71e3443e0e
Otherwise the picture cant be found, as the jekyll build process will put this file in a 'dm' directory and the other stuff like resources in a 'data-mapper' directory (because resources dont have permalink specified they are served static)
26 lines
713 B
Markdown
26 lines
713 B
Markdown
---
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layout: pattern
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title: Data Mapper
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folder: data-mapper
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permalink: /patterns/data-mapper/
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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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A layer of mappers that moves data between objects and a database while keeping them independent of each other and the mapper itself
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## Applicability
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Use the Data Mapper in any of the following situations
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* when you want to decouple data objects from DB access layer
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* when you want to write multiple data retrieval/persistence implementations
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## Credits
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* [Data Mapper](http://richard.jp.leguen.ca/tutoring/soen343-f2010/tutorials/implementing-data-mapper/)
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