c3p0数据库连接池问题-----不能取到连接An attempt by a client to checkout a Connection has timed out(问题还没有解决)
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总结:
1 getCurrentSession创建的session会和绑定到当前线程,而openSession不会。
2 getCurrentSession创建的线程会在事务回滚或事物提交后自动关闭,而openSession必须手动关闭
-----------------------------------------------------------------------获取Session方式的优劣比较:
1.getHibernateTemplate().getSessionFactory().openSession();
3.this.getHibernateTemplate().getSessionFactory().getCurrentSession();从spring管理的sessionFactory中创建一个绑定线程的session.spring会根据该线程的执行情况来自动判断是关闭session还是延迟关闭。这样做可以避免手动的管理实务,同时一个线程最多开启和关闭一次session又可以提高程序的性能。 极力推荐使用这种方法
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getCurrentSession()和openSession()在使用时的区别:
1.采用getCurrentSession()创建的session会绑定到当前线程中,而采用openSession()创建的session则不会
2. 采用getCurrentSession()创建的session在commit或rollback时会自动关闭,而采用openSession()创建的session必须手动关闭
(getCurrentSession()创建的线程会在事务回滚或事物提交后自动关闭,而openSession必须手动关闭)
3.getCurrentSession () 使用当前的session,而openSession() 重新建立一个新的session
在一个应用程序中,如果DAO 层使用Spring 的hibernate 模板,通过Spring 来控制session 的生命周期,则首选getCurrentSession ()。
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使用getCurrentSession()需要在hibernate.cfg.xml文件中加入如下配置:
<property name="hibernate.current_session_context_class">jta</property>
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问题:(以下问题还没有解决)
1.c3p0数据库连接池不能取到连接:An attempt by a client to checkout a Connection has timed out.异常时
根本原因: 池中的连接已经被全部使用完了..达到了最大maxconn...从而导治这个错误...
其他原因:忘记close conn,或者异常了而没有close conn,没有释放conn从池中。。...导治池中的conn满的了...
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