springboot jpa hibernate 配置实例

这里提供一个简单的 Spring Boot + JPA + Hibernate 配置实例，步骤如下：

1. 在 `pom.xml` 中添加以下依赖：

<!-- Spring Boot Starter -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

<!-- Spring Boot Starter Data JPA -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<!-- Hibernate Entity Manager -->
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>5.4.32.Final</version>
</dependency>

<!-- MySQL Connector -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.26</version>
</dependency>

2. 在 `application.properties` 中配置数据源和 JPA 相关属性：

# 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456

# JPA 配置
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect

3. 创建实体类，例如：

@Entity
@Table(name = "user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "age")
    private Integer age;

    // 省略 getter 和 setter
}

4. 创建 Repository 接口，例如：

public interface UserRepository extends JpaRepository<User, Long> {

    List<User> findByName(String name);
}

5. 创建 Service 类，例如：

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public List<User> findByName(String name) {
        return userRepository.findByName(name);
    }

    public User save(User user) {
        return userRepository.save(user);
    }

    public void deleteById(Long id) {
        userRepository.deleteById(id);
    }
}

6. 创建 Controller 类，例如：

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/{name}")
    public List<User> findByName(@PathVariable("name") String name) {
        return userService.findByName(name);
    }

    @PostMapping
    public User save(@RequestBody User user) {
        return userService.save(user);
    }

    @DeleteMapping("/{id}")
    public void deleteById(@PathVariable("id") Long id) {
        userService.deleteById(id);
    }
}

这样就完成了 Spring Boot + JPA + Hibernate 的配置和使用。