data Access Object
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folder: dao
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permalink: /patterns/dao/
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pumlid: 5SR14OKW30N0LhG0oVrt4o6ZE12Ov4NR_thQNQlc5aN2sd82qtz4naywAixOmyNoK8WYvT6fjdWOR7JnpLiHhuTkam4nTUhiRwZm847-J64zpUZj3m00
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categories: Persistence Tier
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tags:
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- Java
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- Difficulty-Beginner
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---
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## Intent
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Object provides an abstract interface to some type of database or
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other persistence mechanism.
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## Applicability
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Use the Data Access Object in any of the following situations
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* when you want to consolidate how the data layer is accessed
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* when you want to avoid writing multiple data retrieval/persistence layers
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## Credits
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* [J2EE Design Patterns](http://www.amazon.com/J2EE-Design-Patterns-William-Crawford/dp/0596004273/ref=sr_1_2)
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