Saving date and time in our database can be tricky, but it’s crucial to do it correctly. In this article, we address this problem using PostgreSQL and Kysely. We also explore time zones and how to handle them when designing our database. Dates in PostgreSQL We can determine how our database handles dates by examining […]
Creating tests is essential when trying to build a robust and dependable application. In this article, we clarify the concept of unit tests and demonstrate how to write them for our application that interacts with PostgreSQL and uses the Kysely library. Explaining unit tests A unit test ensures that a specific part of our code […]
In previous parts of this series, we’ve learned how to implement logging in our REST API. Logs play an important role in debugging and maintaining reliable services. However, they can pose security and privacy risks when misused. In this article, we will learn how to prevent sensitive information from being stored in our logs. Logging […]
When working on our REST APIs, we usually focus on implementing the four fundamental operations: creating, reading, updating, and deleting (CRUD). Deleting entities is a common feature in many web applications. The simplest way to do it is by permanently deleting rows from the database. In this article, we use Kysely to explore the idea […]
PostgreSQL is great for structured data and is known for its reliability in maintaining data organization and consistency. On the other hand, MongoDB stores data in flexible JSON-like documents, making it ideal for data with varying attributes and evolving requirements. Using SQL has a lot of advantages over MongoDB, but we might need some flexibility […]
PostgreSQL outshines various other SQL databases with its feature set. Unlike most SQL databases, PostgreSQL offers extensive support for array columns. Using them, we can store collections of values within a single column without creating separate tables. In this article, we explore the capabilities of arrays in PostgreSQL and implement examples using Kysely. Creating the […]
SQL indexes act like guides in our database and help us retrieve the data faster. The bigger our database is, the more emphasis we need to put on its performance. By using indexes, we can help our PostgreSQL database retrieve the data faster. In this article, we learn what indexes are and how to create […]
So far, when working with Kysely, we fetched all rows from our tables. However, this might not be the best solution when it comes to performance. A common approach is to query the data in parts and present the users with separate pages or infinite scrolling. We implement pagination in this article with NestJS, PostgreSQL, […]
When using SQL databases, we can set constraints to ensure our data remains accurate and reliable during insertions, updates, or deletions. In this article, we’ll explore different SQL constraints and demonstrate how to apply them using Kysely and NestJS to maintain data integrity. Check out this repository for the full code from this article. Not-null […]
The integrity of our data should be one of the primary concerns of web developers. Thankfully, SQL databases equip us with tools that we can use to ensure the consistency and accuracy of our data. You can see the complete code from this article in this repository. One of the critical situations to consider is […]
