【SpringBoot整合JPA框架（hibernate实现）详解】（附详细代码）

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
 
// 定义一个用户实体类
@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    // 省略其他字段、构造函数、getter和setter方法
}
 
// 定义一个UserRepository接口继承JpaRepository
public interface UserRepository extends JpaRepository<User, Long> {
    // 这里可以定义一些自定义查询方法，Spring Data JPA会自动生成实现
}
 
// 定义一个服务类
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
 
    public List<User> findAllUsers() {
        return userRepository.findAll();
    }
    // 省略其他业务方法
}
 
// 定义一个控制器类
@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;
 
    @GetMapping
    public ResponseEntity<List<User>> getAllUsers() {
        List<User> users = userService.findAllUsers();
        if (users.isEmpty()) {
            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
        }
        return new ResponseEntity<>(users, HttpStatus.OK);
    }
    // 省略其他控制器方法
}
 
// 配置类
@Configuration
public class DatabaseConfig {
    @Bean
    public EntityManagerFactory entityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);
        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("com.example.demo.model");
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        return factory.getObject();
    }
 
    @Bean
    public PlatformTransactionManager transactionManager(EntityManagerFactory factory) {
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(factory);
        return t