java Hibernate不会在选择之前刷新持久性上下文

Question

我正在尝试使用spring事务支持用户休眠。我已经将会话工厂配置为bean（见下文），并创建了一个DAO类。我还使用spring测试支持——运行带有@Transactional注释的测试类，据我所知，这应该允许我在一个事务中调用多个dao操作。我读到hibernate应该在提交之后或在执行select之前刷新其持久性上下文。我对后者抱有希望。但是我的大多数测试都失败了，因为（根据日志）hibernate在插入之后和选择之前没有刷新它的持久性上下文

以下是弹簧配置的弹簧部分：

@Configuration
@PropertySource("/db.properties")
@EnableTransactionManagement
@ComponentScan(basePackages = "repository")
public class DataAccessConfiguration {

 @Bean
    public SessionFactory sessionFactory() throws IOException {
        LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
        sessionFactoryBean.setDataSource(pool());
        sessionFactoryBean.setPackagesToScan("domain");
        sessionFactoryBean.setHibernateProperties(hibernateProperties());
        sessionFactoryBean.afterPropertiesSet();
        return sessionFactoryBean.getObject();
    }

    private Properties hibernateProperties() {
        Properties hibernateProp = new Properties();
        hibernateProp.put("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
        hibernateProp.put("hibernate.format_sql", true);
        hibernateProp.put("hibernate.use_sql_comments", true);
        hibernateProp.put("hibernate.show_sql", true);
        hibernateProp.put("hibernate.max_fetch_depth", 3);
        hibernateProp.put("hibernate.jdbc.batch_size", 10);
        hibernateProp.put("hibernate.jdbc.fetch_size", 50);
        hibernateProp.put("hibernate.hbm2ddl.auto", "update");
        return hibernateProp;
    }

    @Bean
    @Profile("hibernate")
    public PlatformTransactionManager transactionManager() throws IOException {
        HibernateTransactionManager manager = new HibernateTransactionManager(sessionFactory());
        manager.setDataSource(pool());

        return manager;
    }

    @Bean
    @Profile("jdbc")
    PlatformTransactionManager jdbcTransactionManager(){
        DataSourceTransactionManager manager = new DataSourceTransactionManager();
        manager.setDataSource(pool());

        return manager;
    }
}

我使用两个平台事务管理器——一个用于jdbc，另一个用于hibernate。我尝试删除jdbc管理器，只留下hibernate（不起作用）

以下是dao类：

@Repository
@Profile("hibernate")
public class UserDaoHibernate implements UserDao {

    private final SessionFactory sessionFactory;

    public UserDaoHibernate(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public void insert(User user) {
        sessionFactory.getCurrentSession().save(user);
    }

    @Override
    public void addRole(User user, Role role) {
        NativeQuery addRoleQuery = sessionFactory.getCurrentSession()
                .createNativeQuery("INSERT INTO roles(user_name, user_role) VALUES(:user_name,:user_role)");
        addRoleQuery.setParameter("user_name",user.getUsername());
        addRoleQuery.setParameter("user_role", role.toString().toUpperCase());
        addRoleQuery.executeUpdate();
    }

    @Override
    public boolean hasRole(User user, Role role) {
        NativeQuery hasRoleQuery = sessionFactory.getCurrentSession()
                .createSQLQuery("SELECT * FROM roles WHERE user_name = :user_name AND user_role = :user_role");
        hasRoleQuery.setParameter("user_name", user.getUsername());
        hasRoleQuery.setParameter("user_role", role.toString().toUpperCase());
        return hasRoleQuery.getResultList().size() == 1;
    }

}

测试类失败的测试代码如下：

@ContextConfiguration(classes = {DataAccessConfiguration.class})
@Rollback
@ExtendWith(SpringExtension.class)
@ActiveProfiles("hibernate")
@Transactional
public class UserDaoTest {

    @Autowired
    private UserDao sut;

    private User user = new User("NEW_USERNAME123", "NEW_PASSWORD123", LocalDate.now().minusYears(20),
            "FIRST_NAME", "LAST_NAME");

    @Test
    public void shouldAddNewRoleToUser(){
        sut.insert(user);
        assertFalse(sut.hasRole(user,Role.MEMBER));

        sut.addRole(user, Role.MEMBER);

        assertTrue(sut.hasRole(user,Role.MEMBER));
    }

}

下面是我在运行测试方法后得到的输出（不包括事务注释）：

Hibernate: 
    select
        nextval ('USER_ID_SEQUENCE')
Hibernate: 
    /* dynamic native SQL query */ SELECT
        * 
    FROM
        roles 
    WHERE
        user_name = ? 
        AND user_role = ?
Hibernate: 
    /* dynamic native SQL query */ INSERT 
    INTO
        roles
        (user_name, user_role) 
    VALUES
        (?,?)
Nov 13, 2019 3:05:31 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 0, SQLState: 23503
Nov 13, 2019 3:05:31 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: ERROR: insert or update on table "roles" violates foreign key constraint "fk_roles_user_id"
  Detail: Key (user_name)=(NEW_USERNAME123) is not present in table "users_table".

当我以编程方式提交会话时 会话工厂。getCurrentSession（）。getTransaction（）。提交（）；在插入结束时，一切正常

Answer 1

到目前为止，关于我的问题，我唯一发现的是这里How does AUTO flush strategy works

显然，自动刷新模式不能保证在每次查询之前刷新（至少在hibernate自己的API中是这样）。我不能百分之百确定这是否是我的情况，我会努力找出答案

Answer 2

尝试使insert方法@Transactional或使用sessionFactory。getCurrentSession（）。刷新（）

Answer 3

您应该使用@Transactional注释“shouldAddNewRoleToUser（）”方法，并检查是否在应用程序中为事务配置了spring会话上下文