Repository in Spring Framework For Beginners

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Repository in spring is classes use to interact with database, that is simplify as CRUD (create, read, update and delete). To make a class repository, you add a @Repository annotation to the interfaces, but you also need to extends one of spring repository class that is CrudRepository, JpaRepository or PagingAndSortingRepository. And you need to mention your DAO, for example.

@Repository
public interface UserRepository extends JpaRepository<UserDao, Long> {
}

 @Entity
class UserDao{
private Long id;
private String name;
}

Actually that's enough, now you can use your repository anywhere you want, just inject that component, for example to find a user you can use it.


@Controller
@RequestMapping("/user")
public Class UserController{
@Autowired 
private UserRepository userRepository;

 @GetMapping("findAll")
public List<UserDao> allUser(){
return userRepository.findAll();
}
}

The above class is an example on how to get all user expose by endpoint "user/findAll".

I am an experiences web developer, have a good problem-solving and deep understanding of software development principles. With comprehensive skill set in Java, PHP, Python, C and JavaScript. Able to do database thing like MySQL and Oracle. Along with expertise in frameworks like Spring, React, and Firebase. Have a solid understanding of software development methodologies, like Agile and Scrum. I applies best practices to ensure the development process is efficient and of the highest quality output.

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