ORM and NestJS
Explore how ORM bridges your application objects and relational databases in NestJS. Learn to define entities, map properties, and manage database operations using TypeORM with MySQL. Understand benefits, limitations, and criteria for choosing the right ORM to build maintainable and secure RESTful APIs efficiently.
We'll cover the following...
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
Userclass 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. ...