October 2017
Intermediate to advanced
396 pages
10h 2m
English
Content preview from Spring 5 Design Patterns
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The data access object pattern
The data access object (DAO) pattern is a very popular design pattern for the persistent layer in a J2EE application. It separates the business logic layer and persistence layer. The DAO pattern is based on the encapsulation and abstraction object-oriented principles. The context for using the DAO pattern is to access and persist data depending on the underlying vendor implementation and type of storage, such as object-oriented database, flat files, relational databases, and so on. Using the DAO pattern, you can create a DAO interface, and implement this DAO interface to abstract and encapsulate all access to the data source. This DAO implementation manages the database's resources like connections with the ...
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