Core J2EE Tasarım desenleri 1 : DAO Data Access Object

Data Access Object

Problem:

Veriye erişilmesi ve değiştirilmesini encapsulate etmek istiyoruz.

İstekler:

• 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.

Çözüm:

Use a Data Access Object to abstract and encapsulate all access to the persistent store. The Data Access Object manages the connection with the data source to obtain and store data.