Removing entities is a very common feature in a lot of web applications. The most straightforward way of achieving it is permanently deleting rows from the database. In this article, we implement soft deletes that only mark records as deleted. You can find the code from this article in this repository. The idea behind soft […]
As our database grows, we need to put more and more emphasis on performance. A popular approach to dealing with this problem is by implementing indexes. In this article, we look into doing that with raw SQL in a project that does not use ORM. Introducing indexes So far, in this series, we’ve created a […]
It is very common to implement a feature of searching through the contents of the database. In one of the previous articles, we learned how to implement it in a simple way using pattern matching. Today we take it a step further and learn about the data types explicitly designed for full-text search. Text Search […]
In this series, we’ve often had to filter the records in our database. We can achieve that with a simple WHERE clause.
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SELECT * FROM posts WHERE author_id = 1 |
In this article, we go through different use cases of more advanced filtering. We achieve it by using the WHERE keyword with subqueries. EXISTS In some of the previous parts of this series, […]
Having significant control over the data we store in our database is crucial. One of the ways to do that is to choose suitable column types. We can also use constraints to go further and reject the data that does not match our guidelines. By doing that, we can have an additional layer of security […]
Troubleshooting a deployed application can be challenging. We can’t use the debugger and stop an application used by other people. Instead, we need to implement logs that we can inspect if we suspect that our API is not working as expected. In this article, we look at the logger built into NestJS and use it […]
Writing tests is crucial when aiming to develop a solid and reliable application. In this article, we explain the idea behind unit tests and write them for our application that works with raw SQL queries. The idea behind unit tests The job of a unit test is to make sure that an individual part of […]
Covering our project with tests can help us ensure that our application works as expected and is reliable. While unit tests play a significant role, they are not enough. Therefore, this article explains the significance of integration tests and implements them in a NestJS project that uses raw SQL queries. The significance of integration tests […]
By default, NestJS uses Express under the hood. Moreover, since Express is very popular, NestJS can choose from a broad set of compatible third-party solutions. A significant advantage of NestJS is that it is framework-independent. Instead of using Express, we can use an adapter using another library with a similar request/response pipeline. The most popular […]
It’s a very common case to need to combine multiple related tables. In SQL, we can do that using a join statement. Therefore, this article explains various types of joins along with real-life examples. Inner joins A few articles ago, we defined the users and posts tables.
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CREATE TABLE users ( id int GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY, email text NOT NULL UNIQUE, name text NOT NULL, password text NOT NULL, address_id int UNIQUE REFERENCES addresses(id) ); CREATE TABLE posts ( id int GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY, title text NOT NULL, post_content text NOT NULL, author_id int REFERENCES users(id) NOT NULL ); |
It’s typical to retrieve a particular post along […]
