Software Design

Repository Pattern: Isolating Data Access

UML Class Diagrams · made in Skemio

UML class diagram of a UserService depending on a UserRepository interface, with PostgresUserRepository implementing the data access contract.
UML class diagram of a UserService depending on a UserRepository interface, with PostgresUserRepository implementing the data access contract.
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What it shows

  • Shields domain services from database drivers, ORMs, and raw SQL queries.
  • Enables instant unit testing using in-memory mock repositories.
  • Provides a centralized place to optimize query caching and transactions.

The takeaway

Mediate between domain entities and data mapping so business logic never depends on storage.

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