In the above code, all the bold letters are inside the ‘executeTransaction’. dataSource.js import Sequelize from 'sequelize' const DbConnection = new Sequelize(config.database, er, config.password, It’s better, not to use ‘number of pools’ more than 5. So we need to change the default configurations of connection pool. Here we are using more than one process with the transactions. Sequelize will set up a connection pool on initialization. Here we are using MySQL.If you’re connecting to the database from a single process, you should create only one Sequelize instance. Now you need to set the configurations for database connection. But if you haven’t used the correct method for transactions, your system will still work fine for a single request, but it will not give the expected results when you make multiple requests in the same time and if you test your system with Load test, it will give very low performance and maybe unexpected ‘Log’ results.įrom this blog, we are going to understand how to handle transactions properly in asynchronous code using Sequelize ORM and MySQL.įirst You need to install Sequelize npm package using this command. When you are ready to use Sequelize just use npm to install the package in your dependencies.įrom this point, we are going to talk about how to use Sequelize Transactions in asynchronous code. Sequelize is easy to learn and has many different great features like transaction support, synchronization, association, validation and many more. Now let’s see why Sequelize is very famous among Node.js developers while we are having many other ORMs such as node-orm2, Bookshelf, Objection.js, and CaminteJS which we can use for Node.js and MySQL. You can find the Official page of Sequelize from Here. Sequelize is a promise-based Node.js ORM for Postgres, MySQL, MariaDB, SQLite, and Microsoft SQL Server.
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