我正在使用带有数据源连接的 Hibernate 5.0.2.Final(在 Tomcat 8.0.15 上),并开始问自己是否不仅需要关闭 Session,还需要关闭 SessionFactory?
现在它看起来像这样:
public static List<HibernateList> getHibernateList() {
Session session = null;
final String hql = "SELECT H FROM myhibernate.MyHibernate";
try {
SessionFactory factory = HibernateUtil.getSessionFactory();
session = factory.openSession();
session.beginTransaction();
Query query = session.createQuery(hql);
return query.list();
} catch (HibernateException hibex) {
Logger.getLogger(Hibernatepicker.class.getName()).log(Level.INFO, null, hql);
Logger.getLogger(Hibernatepicker.class.getName()).log(Level.SEVERE, null, hibex);
} finally {
try {
if (session != null) {
session.close();
}
} catch (HibernateException hibex) {
}//Nothing I could do...
}
return null;
}
hibernate.cfg.xml 中的一些细节
<property name="hibernate.connection.datasource">java:comp/env/jdbc/sqlserv</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hbm2ddl.auto">auto</property>
<property name="show_sql">false</property>
<property name="hibernate.generate_statistics">true</property>
还有 HibernateUtil:
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
Configuration cfg = new Configuration();
sessionFactory = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
} catch (Throwable ex) {
Logger.getLogger(HibernateUtil.class.getName()).log(Level.SEVERE, null, ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
我不确定是否有必要在 finally 块中调用此方法,而不是仅关闭会话:
public static void disconnect(Session session, SessionFactory factory) {
try {
if (session != null) {
session.close();
} else {
Logger.getLogger(HibernateUtil.class.getName()).log(Level.INFO, null, "Session is Null");
}
} catch (HibernateException | NullPointerException hibex) {
Logger.getLogger(HibernateUtil.class.getName()).log(Level.INFO, null, "Couldn't close session, but there's nothing we can do...");
Logger.getLogger(HibernateUtil.class.getName()).log(Level.SEVERE, null, hibex);
}
try {
if (factory != null) {
factory.close();
} else {
Logger.getLogger(HibernateUtil.class.getName()).log(Level.INFO, null, "Factory is Null");
}
} catch (HibernateException | NullPointerException hibex) {
Logger.getLogger(HibernateUtil.class.getName()).log(Level.INFO, null, "Couldn't close session, but there's nothing we can do...");
Logger.getLogger(HibernateUtil.class.getName()).log(Level.SEVERE, null, hibex);
}
}