Sequelize ORM in Nodejs
Introduction:
If you’re a Nodejs developer and you want to use an Object Relational Mapping (ORM) tool to connect your Nodejs applications to a database, then look no further than the Sequelize library. Sequelize is an ORM for Nodejs applications that provides access to MySQL, Postgres, and SQLite databases. It makes it easy to interact with databases from within Nodejs applications, allowing developers to create, read, update, and delete records from the database with just a few lines of code.
In this blog post, we’ll take a look at what Sequelize is and how it can be used to interact with MySQL databases from within Nodejs applications. We’ll also cover how to use Sequelize to perform CRUD operations on MySQL databases.
How to use Sequelize in node.js?
Sequelize is a Nodejs ORM designed specifically for working with the MySQL database system. It’s an easy-to-use library that makes it simple to connect to a MySQL database from a Nodejs application. It provides support for all of the major SQL commands, as well as support for transactions and stored procedures.
To use Sequelize with a MySQL database, you’ll first need to install the Sequelize library via NPM:
npm install --save sequelize
Once you’ve installed it, you’ll need to create a connection to the MySQL database. To do this, you’ll need to provide Sequelize with a few parameters, including the name of your database, the username, and the password. After you’ve done this, you can then start using Sequelize to interact with the MySQL database.
Sequelize MySQL CRUD Operations:
Once you’ve established a connection to the MySQL database, you can then begin performing CRUD operations with Sequelize. CRUD stands for Create, Read, Update, and Delete, and it describes the four basic operations used to interact with a database.
To create a record in the database, you can use the create() method. This method takes an object as an argument and creates a new record in the database. For example, if you wanted to create a new user in the database, you could do something like this:
User.create({name: 'John Smith',email: 'john@example.com',password: 'password'
});
To read from the database, you can use the findAll() method. This method takes an object as an argument and returns all records in the database that match the parameters provided. For example, if you wanted to find all users in the database with a certain email address, you could do something like this:
User.findAll({where: {email: 'john@example.com'}
});
To update a record in the database, you can use the update() method. This method takes two arguments: a query object and an object of new data to be updated. For example, if you wanted to update a user’s email address, you could do something like this:
User.update({
name: 'John Smith',},
{email: 'john@example.net'
});
Finally, to delete a record from the database, you can use the destroy() method. This method takes an object as an argument and deletes all records in the database that match the parameters provided. For example, if you wanted to delete a user from the database, you could do something like this:
User.destroy({where: {name: 'John Smith'}
});
Conclusion
Sequelize is a great tool for connecting Nodejs applications to a MySQL database. It makes it easy to perform CRUD operations on the database with just a few lines of code. If you’re looking for a convenient way to interact with MySQL from within a Nodejs application, then Sequelize is a great option.
Sequelize is an Object-Relational Mapping (ORM) tool written in JavaScript which allows developers to more easily interact with relational databases like MySQL, Postgres, and SQLite. It can be used with Node.js to define models, query data, and perform CRUD operations. Sequelize makes it easier to structure and organize database operations, allowing developers to focus more on the application’s logic and less on manually writing SQL queries.
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