Book Image

Supercharging Node.js Applications with Sequelize

By : Daniel Durante
4 (1)
Book Image

Supercharging Node.js Applications with Sequelize

4 (1)
By: Daniel Durante

Overview of this book

Continuous changes in business requirements can make it difficult for programmers to organize business logic into database models, which turns out to be an expensive operation as changes to the database may result in errors and incongruity within applications. Supercharging Node.js Applications with Sequelize helps you get to grips with Sequelize, a reliable ORM that enables you to alleviate these issues in your database and applications. With Sequelize, you'll no longer need to store information in flat files or memory. This book takes a hands-on approach to implementation and associated methodologies for your database that will have you up and running in no time. You'll learn how to configure Sequelize for your Node.js application properly, develop a better sense of understanding of how this ORM works, and find out how to manage your database from Node.js using Sequelize. Finally, you'll be able to use Sequelize as the database driver for building your application from scratch. By the end of this Node.js book, you'll be able to configure, build, store, retrieve, validate, and associate your data from a database to a Node.js application.
Table of Contents (16 chapters)
1
Part 1 – Installation, Configuration, and the Basics
4
Part 2 – Validating, Customizing, and Associating Your Data
10
Part 3 – Advanced Queries, Using Adapters, and Logging Queries

Running transactions concurrently

Depending on whether your application requires isolation between reads and writes, within the database, you may need to explicitly run multiple transactions at the same time. Sequelize offers two methods for running transactions concurrently: recursively chaining transactions (Sequelize’s native method) or integrating your application with a third-party module called CLS.

Note

SQLite does not support running multiple transactions concurrently.

Running transactions concurrently with Sequelize

We can run transactions concurrently with Sequelize concurrently by chaining two transaction methods together, which would look similar to this:

sequelize.transaction((tx1) => {
    return sequelize.transaction((tx2) => {

Now, we can run multiple queries simultaneously while using different transactions, as follows:

        return Promise.all([
    ...