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

Validating Models

It is important to maintain consistency and integrity within databases. Databases often use some form of constraint stipulation to ensure consistency. Typically, these constraints consist of checking for a range of values, such as minimum string length, uniqueness, or existence. Integrity for databases involves managing the associations and relations between symbiotic records. This involves cascading updates and deletions of referenced records (for example, setting the associated identity columns to NULL when the referenced record has been deleted). Consistency and integrity are not mutually exclusive to one another, but the two patterns help to ensure organization.

Note

The term consistency refers to ensuring that only valid data will be written and read from the database (especially within the context of accessing data concurrently). Integrity refers to data that conforms to a set of rules, constraints, or triggers before it is inserted or read.

While...