What are the key features of TypeORM?

What are the key features of TypeORM?

TypeORM is an ORM for TypeScript and JavaScript that supports various databases. Key features include: 1. Active Record and Data Mapper patterns, 2. Support for multiple database systems, 3. Migrations for version control, 4. Eager and lazy loading, 5. Query builder for complex queries.

Can you explain the difference between Active Record and Data Mapper?

Sure! Active Record is a pattern where the object itself contains the logic to save and retrieve data, while Data Mapper separates the in-memory objects from the database, allowing for more flexibility and testability.

What databases does TypeORM support?

TypeORM supports various databases including MySQL, PostgreSQL, SQLite, Microsoft SQL Server, and Oracle, among others.

How do migrations work in TypeORM?

Migrations in TypeORM allow you to define changes to your database schema in a version-controlled manner. You can create, run, and revert migrations using the TypeORM CLI.