Question

我通过hibernate连接一个MYSQL数据库，我似乎有一些进程在会话结束后没有被杀死。我已经在每个会话上调用了flush和close但是当我检查服务器时，最后一个进程仍然在那里使用sleep命令。这是我遇到的一个新问题，昨天并非如此。当我完成一个会话时，有什么方法可以确保杀死这些进程。下面是我的一个班级的例子。

    public JSONObject check()
{
    //creates a new session needed to add elements to a database
    Session session = null;

    //holds the result of the check in the database
    JSONObject check = new JSONObject();
    try{
        //creates a new session needed to add elements to a database
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); 
        session = sessionFactory.openSession();


        if (justusername){

            //query created to select a username from user table
            String hquery = "Select username from User user Where username = ? ";

            //query created
            Query query = session.createQuery(hquery);

            //sets the username of the query the values JSONObject contents
            query.setString(0, username);

            // executes query and adds username string variable 
            String user = (String) query.uniqueResult();

            //checks to see if result is found (null if not found)
            if (user == null)
            {
                //adds false to Jobject if not found
                check.put("indatabase", "false");
            }
            else
            {
                check.put("indatabase", "true");
            }

            //adds check to Jobject to say just to check username
            check.put("justusername", true);

        }
        else
        {
            //query created to select a username and password from user table
            String hquery = "Select username from User user Where username = :user and password = :pass ";
            Query query = session.createQuery(hquery);

            query.setString("user", username);
            query.setString("pass", password);

            String user = (String) query.uniqueResult();

            if(user ==null)
            {
                check.put("indatabase", false);
            }
            else
            {
                check.put("indatabase", true);
            }

            check.put("justusername", false);

        }


        }catch(Exception e){

        System.out.println(e.getMessage());
            //logg.log(Level.WARNING, " Exception", e.getMessage());

    }finally{
    // Actual contact insertion will happen at this step

        session.flush();
        session.close();

    }
    //returns Jobject
    return check;
}

Answer 1

您最后应调用sessionFactory.close()，这将释放连接池中的所有连接。

请注意，通常您应该为整个应用程序创建一个会话工厂，然后可以根据需要创建任意数量的会话。创建会话工厂非常昂贵。

杀死处于睡眠命令的Mysql进程

1 个答案: