What is @Entity annotation?

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In Spring Boot with JPA (Java Persistence API), the @Entity annotation is used to mark a class as a database entity, meaning it maps to a table in the database. When you annotate a class with @Entity, Hibernate (the default JPA provider in Spring Boot) treats it as a persistent object. Each instance of this class represents a row in the table, and each field maps to a column. For example:

@Entity
public class User {
   @Id
   private Long id;
   private String name;
   private String email;
}

Here, the User class becomes a table, with id, name, and email as columns. The @Id annotation marks the primary key. You can also use additional annotations like @Column, @GeneratedValue, or @Table for more customization. Without @Entity, the class is just a normal Java object and won’t be persisted. In short, @Entity is the bridge between Java classes and database tables, enabling ORM (Object Relational Mapping). It simplifies database operations by letting developers work with objects instead of raw SQL queries.

What is the use of @RequestMapping?

How do you connect a database in Spring Boot?

What is the use of @PathVariable and @RequestParam?

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