java - 即使没有可用的 SessionFactory 实例，Spring @Autowired 如何绑定(bind) SessionFactory 对象

Question

我在基于 Java 的配置中使用 Hibernate 和 Spring。我的配置文件是这个:

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

@Bean
public LocalSessionFactoryBean sessionFactory() {
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(dataSource());
    sessionFactory.setPackagesToScan(new String[] { "dto" });
    sessionFactory.setHibernateProperties(hibernateProperties());
    return sessionFactory;
 }

工作正常。这没问题，但是当我手动尝试为 trasactionManager 设置 sessionfactory 参数时，如下所示:

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

IDE 正在显示:

`The method setSessionFactory(SessionFactory) in the type HibernateTransactionManager is not applicable for the arguments (LocalSessionFactoryBean)`

所以，我创建了一个如下所示的 sessionFactory

@Bean
@Autowired
public SessionFactory sessionFactory(DataSource dataSource) {
    LocalSessionFactoryBuilder sessionFactory = new LocalSessionFactoryBuilder(dataSource);
    sessionFactory.addProperties(hibernateProperties());
    sessionFactory.scanPackages("dto");
    return sessionFactory.buildSessionFactory();

}

并传递给 trasactionManager 它起作用了。

我的问题是，即使在第一种方法中不存在 sessionFactory 实例，spring 如何 Autowiring sessionFactory 对象？

Answer 1

您需要将方法返回类型从 SessionFactory 更改为 HibernateTransactionManager。

它应该是这样的:

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

@Bean
public SessionFactory sessionFactory() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.show_sql", "true")
    properties.setProperty("hibernate.cache.region.factory_class", "org.hibernate.cache.ehcache.EhCacheRegionFactory")
    properties.setProperty("hibernate.cache.use_query_cache", "true")
    properties.setProperty("hibernate.cache.use_second_level_cache", "true")
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.HSQLDialect")

    return new LocalSessionFactoryBuilder(dataSource())
        .scanPackages("dto")
        .addProperties(properties)
        .buildSessionFactory();
}