springboot基本使用十（搭建jpa）

package com.jpa.controller; // import com.jpa.entity.User; import com.jpa.repository.UserRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; import java.util.Optional; /** * ClassName: UserController * Package:com.jpa.controller * Description: * 后端jpa框架，底层是hibernate，（ORM技术）对象关系映射 * * * @Date:2024/5/13 15:11 * @Author: twx */ @RestController @RequestMapping("/user") public class UserController { @Autowired // private UserRepository userRepository; @GetMapping("/findById") public User findById(int id){ User user = userRepository.findById(id).get(); return user; } @GetMapping("/findAll") public List<User> findAll(){ List<User> list = userRepository.findAll(); return list; } @GetMapping("/findByName") public User findByName(String name){ User byName = userRepository.findByName(name); return byName; } }