Link Nuis

Introduction​

The SQL LIKE operator is used in a WHERE clause to search for a specified pattern in a cloumn. The performance and behavior of the LIKE operator in SQL change significantly when used alongside indexes.

Introduction​

In the world of Spring Boot development, security is often treated like an onion - multiple layers protecting the core data. But with acronyms like AES, RSA, SHA, and HMAC, it's easy to get confused.

Introduction​

In the world of Java Web APIs, data is king. But how we talk to that data has undergone a massive transformation over the past two decades. We've moved from manual SQL plumbing to high-level abstractions that feel like magic.

The Journey:

• 1997: JDBC 1.0 - The foundation
• 2001: Hibernate 1.0 - ORM revolution begins
• 2002: Spring JDBC release as a part of Spring 1.0 (2004)
• 2006: JPA 1.0 - Standardizing ORM (inspired by Hibernate)
• 2011: Spring Data JPA - Repository abstraction

Today, we're peeling back the curtain to see how these layers actually work and when to use each one.

Introduction​

In modern backend systems, authentication and authorization are commonly implemented using JWT (JSON Web Token). However, using JWT incorrectly can introduce serious security risks.

@Autowired Annotation​

• Purpose: Tells Spring to automatically inject a dependency into a field, setter, or constructor.

Introduction​

In modern applications, logging is essential for debugging, monitoring, and auditing. But adding logging statements manually in every method quickly becomes repetive and messy. This is where Aspect-Oriented Programming (AOP) comes in. With Spring AOP, you can separete corss-cutting concerns like logging, security, and transactions from your core business logic.

Introduction​

Imagine planting a seed in your garden. You don't just throw it in the soil and expect magic. You prepare the ground, water it, nuture it, watch it grow, and eventually remove it when its purpose is fullfilled. Surprisingly, Spring works in a very similar way. Every object that Spring manages goes through its own controlled journey from creation to destruction. This is called the Spring Bean lifecycle.

The Spring Bean Life Cycle describes the sequence of steps a bean goes through from its creation to destruction within the Spring IoC (Inversion of Control) container.

Introduction​

Data validation is one of those topics that every backend developer knows is important-but it often doesn't get the attention it deserves. A solid validation strategy keeps your APIs clean, secure, and predictable.

Manual and automatic transaction management​

Imagine you need custom logic to work with your database, such as managing transactions, but Spring Data JPA repositories are insufficient for you. So what could you do? Spring Data JPA offers various approaches to achieve this.