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From the book Forces

Forces

  • You want to implement data access mechanisms to access and manipulate data in a persistent storage.
  • You want to decouple the persistent storage implementation from the rest of your application.
  • You want to provide a uniform data access API for a persistent mechanism to various types of data sources, such as RDBMS, LDAP, OODB, XML repositories, flat files, and so on.
  • You want to organize data access logic and encapsulate proprietary features to facilitate maintainability and portability.
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