sessionfactory

关于hibernate的一些事 （此博文为 http://my.oschina.net/u/555061/blog/506216 后续 ） 1.简单说一下SessionFactory、Session 源自： http://blog.csdn.net/javaloveiphone/article/details/8155340 1.1、Hibernate中SessionFactory对象的创建代价很高，它是线程安全的对象，被设计成可以为所有的应用程序线程所共享。通常，SessionFactory会在应用程序启动时创建， 一旦创建了SessionFactory将不会轻易关闭，只有当应用关闭时，SessionFactory才会关闭 。 1.2、而Session的对象是轻量级的，它是线程不安全的。对于单个业务进程单个工作单元而言，Session只被使用一次。 创建Session时，并不会立即打开与数据库之间的连接，Session只在需要进行数据库操作时，才会获取JDBC连接 。因此，打开和关闭Session，并不会对性能造成很大的影响。甚至即使无法确定一个请求是否需要数据访问，也可以打开Session对象，因为如果不进行数据库访问，Session不会获取JDBC连接。 使用Spring管理hibernate的事务，在每个dao操作中使用SessionFactory

I have a question. I tried to run my web application using Spring and Hibernate/ I have a strange error. NoSuchBeanDefinitionException. Stacktrace is: Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.SessionFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException

How do you create a SessionFactory using the java config? @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. Worth noting here that Spring 3.1 introduces LocalSessionFactoryBuilder, which is expressly designed for use within @Bean methods. http://static.springsource.org/spring/docs/3.1.0.RC1/javadoc-api/org/springframework/orm

For a web application, it seems like a good way to handle the session is to use the setting <property name="current_session_context_class">managed_web</property> , call CurrentSessionContext.Bind/Unbind on Begin/EndRequest. Then I can just use sessionFactory.GetCurrentSession() in the repository class. This works fine for all page request. But I have background workers doing stuff and using the same repository classes to do stuff. These do not run within a web request, so that session handling won't work. Any suggestions to how this can be solved? I solved it by creating my own session context

In my application, I have a module that is designed to search a database for users and display their information in a table inside a jsp. I just setup Spring Security inside my application. I was able to make a connection to the database from the login page, though for some reason none of my DAO's CRUD operations (in this case, the search) are working. Thanks, and please let me know if I can provide any more information. Here is most of my stack trace. org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction

I'm trying to create sessionFactory bean using spring 3.2 and hibernate 4. I used the following code for that. But the problem is buildSessionFactory() is deprecated and the buildSessionFactory(ServiceRegistry serviceRegistry) is suggested to use instead in javadoc. However, I'm not being able to understand what is ServiceRegistry and how to use buildSessionFactory(ServiceRegistry serviceRegistry) . @Configuration public class AppConfig { ... @Bean public SessionFactory sessionFactory() { return new LocalSessionFactoryBuilder(dataSource()) .scanPackages("com.mypackages") .addProperties

Using Spring + Hibernate and transactional annotations. I'm trying to test the following: call a method that changes a User object then calls a @Transactional service method to persist it read the object back from the DB and insure it's values are correct after the method The first problem I had was reading the User object in step 2 just returned the one in the Hibernate level 1 cache and did not actually read from the database. I therefore manually evicted the object from the cache using the Session to force a read from the database. However, when I do this, the object values are never