Ensuring the integrity of the data is a fundamental responsibility of each developer. Fortunately, SQL databases give us the tools to ensure our database stays consistent and accurate. A crucial scenario to consider is when two SQL queries depend on each other. A typical example is transferring money between two bank accounts. Suppose we have […]
When working with SQL databases, we can configure constraints to ensure our data does not get corrupted. In this article, we explore and implement different SQL constraints using PostgreSQL, NestJS, and the Drizzle ORM. Not-null constraint By default, SQL columns can hold nulls, representing an absence of value. We need the not-null constraint using the […]
Managing relationships between tables is a significant part of dealing with SQL databases. In this article, we continue learning to use Drizzle ORM with NestJS and implement many-to-one relationships. Check out this repository if you want to see the full code from this article. The many-to-one relationship With many-to-one relationships, a row from the first […]
When building a database, the tables we set up often connect to each other. Managing these relationships is one of the crucial parts of working with databases. In the previous article, we learned how to use NestJS with Drizzle to set up a simple project with PostgreSQL. This time, we go further and write more […]
Drizzle is a lightweight TypeScript ORM that lets us manage our database schema. Interestingly, it allows us to manage our data through a relational API or an SQL query builder. In this article, we learn how to set up NestJS with Drizzle to implement create, read, update, and delete operations. We also learn how to […]
When a NestJS application starts, it creates instances of various classes, such as controllers and services. By default, NestJS treats those classes as singletons, where a particular class has only one instance. NestJS then shares the single instance of each provider across the entire application’s lifetime, creating a singleton provider scope. If you want to […]
Managing money is a part of developing web applications that we can’t cut corners on. This article explores various data types built into PostgreSQL and Prisma that we could use to handle finances. We also discuss which ones to avoid and why. Why we should avoid floating point numbers We are used to using fractions […]
Often, we might have a situation where a single entity, such as a comment, needs to be associated with more than one type of table. For example, the user might be able to comment on articles, photos, and more. One solution would be to create a separate table for each type of comment, such as […]
Ensuring that our application is secure is one of the most important things we must do as developers. One of the ways to protect our application from well-known vulnerabilities is to set appropriate response headers. There are quite a lot of different security-related response headers to consider. Fortunately, the helmet library can set them for […]
Command Line Applications are very useful for developers. We can interact with them by executing specific commands in the terminal, giving us much control and flexibility. You probably already interact with various CLI applications, such as Git or NPM. Interestingly, we can also use NestJS to create a Command Line Interface (CLI) application. In this […]
