什么是 Spring 存储库，它有什么作用？

Question

I am new to Java, and have only been programming for about a year, and I am having trouble understanding what exactly "repositories" are in Spring, as well as what exactly they do.

Answer 1

Reposetories is an interface in the springboot which help to create table such as the code below

example i have create an entity

@entity
class student{
@id;
int id ;
}

as we know that the above code makes table in our database named as student but without connect it to the JPA repository we will find an exception and the table will not create to make it functional we have to call it in our repository like the below code

//here you have to import your enttiy as well 

import org.springframework.data.repository.CrudRepository;

public interface BookRepository extends CrudRepository<student, integer>{
}

in the above parameter the student is the name of table and integer is the id type which we have define in our table