TOPIC OVERVIEW

NestJS/Database and ORM

Connect NestJS to databases while keeping data access organized and separate from your business logic.

18 QuestionsAdvancedHigh Priority ~13 min read

Most NestJS applications need to store and retrieve data from a database. NestJS can work with different database libraries and ORMs, allowing your application to define entities or schemas, perform queries, and manage relationships.

A clean data-access layer keeps database-specific logic away from controllers and other business logic. You also need to understand transactions, relationships, migrations, connection management, and query performance when building production applications.

What you'll walk away knowing

How NestJS connects to relational and NoSQL databases

How repositories, entities, and schemas organize data access

How transactions and relationships are handled

How to avoid common database performance problems

1How do you implement optimistic locking with TypeORM to prevent lost updates in NestJS?Intermediate 2How do you propagate a TypeORM transaction across multiple services in NestJS?Intermediate 3What is the difference between find(), findOne(), findOneOrFail(), and the Query Builder in TypeORM?Intermediate 4How do you integrate Prisma into a NestJS application?Intermediate 5How do you handle database connection pooling and health checks in NestJS?Intermediate 6How do you implement a custom TypeORM repository in NestJS?Intermediate 7What is the repository pattern and why use it in NestJS?Intermediate 8How do you add schema middleware (hooks) and instance methods in NestJS Mongoose?Intermediate 9How do you seed a database in a NestJS application?Intermediate 10How do you implement multi-tenancy with a shared database in NestJS TypeORM?Intermediate 11How do you implement a Unit of Work pattern to group database operations across repositories in NestJS?Intermediate 12How do you use Prisma with multiple databases in a single NestJS application?Intermediate 13How do you perform CRUD operations and add query methods to a Mongoose model in NestJS?Intermediate 14What are Prisma middleware and how do you use them for audit logging in NestJS?Intermediate 15How do you set up Mongoose in a NestJS application and define a schema?Intermediate 16How do you implement soft deletes in NestJS with TypeORM?Intermediate 17What are the two main ways to run a database transaction in TypeORM with NestJS?Intermediate 18How do you set up TypeORM in a NestJS application?Intermediate 19How do you handle Prisma migrations in a CI/CD pipeline?Intermediate 20How do you handle Mongoose transactions for multi-document atomic operations in NestJS?Intermediate 21How do you mock a repository in a NestJS unit test?Intermediate 22How do you define a TypeORM entity and register it in a NestJS feature module?Intermediate 23How do you implement database read replicas in NestJS for read/write splitting with TypeORM?Intermediate 24How do you handle TypeORM migrations in a NestJS project?Intermediate 25How do you run a transaction with Prisma in NestJS?Intermediate

All Topics

1

Dependency Injection

2

Request Lifecycle

Exception Handling

3

4

Database and ORM

5

Authentication and Authorization

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