14 Nov 2023
Repositories: A repository is a design pattern used to abstract the persistence and retrieval of domain objects, ensuring separation between the domain logic and the data storage. Repositories provide interfaces for storing, retrieving, and querying entities and aggregates within a domain.
Repositorys serve as a bridge between the application layer (where business logic resides) and the persistence layer (where data is stored).They typically offer abstraction methods for basic CRUD operations (create, read, update, delete) on domain objects. Moreover, they facilitate querying and provide methods for searching, filtering, and managing the storage and retrieval of these entities from a database or any underlying data source.
Repositories typically provide the following operations:
- Add: Adds a new aggregate root to the repository.
- Get: Retrieves an aggregate root by its identifier.
- Update: Updates an existing aggregate root in the repository.
- Remove: Removes an aggregate root from the repository.
Repositories can also provide more complex operations, such as querying for aggregates that meet certain criteria, or paginating through a large number of aggregates. Repositories are typically implemented in the infrastructure layer of a DDD application.
Here are some real-world examples of repositories in DDD:
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E-commerce:
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ProductRepository: This repository would be responsible for storing and retrieving product data, such as product name, description, price, and inventory levels.
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OrderRepository: This repository would be responsible for storing and retrieving order data, such as customer information, shipping information, and order items.
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Healthcare:
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PatientRepository: This repository would be responsible for storing and retrieving patient data, such as patient name, address, date of birth, and medical history.
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AppointmentRepository: This repository would be responsible for storing and retrieving appointment data, such as appointment date, time, and location.
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