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ORM
Table of contents
What is ORM?
Object Relational Mapping is technique that lets you query and manipulate data from a database, using an object oriented paradigm.
Pros of ORM
- writing the data model in one place - easier to maintain.
- lots of things done automatically
- no need to write SQL syntax
- database abstraction - you can change the database type whenever you wish.
- leverages OOP therefore things like inheritance are easy to achieve.
Cons of ORM
- you have to learn it, and ORM libraries are not always simple
- performance is alright, but it's easy to neglect
- makes it easy to forget (or never learn)
Install TypeORM
Terminal
npm i @nestjs/typeorm typeorm pg
