Spring Boot 扩展 CrudRepository

使用Spring Boot扩展CrudRepository进行数据访问

java
@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String email;
    // 省略其他属性和方法
}
public interface UserRepository extends CrudRepository {
}
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    public User saveUser(User user) {
        return userRepository.save(user);
    }
    public User getUserById(Long id) {
        Optional optionalUser = userRepository.findById(id);
        return optionalUser.orElse(null);
    }
    public void deleteUser(Long id) {
        userRepository.deleteById(id);
    }
    // 省略其他方法
}
@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;
    @PostMapping
    public User createUser(@RequestBody User user) {
        return userService.saveUser(user);
    }
    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.getUserById(id);
    }
    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable Long id) {
        userService.deleteUser(id);
    }
    // 省略其他方法
}