Java 使用spring数据jpa在启动时将数据保存到db

我想在SpringBoot应用程序启动时将一些实体数据添加到db中。我正在使用SpringDataJPA存储库将数据保存到db。我尝试过对方法使用

@PostConstruct

注释和

ApplicationListener

接口等，但没有成功。这两种情况下都会执行代码，但它不会将任何数据写入数据库。我怎样才能做到呢

代码：

@Component
public class DatabaseFillerOnStartup implements ApplicationListener {

    @Autowired
    private UserRepository userRepository;

    private static Logger logger = LoggerFactory.getLogger(DatabaseFillerOnStartup.class);

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        logger.info("===================================" +event.toString());
        User user = new User("test");
        user.setFirstName("test");
        user.setLastName("test");
        user.setEmail("test@test.com");
        user.setContactNumber("1234567890");
        userRepository.save(user);
    }

}

@Configuration
@EnableTransactionManagement
@ComponentScan("com.furniturepool.bll.config" )
@PropertySource(value = "classpath:application.properties" )
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan("domain.package" );
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        dataSource.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        dataSource.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        dataSource.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        return properties;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }
}

interface UserRepository extends CrudRepository<User, Long> {
}

配置：

@Component
public class DatabaseFillerOnStartup implements ApplicationListener {

    @Autowired
    private UserRepository userRepository;

    private static Logger logger = LoggerFactory.getLogger(DatabaseFillerOnStartup.class);

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        logger.info("===================================" +event.toString());
        User user = new User("test");
        user.setFirstName("test");
        user.setLastName("test");
        user.setEmail("test@test.com");
        user.setContactNumber("1234567890");
        userRepository.save(user);
    }

}

@Configuration
@EnableTransactionManagement
@ComponentScan("com.furniturepool.bll.config" )
@PropertySource(value = "classpath:application.properties" )
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan("domain.package" );
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        dataSource.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        dataSource.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        dataSource.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        return properties;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }
}

interface UserRepository extends CrudRepository<User, Long> {
}

存储库：

@Component
public class DatabaseFillerOnStartup implements ApplicationListener {

    @Autowired
    private UserRepository userRepository;

    private static Logger logger = LoggerFactory.getLogger(DatabaseFillerOnStartup.class);

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        logger.info("===================================" +event.toString());
        User user = new User("test");
        user.setFirstName("test");
        user.setLastName("test");
        user.setEmail("test@test.com");
        user.setContactNumber("1234567890");
        userRepository.save(user);
    }

}

@Configuration
@EnableTransactionManagement
@ComponentScan("com.furniturepool.bll.config" )
@PropertySource(value = "classpath:application.properties" )
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan("domain.package" );
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name"));
        dataSource.setUrl(environment.getRequiredProperty("spring.datasource.url"));
        dataSource.setUsername(environment.getRequiredProperty("spring.datasource.username"));
        dataSource.setPassword(environment.getRequiredProperty("spring.datasource.password"));
        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        return properties;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }
}

interface UserRepository extends CrudRepository<User, Long> {
}

interface UserRepository扩展了crudepository{
}

确保您已经提交了事务？

---

或者将您的“userrepository”代码和spring数据jpa xml配置放在这里。

在不使用任何其他配置的情况下，我创建了一个示例应用程序，它使用H2数据库作为存储，并使用JpaRepository存储和检索用户

只需运行我添加的测试

Mysql数据库的配置示例：

spring:
  jpa:
    show-sql: true
    hibernate:
      naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
      dialect: org.hibernate.dialect.MySQL5Dialect
      ddl-auto: create-drop
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/testdb?createDatabaseIfNotExist=true
    test-on-borrow: true
    validation-query: SELECT 1
    username: xxx
    password: xxx

记住将MySQL添加到类路径中

希望这有帮助

---

Justin

我发现使用Hibernate时，最好将日志级别设置得尽可能高（尽管调试很可能会这样做），并彻底研究输出。日志中经常出现错误或提示下一步要尝试什么。@JLove:让我用debug检查一下mode@JLove：我可以从数据库读取数据。。。但储蓄不起作用。。。。它只是返回对象本身，没有抛出任何类型的错误。请发布您的存储库代码以及Hibernate配置代码。@JLove:好的，几分钟后我会发布谢谢您的帮助：），但是我可以使用测试代码将数据创建到生产机器吗？@PranavCBalan这是生产就绪代码，我刚刚将其创建为Junit测试，因此不需要设置应用程序的其余部分。请注意我在上面关于数据源的评论，如果它解决了您的问题，也将标记为答案。我需要将该数据写入生产server@PranavCBalan：Ok，因此在application.yaml中，将H2内存数据库的配置交换为基于磁盘的数据库。我认为这与您是否能够从存储库中正确存储和检索是一个独立的问题。我已经在回答中添加了可用于MySQL db的配置。实体的生命周期由存储库处理，而无需明确定义事务，事务的边界将是存储库上的每个方法调用。你不需要承诺。