Databases
Node.js Sequelize
Using Sequelize
Node.js Sequelize supports MySQL and PostgreSQL with typed models.
Introduction to Sequelize
Sequelize is a promise-based Node.js ORM (Object-Relational Mapping) for MySQL, PostgreSQL, MariaDB, SQLite, and Microsoft SQL Server. It provides support for managing databases and simplifies interaction with them through a robust set of features, including typed models. In this guide, we will explore how Sequelize works with MySQL and PostgreSQL.
Setting Up Sequelize
To get started with Sequelize, you need to install it along with the database driver of your choice. Here, we demonstrate the setup for both MySQL and PostgreSQL databases.
- For MySQL, you will need the
mysql2package. - For PostgreSQL, you will need the
pgandpg-hstorepackages.
Connecting to a Database
After installing the necessary packages, you can establish a connection to your database. Here is how you can set up a connection for both MySQL and PostgreSQL using Sequelize.
Defining Models
Sequelize allows you to define models that represent tables in your database. Models are defined using the sequelize.define method, which maps properties to table columns.
Syncing Models with the Database
Once you've defined your models, you can sync them with the database using the sequelize.sync() method. This will create the necessary tables in the database if they don't already exist.
CRUD Operations with Sequelize
Sequelize simplifies CRUD (Create, Read, Update, Delete) operations. Here are examples of how to perform these operations using a User model.
Conclusion
In this guide, we have covered the basics of using Sequelize with MySQL and PostgreSQL. From installing the necessary packages to defining models and performing CRUD operations, Sequelize provides a powerful API to manage your database effectively. Explore further to harness the full potential of Sequelize in your Node.js applications.
