DAL 简介
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The Data Access Layer (DAL) is an object-oriented service foraccessing and updating data in distributed databases and other persistent dataresources.
Applications, SOA, etc.... -------------> DAL ----------------> DB, etc
All create, read, update, and delete (CRUD) operations on persistentdata resources are performed through DAL's abstraction of the data.
The Data Access Layer:
· Decouplesthe persistence layer from the application layer
· Performs object/relationalmapping (ORM) — mapping data between the persistence layer's native form(e.g. a relational database schema) and Java objects
· Encapsulatesmechanisms for locating distributed data
· Encapsulatesfailover mechanisms
· Encapsulatescaching mechanisms
DAL provides a consistent, transparent, objectoriented API for accessing and updating data in distributed persistent dataresources.
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