Core Components of Spring Boot Applications Let’s explore the main components and their roles involved in developing Spring Boot applications: 1. Entity An object that maps to a database table. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 @Entity @Table(name = "users") public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(nullable = false) private String username; @Column(nullable = false) private String email; // getter, setter, constructor } 2. Repository An interface that handles database operations. ...

An Entity Relationship Diagram (ERD) is a graphical representation of the structure of a database. ERDs show the relationships between tables in a database, making it easier to understand the design and structure of the database. Components of an ERD An ERD is made up of the following components: Entities Attributes Relationships Entities An entity represents an object that you want to manage in your database. For example, a student, a professor, or a course could all be entities. ...

The HTTP protocol is a communication protocol for transmitting data between a client and a server. The HTTP protocol consists of requests and responses, and the methods used in requests and responses are called HTTP methods. HTTP Methods An HTTP method is a method used by a client to send a request to a server. There are various methods depending on the type of request. GET POST PUT PATCH DELETE HEAD OPTIONS CONNECT TRACE GET The GET method is used to retrieve a specific resource. This method is used to query data from the server and returns the resource as a response to the request without modifying the data. ...

What is Spring? Spring is a framework based on the Java language that provides various features for developing enterprise-grade applications. Spring has the following characteristics: Lightweight container: Spring is a lightweight container that manages the creation of objects, their lifecycle, and dependency management. Inversion of Control (IoC): Spring supports Inversion of Control, which allows the Spring container to manage the creation, lifecycle, and dependency management of objects. Dependency Injection (DI): Spring supports Dependency Injection, which allows the Spring container to manage the dependencies between objects. ...

Differences between call by value and call by reference There are call by value and call by reference methods when passing arguments to a function. Let’s learn the differences between the two methods. Call by value A method that passes only the value when passing an argument to a function Even if the value of the argument is changed within the function, the value of the calling side is not changed. Usually used when passing a variable 1 2 3 4 5 6 7 8 9 10 11 12 13 14 #include <stdio.h> void swap(int a, int b) { int temp = a; a = b; b = temp; } int main() { int a = 10, b = 20; swap(a, b); printf("a: %d, b: %d", a, b); return 0; } Execution result: ...