需要在 hibernate.cfg.xml 中添加的配置
[java] view plain copy print ? <property name=“hibernate.current_session_context_class”>thread</property> <property name="hibernate.current_session_context_class">thread</property>创建类 HibernateUtil.java实现单例模式的SessionFactory。
[java] view plain copy print ? import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil { private static final Configuration config; private static final SessionFactory factory; static { // 静态初始化块，加载配置信息 config = new Configuration().configure(); // 读取文件 factory = config.buildSessionFactory(); } public static Session getSessionFactory(){ return factory; } } import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil { private static final Configuration config; private static final SessionFactory factory; static { // 静态初始化块，加载配置信息 config = new Configuration().configure(); // 读取文件 factory = config.buildSessionFactory(); } public static Session getSessionFactory(){ return factory; } }实现了session对象只被创建一次，避免了多次加载sessionfactory的负担。
[java] view plain copy print ? import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; public class Test { @Test public void select(){ Session session = HibernateUtils.getSession(); Transaction t = session.beginTransaction(); } } import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; public class Test { @Test public void select(){ Session session = HibernateUtils.getSession(); Transaction t = session.beginTransaction(); } }在测试类中去调用静态代码块类就可以进行操作了。
使用getCurrentSession()获得session
[java] view plain copy print ? import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import demo.entity.User; public class Test { public static void main(String[] args) { SessionFactory factory = HibernateUtil.getSessionFactory(); //getCurrentSession()生成的Session不需要手动关闭，会在事务提交后自动关闭。 Session session = factory.getCurrentSession(); User user = new User(); user.setUsername(”qqqqq”); user.setPassword(”qqqqq”); user.setNickname(”name1”); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(user); //session.delete(user);//删除操作 //User tmp = session.find(User.class, 1);//查找操作 //session.update(user);//更新操作 transaction.commit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); } e.printStackTrace(); } } } import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import demo.entity.User; public class Test { public static void main(String[] args) { SessionFactory factory = HibernateUtil.getSessionFactory(); //getCurrentSession()生成的Session不需要手动关闭，会在事务提交后自动关闭。 Session session = factory.getCurrentSession(); User user = new User(); user.setUsername("qqqqq"); user.setPassword("qqqqq"); user.setNickname("name1"); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(user); //session.delete(user);//删除操作 //User tmp = session.find(User.class, 1);//查找操作 //session.update(user);//更新操作 transaction.commit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); } e.printStackTrace(); } } }