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What is the difference between a DAO and a repository?
DAO is an abstraction of data persistence. However, a repository is an abstraction of a collection of objects. DAO works as a data mapping/access layer, hiding ugly queries. However, a repository is a layer between domains and data access layers, hiding the complexity of collating data and preparing a domain object.
Is Spring repository a DAO?
Repository are nothing but well-designed DAO. ORM are table centric but not DAO.
Is Spring data JPA an ORM?
Q1 Is Spring Data JPA, ORM? If not then, what it is? No. It is a system to create “automatic” Data Access Objects (DAOs) for you at compile time, and uses an ORM (like Hibernate) in these DAOs.
What’s the difference between A Dal and a repository?
DAL is a general term for abstracting away Data Access concerns. Repository is a similar, but more specific, concept from DDD. Your DAL will likely be composed of several Repositories. The Data Access Layer is an architectural layer that intends to abstract access to data.
Which is a specific pattern belongs to the Dal?
The Repository is a specific pattern that belongs to the DAL (see list of patterns at the end of this link ). It says exactly how to abstract a specific access to data: by offering a collection like interface to the data store. Interestingly, in your example of class library, DAL.Product seems to be a repository.
When to use repository pattern in ADO.NET?
Repository pattern is an abstraction layer you put on your data access layer. Your data access layer can be anything from pure ADO.NET stored procedures to Entity Framework or an XML file. In large systems, where you have data coming from different sources (database/XML/web service), it is good to have an abstraction layer.
What’s the difference between a dao and a repository?
However, Repository is a higher-level concept, closer to the Domain objects DAO works as a data mapping/access layer, hiding ugly queries. However, a repository is a layer between domains and data access layers, hiding the complexity of collating data and preparing a domain object