ORM

ORM stands for object-relational mapping. It’s a technique to interact with relational databases using objects and classes rather than writing raw SQL queries.

In this lesson, we’ll explore ORM’s fundamentals and benefits, including how it simplifies database interactions and enhances application maintainability. We’ll also learn how NestJS seamlessly integrates with ORM, allowing us to work with databases in a structured and efficient manner.

How it works

ORM creates a bridge between the objects in our code and the tables in the database. It maps objects and classes to database tables through “object-relational mapping.”

Here’s a simplified explanation of how this mapping works:

Entities: We define entities as classes. Each class represents a specific data model, like User.
Properties and decorators: We define properties corresponding to a database table’s columns within the entity classes. For example, a User class might have properties like name, email, and password. We use decorators to specify the mapping between the properties and the database table columns. These annotations indicate which property is associated with which column in the table. ...

Introduction

NestJS Fundamentals

Connecting with REST: Building the Address Book App with NestJS

Understand the Basics of NestJS and RESTful APIs

Validation, Exception Handling, and Logging

Persist Data with TypeORM and MySQL

Serialization and Interceptors

Authentication and Authorization

Persist Data, Authentication, Validation, and Serialization

Testing

Deployment

Testing and Deployment

Conclusion

Appendix

ORM and NestJS

ORM

How it works