3.1. Data Access Object

Data Access Object enables loose coupling between the business and resource tiers. Data Access Object encapsulates all the data access logic to create, retrieve, delete, and update data from a persistent store. Data Access Object uses Transfer Object to send and receive data. The Data Access Object pattern encapsulates access to a persistent store by managing the connection with the data store. 

UML representation


Benefits

The following lists the benefits of using the Data Access Object pattern:
  • Reduces code complexity in client
  • Improves code reuse
  • Provides easier migration to new data store

When to Use

You should use the Data Access Object pattern to:
  • Decouple data access from the business logic
  • Provide all data access from in a separate layer
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