Editing Data access object (section)

== Advantages ==

Using data access objects (DAOs) offers a clear advantage: it separates two parts of an application that don't need to know about each other. This separation allows them to evolve independently. If business logic changes, it can rely on a consistent DAO interface. Meanwhile, modifications to persistence logic won't affect DAO clients.<ref>{{Cite web |date=2022-08-03 |title=Data Access Object(DAO) Design Pattern |url=https://www.digitalocean.com/community/tutorials/dao-design-pattern |access-date=2024-07-08 |website=DigitalOcean |language=en-US}}</ref><ref>{{Cite web |date=2017-08-26 |title=Data Access Object(DAO) Design Pattern |url=https://www.geeksforgeeks.org/data-access-object-pattern/#8-advantages-of-the-data-access-object-designdao-pattern |access-date=2024-07-08 |website=GeeksforGeeks |language=en-US}}</ref>

All details of storage are hidden from the rest of the application (see [[information hiding]]). [[Unit testing]] code is facilitated by substituting a [[test double]] for the DAO in the test, thereby making the tests independent of the persistence layer.

In the context of the [[Java (programming language)|Java]] programming language, DAO can be implemented in various ways. This can range from a fairly simple interface that separates data access from the application logic, to frameworks and commercial products.

Technologies like [[Java Persistence API]] and [[Enterprise JavaBeans]] come built into application servers and can be used in applications that use a Java EE application server. Commercial products such as [[TopLink]] are available based on [[object–relational mapping]] (ORM). Popular open source ORM software includes [[Doctrine (PHP)|Doctrine]], [[Hibernate (Java)|Hibernate]], [[iBATIS]] and JPA implementations such as [[Apache OpenJPA]].<ref>{{Cite web |date=2017-08-26 |title=Data Access Object(DAO) Design Pattern |url=https://www.geeksforgeeks.org/data-access-object-pattern/ |access-date=2024-01-29 |website=GeeksforGeeks |language=en-US}}</ref>