This pattern belongs to Object-Relational Metadata Mapping Patterns Catalog and this Catalog belongs to Patterns of Enterprise Application Architecture . Intent Repository layer is added between the domain and data mapping layers to isolate domain objects from details of the database access code and to minimize scattering and duplication of query code. The Repository pattern is especially useful in systems where a number of domain classes are large or heavy querying is utilized. Real World Examples Spring Data Applicability Use the Repository pattern when the number of domain objects is large you want to avoid duplication of query code you want to keep the database querying code in a single place you have multiple data sources Explanation A system with a complex domain model often benefits from a layer, such as the one provided by Data Mapper , that isolates domain objects from details of the database access code. In such systems, it can be worthwh...
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