hibernate3学习笔记(六) Session管理[Java编程]

请注意,在hibernate中SessionFactory是被计划成线程安全(Thread-safe)的,遗憾的是,Session却线程不安全.

这就意味着:有大概多个线程同享并操作同一个Session从而很简单使数据混乱.

办理的办法以下:（其实hibernate的文档中早已经提过了）

新建HibernateUtil类:

1.import org.apache.commons.logging.Log;
2.import org.apache.commons.logging.LogFactory;
3.import org.hibernate.*;
4.import org.hibernate.cfg.*;
5.
6.public class HibernateUtil {
7.    private static Log log = LogFactory.getLog(HibernateUtil.class);
8.    private static final SessionFactory sessionFactory;
9.
10.    static {
11.        try {
12.            // Create the SessionFactory
13.            sessionFactory = new Configuration().configure()
14.                                                .buildSessionFactory();
15.        } catch (Throwable ex) {
16.            // Make sure you log the exception, as it might be swallowed
17.            log.error("Initial SessionFactory creation failed.", ex);
18.            throw new ExceptionInInitializerError(ex);
19.        }
20.    }
21.
22.    public static final ThreadLocal session = new ThreadLocal();
23.
24.    public static Session currentSession() {
25.        Session s = (Session) session.get();
26.
27.        // Open a new Session, if this Thread has none yet
28.        if (s == null) {
29.            s = sessionFactory.openSession();
30.            session.set(s);
31.        }
32.
33.        return s;
34.    }
35.
36.    public static void closeSession() {
37.        Session s = (Session) session.get();
38.
39.        if (s != null) {
40.            s.close();
41.        }
42.
43.        session.set(null);
44.    }
45.}

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