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 Mapper) that supports popular SQL dialects such as MySQL, PostgreSQL, MariaDB, and SQLite. It provides a powerful solution for managing data and performing database operations using JavaScript, allowing developers to interact with databases through object-oriented programming.
Installing Sequelize
To get started with Sequelize, you need to install Sequelize and the database driver of your choice. For MySQL, you would use mysql2, and for PostgreSQL, you would use pg and pg-hstore.
Setting Up Sequelize
After installing Sequelize, you need to set up your Sequelize instance by configuring the connection to your database. Here is a basic example of setting up a connection to a MySQL database:
Defining Models
In Sequelize, models are defined using the sequelize.define method. Models represent tables in your database and allow you to perform CRUD operations. Here is an example of defining a simple model for a User table:
Synchronizing Models with Database
Once models are defined, you can synchronize them with your database. This process will create the necessary tables if they don't exist. The sync method is used to achieve this:
Performing CRUD Operations
Sequelize makes it easy to perform CRUD operations. Here's how you can create, read, update, and delete instances of the User model:
Conclusion
Sequelize offers a robust and flexible solution for managing SQL databases in Node.js applications. By abstracting database operations into easy-to-use models, Sequelize allows developers to write clean and maintainable code. Whether you're working with MySQL or PostgreSQL, Sequelize can help streamline your database interactions.
