Object‑Relational Mapping (ORM) bridges the gap between your code and your database. This unit covers the Active Record and Data Mapper patterns, defining relationships, the N+1 problem, migrations, and transactions — using modern tools like Prisma and TypeORM.

Unit Learning Outcomes

• Implement CRUD operations using an ORM (Prisma/TypeORM).
• Define and query relationships (1:1, 1:N, M:N).
• Solve the N+1 query problem using eager loading.
• Create and run database migrations.
• Write transactional operations with rollback support.

Tutorials

Assessments & Deliverables