Spring Hibernate SessionFactory
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Spring Hibernate SessionFactory
提问by DD.
How do you create a SessionFactory using the java config?
如何使用 java 配置创建 SessionFactory？
@Bean
public SessionFactory sessionFactory(){
AnnotationSessionFactoryBean sessionFactoryBean = new AnnotationSessionFactoryBean();
sessionFactoryBean.setConfigLocation(new ClassPathResource("hibernate.cfg.xml"));
return sessionFactoryBean.getObject();
}
This doesnt work for some reason...it always returns null.
由于某种原因，这不起作用......它总是返回空值。
采纳答案by Chris Beams
Worth noting here that Spring 3.1 introduces LocalSessionFactoryBuilder, which is expressly designed for use within @Bean methods.
值得注意的是，Spring 3.1 引入了 LocalSessionFactoryBuilder，它是专门为在 @Bean 方法中使用而设计的。
This gets around the awkward need to deal with FactoryBeans, getObject() methods, etc. FactoryBeans are excellent for use in XML, but non-ideal in @Bean methods.
这绕过了处理 FactoryBeans、getObject() 方法等的尴尬需求。FactoryBeans 非常适合在 XML 中使用，但在 @Bean 方法中并不理想。
Note that this new builder is Hibernate 4.1+ only.
请注意，这个新构建器仅适用于 Hibernate 4.1+。
回答by Tomasz Nurkiewicz
Return factory instead:
改为返厂：
@Bean
public AbstractSessionFactoryBean sessionFactoryBean(){
AnnotationSessionFactoryBean sessionFactoryBean = new AnnotationSessionFactoryBean();
sessionFactoryBean.setConfigLocation(new ClassPathResource("hibernate.cfg.xml"));
return sessionFactoryBean;
}
If you need to inject SessionFactorydirectly somewhere in code, add this helper method:
如果您需要SessionFactory直接在代码中的某处注入，请添加此辅助方法：
public SessionFactory sessionFactory() {
return sessionFactoryBean().getObject();
}
Note that the helper sessionFactory()is notannotated with @Bean- this is really important.
请注意，助手sessionFactory()是不带注释@Bean-这是非常重要的。
回答by danny.lesnik
Tomasz is right, but I do believe that creating object instance using "new" does not feet with Spring concept:
Tomasz 是对的，但我确实相信使用“new”创建对象实例不符合 Spring 概念：
I think you need to do it this way:
我认为你需要这样做：
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="annotatedClasses">
<list>
<value>com.vanilla.objects.Student</value>
<value>com.vanilla.objects.Address</value>
</list>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
and then you can use it inside your Spring bean:
然后你可以在你的 Spring bean 中使用它：
@Autowired
SessionFactory sessionFactory;
and then inside of your method:
然后在你的方法里面：
Session session = sessionFactory.getCurrentSession();
回答by phil294
Since the above answers are outdated, here's a more modern approach:
由于上述答案已经过时，这里有一个更现代的方法：
@Bean
public SessionFactory sessionFactory(HibernateEntityManagerFactory hemf){
return hemf.getSessionFactory();
}
Also, if you've injected an EntityManager, you can get the current session via
此外，如果您注入了EntityManager，则可以通过以下方式获取当前会话
Session session = entityManager.unwrap(Session.class);
回答by Josh
You should call afterPropertiesSet() on the session factory after setting all the properties
设置所有属性后，您应该在会话工厂上调用 afterPropertiesSet()
So in your example it would look like:
所以在你的例子中它看起来像：
@Bean
public SessionFactory sessionFactory(){
AnnotationSessionFactoryBean sessionFactoryBean = new AnnotationSessionFactoryBean();
sessionFactoryBean.setConfigLocation(new ClassPathResource("hibernate.cfg.xml"));
sessionFactoryBean.afterPropertiesSet();
return sessionFactoryBean.getObject();
}
