使用org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration配置jdbc

要在Spring Boot中使用Hibernate JPA，您可以使用Spring Boot提供的HibernateJpaConfiguration类进行配置。以下是一个简单的示例，演示如何使用Hibernate JPA和Spring Boot配置JDBC连接：

1. 添加Hibernate JPA和MySQL JDBC的依赖项：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

2. 在application.properties文件中添加以下属性：

spring.datasource.url=jdbc:mysql://localhost:3306/db_name
spring.datasource.username=db_username
spring.datasource.password=db_password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

3. 创建一个HibernateJpaConfiguration类，继承自Spring Boot提供的HibernateJpaConfiguration类：

@Configuration
@EnableTransactionManagement
public class MyHibernateJpaConfiguration extends HibernateJpaConfiguration {
    @Autowired
    private DataSource dataSource;

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource);
        em.setPackagesToScan("com.example.demo.entity");

        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);

        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
        em.setJpaProperties(properties);

        return em;
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());

        return transactionManager;
    }
}

4. 确保您的实体类在指定的包中，并且使用@Entity和@Id注释进行注释：

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

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

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

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

    // getters and setters
}

5. 在您的服务类中使用@Autowired注释自动装配EntityManager：

@Service
public class UserService {

    @Autowired
    private EntityManager entityManager;

    @Transactional
    public User save(User user) {
        entityManager.persist(user);
        return user;
    }

    @Transactional(readOnly = true)
    public User findById(Long id) {
        return entityManager.find(User.class, id);
    }

    // other methods
}

这个例子展示了如何使用Hibernate JPA和Spring Boot配置JDBC连接。您可以根据自己的需要进行调整和修改。