Overview In this article, I will delve into the concepts of candidate keys, primary keys, natural keys, and surrogate keys in the context of Hibernate. Candidate Keys A candidate key is a column or a set of columns in a database table that can uniquely identify each row in the table. It means that candidate … Read more
Overview In this post, we are going to explore the reasons why does Hibernate need a no-arg constructor. The no-arg constructor need to be protected or public. A primer on the no-arg constructor When you declare a class without any constructor, the compiler create a default no-arg constructor for you. However, when you define constructor(s) … Read more
Overview There are times you work with legacy databases that store boolean values as strings. Let’s consider this example: Town A conducted a survey to see if their citizens like apples or not. The developer back then created a table like this: For the file like_apple, he planned to store LIKE and DONOT as values … Read more
Let’s consider an example. You have been working on a website selling phones since 2000. In early 2000, there wasn’t any smartphone so you may created an object Phone like this: I’m using lombok (in case you find @Data strange). So, back in 2000s, phones were simple like that. However, with the appearance of smartphone. … Read more