Spring Data JPA CRUD Example
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Spring Data JPA Interview Questions
User Entity
package userservice.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class User {
@Id
@GeneratedValue
private long id;
private String name;
public long getId(){
return this.id;
}
public String getName(){
return this.name;
}
public void setName(String name){
this.name = name;
}
}
User Repository
package userservice.repository;
import userservice.model.User;
import org.springframework.data.repository.CrudRepository;
public interface UserRepository extends CrudRepository {
}
CRUD Examples
package userservice;
import userservice.model.User;
import userservice.repository.UserRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Application {
private static final Logger log =
LoggerFactory.getLogger(Application.class);
public static void main(String[] args){
SpringApplication.run(Application.class, args);
}
@Bean
public CommandLineRunner demo(UserRepository repo) {
return (args) -> {
//CREATE
User user = new User();
repo.save(user);
//READ
User savedUser = repo.findById(user.getId()).get();
//UPDATE
savedUser.setName("Ted");
repo.save(savedUser);
//DELETE
repo.delete(savedUser);
};
}
}
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